Abstract:
Described herein is a diagnostic chewing gum for identifying the presence of pathogens detectable via the mouth, in particular pathogens residing in nasal, oropharyngeal, laryngeal, oesophageal, ocular and/or pulmonal tissue of a user, more particularly pathogens selected from among a virus, bacterium, protozoa, prion, fungus or a combination thereof. The inventive diagnostic chewing gum includes a base material or particles ( 3 ) embedded and/or attached to the base material and an element ( 1, 5 - 7 ), like e.g. a releasable flavor molecule, attached to the base material and/or the particles, for the generation of a change in the chewing gum directly detectable by the user, wherein the element ( 1, 5 - 7 ) generates the change upon direct or indirect contact with a marker ( 4 ) which is released by the pathogens, or, in case of a virus or prion, by the cellular structure hosting it.

Description:
PRIORITY 
     This application corresponds to the national phase of International Application No. PCT/EP2013/054715, filed Mar. 8, 2013, which, in turn, claims priority to Swiss Patent Application No. 00328/12 filed Mar. 8, 2012, both of which are incorporated by reference herein in their entirety. 
     SEQUENCE LISTING 
     The instant application contains a Sequence Listing that has been submitted in ASCII format via EFS-Web and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Sep. 8, 2014, is named LNK_154_SequenceListing.txt and is 27,912 bytes in size. 
     TECHNICAL FIELD 
     The present invention relates to device, in particular to a chewing gum, for the diagnosis of pathogens present in the mouth cavity and adjacent tissues. 
     PRIOR ART 
     Many pathogens colonize the mouth cavity and adjacent tissues, including the stomach, the lung, nasopharynx and others. Currently, the identification of these pathogens is complex and requires advanced instrumentation which is typically located in specialized centers in which a precise analysis is performed on biopsies or fluid samples collected from the patient. The systems include immunological or histological methods. Consequently, such systems are unable to be used for screening purposes within which an immediate answer must be provided. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a new approach for the detection of pathogens in the mouth and adjacent tissues. 
     This and other objects are achieved by the claimed subject matter. 
     Specifically the present invention in particular relates to a diagnostic chewing gum for identifying the presence of pathogens detectable via the mouth, in particular present in the mouth cavity, respiratory ducts and entire lung, oesophagus, stomach, nasopharynx, oropharynx, or laryngopharyns of a user. In accordance with the present invention, this chewing gum comprises at least one base material or particles embedded and/or attached to said base material; at least one element, such as for example a molecule, for the generation of a change in the chewing gum directly detectable (i.e. without additional analytical tools or the like so basically by using at least one of the five senses, i.e. sight—ophthalmoception, hearing—audioception, taste—gustaoception, smell—olfacoception, and touch—tactioception, or a combination thereof) by the user. Said pathogen is selected from the group consisting of virus, bacterium, protozoa, prion, fungus or a combination thereof. Furthermore said element generates the change upon direct or indirect contact with a marker which is released by said pathogens, or, in case of a virus or prion, by the cellular structure hosting it. Generally speaking such a pathogen can e.g. be a protease from DNA or RNA of non-mammalian, or more precisely normally non-human origin. The invention does not relate to the detection of markers which are released by inflammatory tissue in response to bacterial mediators in dental applications, specifically not to proteases from DNA or RNA of mammalian, or more precisely normally human origin. 
     Surprisingly it was found that pathogenic biomarkers of pathogens present in the mouth cavity, respiratory ducts and entire lung, oesophagus, stomach, nasopharynx, oropharynx, or laryngopharynx are present in sufficient amounts in the mouth cavity to allow for such a pathogen detection system. 
     The proposed systems here allow for patient self-monitoring. The chain in this proposal is as follows: In response to pathogen presence, (i) a change for example in the form of a strong bitter taste is released by the system and (ii) this bitter taste can be reported by the patient. (iii) Based on this report, a diagnose can be made and (iv) can lead early on therapy if appropriate. 
     As pointed out above, detection of pathogens meets a true threat in today&#39;s advancement of oral and general health. The proposal is addressing this challenge by deploying the human senses, in particular for example the taste/gustatory system, for surveillance of connective tissue degradation and pathogen presence (see also  FIG. 1 ). This radically new and easy to use diagnostic tool, identifies and stratifies subjects at risk for development of diseases caused by specific pathogens, opening a new window of opportunity for medical risk assessment and, therefore, possible intervention at an early stage. This early on detection allows pre-emptive, successful, non-complex and perhaps better tolerated treatment. The strategy followed here is disruptive in terms of shifting current point-of-care (PoC; i.e. the practitioner&#39;s office or clinic) diagnosis to self-monitoring, allowing consultation of one&#39;s medical practitioner in diseases stages which are clinically unapparent and within which relatively moderate therapeutic intervention suffice to prevent further destruction of the tissue and surrounding tissues and in contrast to more radical interventions necessary at later stages (see also  FIG. 1 ). 
     A completely new diagnosing platform has thus been developed by means of gaining access to the advanced technological capabilities of several contributors. 
     According to a preferred embodiment of the present invention therefore, the marker inducing the change is a proteolytic enzyme released or, in case of a virus or a prion, upregulated, by pathogens, preferably by bacteria, viruses, protozoa or fungi, more preferably the following class, order, genera, family of species of herpes, varicella, parvovirus, papillomavirus, polyomavirus, adenovirus, hepadnavirus, variolavirus, picornavirus, aso- and caliciavirus, human cytomegalovirus, hepatitis-A-virus, hepatitis-C-virus, hepatitis-E-virus, togavirus, flavivirus, coronavirus, retrovirus, HIV, reovirus, orthomyxovirus, bunyavirusarenavirus, human rhinovirus, dengue virus, varicella-zoster virus, paramyxovirus, rubulavoris, morbillivirus, west nile virus, yellow fever virus, pneimovirus, non classified paramyxovirus, rhabdovirus, folovirus, viroids and prions,  staphylococcus, streptococcus  and  enterococcus, bacillus, listeria, erysipelothrix, garderella, corynebacterium, actinomyces, mycobacterium, nocardia, neisseria, acinetobacter  and  moraxella , enterbacteriacea including  salmonella shigella, yersinia, E. coli  and  vibrio, aeromonas, plesiomonas, haemophilus, pasteurella, campyhlobacter, heliobacter, spirillum, pseudomonas, stenotropomonas, burkholderia, legionella, brucella, bordetella francisella , bacteriodaceae including  trepponema, borrelia peptospira rickettsia, coxiella, orientia, ehrlichia, baronella afipia, chlamydia, mycoplasma  and  histoplasma, coccidioides, blasomyces, paracoccidioides, candida, aspergillus, Cryptococcus, mucor, absidia, rhizopus, phaeohyphomycetes, hyalohyphomycetes, penicillium, pneumocystis, tyrpanoma, leishmania, giradia, trichomonas, entamoeba, naegleria, toxoplasma isspora, cyclospora, sarcocystis, cryptosporidium, plasmodium, babesia, microsporida , and  balantidium.    
     The marker inducing the change in accordance with yet another preferred embodiment is most preferably a protease expressed by this pathogen, for example pathogen-specific proteases or a matrix metalloproteinase (MMP), in particular a matrix metalloproteinase-8 (MMP-8) or an activated matrix metalloproteinase-8 (aMMP-8). 
     
       
         
               
             
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Selection of pathogens, associated proteases to which the sensitive system presented 
               
               
                 here within is responsive and examples of peptide sequences, which can be used 
               
               
                 to build the system, wherein the peptide sequences mentioned in the cited references 
               
               
                 are expressly included into the present disclosure (see FIG. 1). 
               
             
          
           
               
                   
                   
                 Literature, within which the protease 
               
               
                 Pathogen 
                 Protease 
                 sensitive sequence is mentioned 
               
               
                   
               
               
                 Kaposi&#39;s sarcoma- 
                 KSHV protease 
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                 associated herpes virus 
                   
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                 human herpes virus 8 
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                 (1999) 
               
               
                 (HHV-8)) 
                   
                   
               
               
                 herpes simplex virus type 
                 herpes simplex virus 
                 D. L. Hall and P. L. Darke, J. Biol. Chem., 
               
               
                 1 (HSV-1) 
                 type 1 protease (HSV- 
                 270, 22697 (1995) 
               
               
                   
                 1 protease) 
                 D. J. McGeoch et al., J. Gen. Virol., 69, 
               
               
                   
                   
                 1531 (1988) 
               
               
                   
                   
                 A. R. Welch et al., J. Virol., 65, 4091 
               
               
                   
                   
                 (1991) 
               
               
                   
                   
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                 USA, 88, 10792 (1991) 
               
               
                   
                   
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                 (1997) 
               
               
                 Inluenza and SARS 
                 type II transmembrane 
                 S. Bertram, PLoS One. 7, e35876. 
               
               
                   
                 serine proteases 
                 (2012) 
               
               
                   
                 (TTSPs) TMPRSS2 
                   
               
               
                   
                 and HAT 
                   
               
               
                 Human papillomavirus 16 
                 Matrix- 
                 L. B. Cardeal et al., PLoS One, 7, 
               
               
                 and 18 (HPV) 
                 metalloprotease MMP- 
                 e33585. (2012) 
               
               
                   
                 2, MMP-9, MT1-MMP 
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                 e54423 (2013) 
               
               
                   
                   
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                 (2013) 
               
               
                 Human  cytomegalovirus   
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                   cytomegalovirus 
                 
                 255, 59 (1998) 
               
               
                   
                 protease 
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                 255, 59 (1998) 
               
               
                   
                   
                 S. R. LaPlante et al., J. Am. Chem. 
               
               
                   
                   
                 Soc., 121, 2974 (1999) 
               
               
                   
                 human CMV 
                 B. P. Holskin et al., Anal. Biochem., 
               
               
                   
                 assemblin protease 
                 227, 148 (1995) 
               
               
                   
                   
                 B. P. Holskin et al., Anal. Biochem., 
               
               
                   
                   
                 227, 148 (1995) 
               
               
                   
                   
                 R. Batra et al., Nat. Struct. Biol., 8, 810 
               
               
                   
                   
                 (2001) 
               
               
                 Human Rhinovirus-14 
                 Human Rhinovirus-14 
                 M. G. Cordingley et al., J. Biol. Chem., 
               
               
                 (HRV14) 
                 (HRV14) Protease 
                 265, 9062 (1990) 
               
               
                   
                 human rhinovirus-14 
                 Q. M. Wang et al., Arch. Biochem. 
               
               
                   
                 2A protease 
                 Biophys., 356, 12 (1998) 
               
               
                   
                 human rhinovirus-14 
                 Q. M. Wang et al., Anal. Biochem., 252, 
               
               
                   
                 3C protease 
                 238 (1997) 
               
               
                   
                 human rhinovirus 2A 
                 Q. M. Wang et al., Arch. Biochem. 
               
               
                   
                 protease 
                 Biophys., 356, 12 (1998) 
               
               
                 Hepatitis A virus (HAV) 
                 Hepatitis A virus 
                 L. Qu, PLoS Pathog. 2011 
               
               
                   
                 protease 
                 7(9): e1002169 
               
               
                 Hepatitis C Virus (HCV) 
                 NS3-4A protease 
                 P. Hamill and F. Jean, Biochemistry, 44, 
               
               
                   
                   
                 6586 (2005) 
               
               
                   
                 HCV NS3 protease 
                 M. Taliani et al., Anal. Biochem., 240, 
               
               
                   
                   
                 60 (1996) 
               
               
                   
                 NS3 protease 
                 Y. Shimuzu et al., J. Virol., 70, 127 
               
               
                   
                   
                 (1996) 
               
               
                   
                 serine NS3/4A 
                 Y. Yang,. Proc. Natl. Acad. Sci. USA,. 
               
               
                   
                 protease 
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                 E. Foy, Science. 16, 300 (2003) 
               
               
                 Dengue virus 
                 Dengue virus protease 
                 T J Chambers, Annu Rev Microbiol 
               
               
                   
                   
                 1990, 44:649-688. 
               
               
                   
                   
                 B. Falgout, J Virol 1991, 65 
               
               
                 Varicella-Zoster virus 
                 Varicella-Zoster virus 
                 X. Qiu, Proc Natl Acad Sci USA. 
               
               
                 (VZV) 
                 protease 
                 1997,; 94(7) 
               
               
                 Human 
                 HIV protease 
                 M. W. Pennington et al., Peptides 1992, 
               
               
                 immunodeficiency virus 
                   
                 Proceedings of the 22nd European 
               
               
                 (HIV) 
                   
                 Peptide Symposium, Interlaken, 
               
               
                   
                   
                 Switzerland, p. 936, C. H. Schneider 
               
               
                   
                   
                 and A. N. Eberle, eds., Escom, Leiden, 
               
               
                   
                   
                 (1993) 
               
               
                   
                 HIV-1 protease 
                 E. D. Matayoshi et al., Science, 247, 
               
               
                   
                   
                 954 (1990) 
               
               
                   
                   
                 U. Nillroth et al., Antimicrob. Agents 
               
               
                   
                   
                 Chemother., 41, 2383 (1997) 
               
               
                   
                   
                 L. Bannwarth et al., J. Med. Chem., 49, 
               
               
                   
                   
                 4657 (2006) 
               
               
                   
                   
                 M. W. Pennington et al., Peptides 1990, 
               
               
                   
                   
                 Proceedings of the 21st European 
               
               
                   
                   
                 Peptide Symposium, Platja d&#39;Aro, 
               
               
                   
                   
                 Spain, p. 787, E. Giralt and D. Andreu, 
               
               
                   
                   
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                 265, 7733 (1990) 
               
               
                   
                   
                 L. H. Phylip et al., Biochem. Biophys. 
               
               
                   
                   
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                 C. Paulus et al., J. Biol. Chem., 274, 
               
               
                   
                   
                 21539 (1999) 
               
               
                   
                 HIV-2 Protease 
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                 BIOCHEMISTRY 233, 1-14 (1996) 
               
               
                 West nile virus (WNV) 
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                 56, 371 (2002) 
               
               
                 Yellow fever virus 
                 Yellow fever virus 
                 M Y Kondo Biochem Biophys Res 
               
               
                   
                 NS2B/NS3 protease 
                 Commun. 2011; 407(4) 
               
               
                 Plasmodia 
                 Malaria Aspartyl 
                 Pennington et al., Innovation and 
               
               
                   
                 Proteinase 
                 Perspectives in Solid Phase Synthesis 
               
               
                   
                   
                 &amp; Combinatorial Libraries, 5th 
               
               
                   
                   
                 International Symposium, London, p. 
               
               
                   
                   
                 367, R. Epton, ed., Mayflower 
               
               
                   
                   
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                 Chemother., 45, 2577 (2001) 
               
               
                   
                   
                 M. Stadler et al., J. Antibiot., 58, 775 
               
               
                   
                   
                 (2005) 
               
               
                 SARS 
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                 C.-J. Kuo et al., Biochem. Biophys. 
               
               
                   
                   
                 Res. Commun., 318, 862 (2004) 
               
               
                   
                 SARS- coronavirus   
                 K. Anand et al., Science, 300, 1763 
               
               
                   
                 main protease Mpro 
                 (2003) 
               
               
                 
                   Streptomyces albus 
                 
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                 O. Dideberg, FEBS Lett.; 117, 1 (1980) 
               
               
                   
                 DD-carboxypeptidase 
                   
               
               
                 
                   Candida albicans 
                 
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     The gustatory system principally has four primary taste submodalities recognizing sweet, sour, salty, and bitter. Maximal sensitivity is provided for bitter taste and bitter taste can be calibrated for control of inter-patient variability using methods outlined in the European Pharmacopoeia. Sweet taste is more difficult to calibrate among patients but used as a strategy as well in spite of potential challenges for individual calibration of sweet perception. The human tongue offers a fascinating range of sensitivity for tasting sweetness and bitterness, covering five orders of magnitude. Quinine sulfate (bitter) is sensed down to 0.0004 mM, rivaling even our most advanced analytical detectors available today. The artificial sweetener, saccharin, is recognized down to 0.02 mM by the average human. Within the context of this application it is important, that certain short peptides can be typically sensed down to 0.05 to 6 mM and this insight is deployed by designing peptide sequences for the system which result in bitter taste following cleavage. By this strategy, the coupling of a flavoring substance can be avoided as the cleaved peptide sequence itself mediates a bitter sensation recognized by the affected patient. 
     In conclusion, in particular a pathogen-specific protease sensitive system provides the necessary power to the medical practitioner for early detection and continuous surveillance of presence of pathogens. The system provides radically new, easy to use tools to the medical practitioner and patient for early on monitoring of pathogen presence with immediate relevance on patient health or for broad screening of humans as pathogenic carriers. 
     The proposed system aims at broad application, including sensing of nasal, pharyngeal, laryngeal, ocular and/or pulmonal alterations following the principle outlined here. 
     The system is thus radically shifting monitoring of pathogens from assessments involving complex machinery to self-monitoring using the human tongue or the human eye of the user as a sensitive detector. Instead of restricting the monitoring of the health status to visits at the medical practitioner, the approach supports frequent self-monitoring such that in case of positive signal, the subject can visit the medical practitioner&#39;s office to get a thorough diagnosis. 
     The system (see also  FIG. 2 ) is the mode by which clinically unapparent diseased tissue becomes detected early on. The main innovation aspects are the following:
         The deployment of human taste sensing/gustatory system for monitoring of pathogens is radically new.   Chewing gums with diagnostic features are known but not those which respond to an enzyme indicative for the presence of a pathogen.   Selection of pathogen-specific protease sensitive systems from known sequences which provide the necessary performance to preferentially sense pathogen-specific protease at levels at which pathogenic flora is differentiated from non-pathogen flora.   The correlation of pathogen presence with pathogen-specific protease presence as done here controls the information available in literature by data sets to provide a reliable basis for fine-tuning and adapting our system&#39;s sensitivity and selectivity to specific activities of a pathogen&#39;s lifecycle. Different proteases are activated at different time points of a pathogen&#39;s normal life cycle and, therefore systems are possible which are responsive not only to a pathogen but specifically to a certain activation status of the pathogen.   Modern coupling techniques are deployed to decorate the plastic (spheric system) with the peptide sequences.       

     The coupled flavoring substances may reduce their potential for (bitter) taste once attached to the peptide sequence. This risk can be mitigated by selecting different coupling sites at the (bitter) tasting molecule, by selecting different (bitter) tasting molecules and by designing bitter tasting peptide sequences, which are known to induce a bitter taste. Correspondingly therefore in accordance with yet another preferred embodiment the element can on the one hand be a molecule or molecular assembly which, upon direct or indirect contact with the marker undergoes a color change perceivable by the naked eye of the user, and which is embedded or attached to the base material or to particles embedded and/or attached to said base material. 
     On the other hand the element can be a flavor molecule releasably, preferably releasably covalently, attached to the base material or to particles embedded and/or attached to said base material. 
     The flavor molecule can be (releasably) attached to the base material or to particles embedded and/or attached to said base material by means of a hydrogen bonding or by means of a molecular chain cleavable under direct or indirect contact with the marker. Release is for example possible by lysis of the molecular chain by the marker itself, it is however also possible by means of mechanisms such as agglomeration or attachment of the marker to the linker or another element close by, inducement of a conformational change or the like, corresponding reduction of the binding constant of the flavor molecule to the support and release of the molecule to generate the corresponding taste sensation. 
     The molecular chain can for example be a polypeptide chain or a sugar chain or a combination thereof. In case of a polypeptide chain, this is preferably constituted of 2-15, most preferably of 3-9 amino acids, and preferably the linker molecule is either directly or indirectly, via an anchoring element, attached to the base material or to particles embedded and/or attached to said base material. 
     Possible linker sequences to be used as molecular chain cleavable under direct or indirect contact with the marker for the attachment of e.g. a bitter flavor molecule such as quinine, caffeine, theobromine, naringin, sucralose or neotame are given by the following systems, where the cleavage site by the protease system is partly indicated by a slash: 
     The single-letter code for amino acids is used: A, Ala; C, Cys; D, Asp; E, Glu; F, Phe; G, Gly; H, His; I, Ile; K, Lys; L, Leu; M, Met; N, Asn; P, Pro; Q, Gln; R, Arg; S, Ser; T, Thr; V, Val; W, Trp; Y, Tyr. 
     
       
         
               
               
             
           
               
                   
                 HAV (Hepatitis A virus): 
               
               
                   
                 (SEQ ID NO: 1) 
               
               
                   
                 DWSQ/GCSL 
               
               
                   
                   
               
               
                   
                 (SEQ ID NO: 2) 
               
               
                   
                 EISQ/SPTM 
               
               
                   
                   
               
               
                   
                 (SEQ ID NO: 3) 
               
               
                   
                 IREQSQ/HLDG 
               
               
                   
                   
               
               
                   
                 (SEQ ID NO: 4) 
               
               
                   
                 LSYQAQ/MEQL 
               
               
                   
                   
               
               
                   
                 (SEQ ID NO: 5) 
               
               
                   
                 FGGQ/VPLG 
               
               
                   
                 L. Qu,  PLoS Pathog . 2011 7 (9): e1002169 
               
             
          
         
       
     
     
       
         
               
             
           
               
                 HVC (Hepatitis C Virus): 
               
               
                 (SEQ ID NO: 6) 
               
               
                 EVVTSTWV 
               
               
                   
               
               
                 (SEQ ID NO: 7) 
               
               
                 MEECSQHL 
               
               
                   
               
               
                 (SEQ ID NO: 8) 
               
               
                 TTPCSGSW 
               
               
                 (SEQ ID NO: 9) 
               
               
                 VVCCSMSY 
               
               
                 S. A. Shiryaev,  PLoS One . 2012; 7(4): e35759. 
               
               
                   
               
               
                 (SEQ ID NO: 10)  
               
               
                 DLEVVTS 
               
               
                 S. S. Leinbach,  Virology , 204, 1, 1994 
               
               
                   
               
               
                 (SEQ ID NO: 11) 
               
               
                 DLEVVT/STWV 
               
               
                   
               
               
                 (SEQ ID NO: 12) 
               
               
                 DEMEEC/ASHL 
               
               
                   
               
               
                 (SEQ ID NO: 13) 
               
               
                 DCSTPC/SGSW 
               
               
                   
               
               
                 (SEQ ID NO: 14) 
               
               
                 ESVVCC/SMSY 
               
               
                 Y. Benureaua,  Virology , 406, 2, 2010 
               
               
                   
               
               
                 HCV 
               
               
                 (SEQ ID NO: 15) 
               
               
                 NGVCWTVY/HGAGT 
               
               
                   
               
               
                 (SEQ ID NO: 16) 
               
               
                 YTNVDN/DLVGWPAPQ 
               
               
                   
               
               
                 (SEQ ID NO: 17) 
               
               
                 PISYLKGS/SGGPLL 
               
               
                   
               
               
                 dengue virus type 1 DEN1 
               
               
                 (SEQ ID NO: 18) 
               
               
                 DGVFHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 19) 
               
               
                 WASVKKDLISYGGGW 
               
               
                   
               
               
                 (SEQ ID NO: 20) 
               
               
                 ALDFKPGTSGSPIV 
               
               
                   
               
               
                 DEN2 
               
               
                 (SEQ ID NO: 21) 
               
               
                 EGTFHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 22) 
               
               
                 WADVKKDLISYGGGW 
               
               
                   
               
               
                 (SEQ ID NO: 23) 
               
               
                 SLDFSPGTSGSPIV 
               
               
                   
               
               
                 DEN3 
               
               
                 (SEQ ID NO: 24) 
               
               
                 EGVFHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 25) 
               
               
                 WASVKKDLISYGGGW 
               
               
                   
               
               
                 (SEQ ID NO: 26) 
               
               
                 ALDFKPGTSGSPII 
               
               
                   
               
               
                 DEN4 
               
               
                 (SEQ ID NO: 27) 
               
               
                 EGVFHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 28) 
               
               
                 WADVRNDMISYGGGW 
               
               
                   
               
               
                 (SEQ ID NO: 29) 
               
               
                 TLDFKPGTSGSPII 
               
               
                   
               
               
                 Japanese encephalitis virus JE 
               
               
                 (SEQ ID NO: 30) 
               
               
                 ENVFHTLWHTTRG 
               
               
                   
               
               
                 (SEQ ID NO: 31) 
               
               
                 WGSVKEDRIAYGGPW 
               
               
                   
               
               
                 (SEQ ID NO: 32) 
               
               
                 SLDYPRGTSGSPIL 
               
               
                   
               
               
                 yellow fever virus YF 
               
               
                 (SEQ ID NO: 33) 
               
               
                 GGVFHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 34) 
               
               
                 WASVKEDLVAYGGSW 
               
               
                   
               
               
                 (SEQ ID NO: 35) 
               
               
                 ALDYPSGTSGSPIV 
               
               
                   
               
               
                 tick-borne encephalitis virus TBE 
               
               
                 (SEQ ID NO: 36) 
               
               
                 KGVLHTMWHVTRG 
               
               
                   
               
               
                 (SEQ ID NO: 37) 
               
               
                 WADVREDWVCYGGAW 
               
               
                   
               
               
                 (SEQ ID NO: 38) 
               
               
                 PIDLVKGTSGSPIL 
               
               
                 HCV, dengue virus type 1, 2, 3, 4 (DEN 1, 2, 3,  
               
               
                 4, 5), A Grakoui,  J Virol . 1993 May; 67 (5) 
               
             
          
         
       
     
     
       
         
               
             
           
               
                 HIV: 
               
               
                 HIV-1 Protease Cleavage Site Amino Acid Sequences: 
               
               
                 (SEQ ID NO: 39) 
               
               
                 VSQNY/PIVQN 
               
               
                   
               
               
                 (SEQ ID NO: 40) 
               
               
                 KARVL/AEAMS 
               
               
                   
               
               
                 (SEQ ID NO: 41) 
               
               
                 STAIM/MQKGN 
               
               
                   
               
               
                 (SEQ ID NO: 42) 
               
               
                 ERQAN/FLGKI 
               
               
                   
               
               
                 (SEQ ID NO: 43) 
               
               
                 RPGNF/LQSRP 
               
               
                   
               
               
                 (SEQ ID NO: 44) 
               
               
                 ERQAN/FLREN 
               
               
                   
               
               
                 (SEQ ID NO: 45) 
               
               
                 ENLAF/QQGEA 
               
               
                   
               
               
                 (SEQ ID NO: 46) 
               
               
                 TSFSF/PQITC 
               
               
                   
               
               
                 (SEQ ID NO: 47) 
               
               
                 CTLNF/PISPI 
               
               
                   
               
               
                 (SEQ ID NO: 48) 
               
               
                 GAETF/YVDGA 
               
               
                   
               
               
                 (SEQ ID NO: 49) 
               
               
                 IRKVL/FLDGI 
               
               
                   
               
               
                 (SEQ ID NO: 50) 
               
               
                 PDCAW/LEAQE 
               
               
                 T. De Oliveira T et al., 2003.  Journal of Virology   
               
               
                 77(17) 
               
               
                 K. Ikuta et al., 2000.  Microbiol. Mol. Biol. Rev.   
               
               
                 64. 
               
               
                 T. Jacks et al. 1998.  Nature  331. 
               
               
                 H. Krausslich et al., 1989.  Proc. Natl. Acad. Sci.   
               
               
                   USA  86 
               
               
                 R. Swanstrom and J. W. Wills. 1997. Cold Spring 
               
               
                 Harbor Laboratory, Cold Spring Harbor, N.Y. 
               
               
                 S. Billich et al. 1988.  J. Biol. Chem.  263 
               
               
                   
               
               
                 (SEQ ID NO: 142) 
               
               
                 VSQNY/IVQN 
               
               
                 M. Prabu-Jeyabalan et al.,  Structure.  2002 March; 
               
               
                 10(3): 369-81. 
               
             
          
         
       
     
     
       
         
               
               
             
           
               
                   
               
               
                 Sequence 
                 Protein 
               
               
                   
               
             
             
               
                 TQIM/F E T F 
                 Actin (SEQ ID NO: 51) 
               
               
                   
               
               
                 G Q V N/Y E E F 
                 Calmodulin (SEQ ID NO: 52) 
               
               
                   
               
               
                 P F I F/E E E P 
                 Pro-IL1-b (SEQ ID NO: 53) 
               
               
                   
               
               
                 S F N F/P Q I T 
                 pol (SEQ ID NO: 54) 
               
               
                   
               
               
                 D T V L/E E M S 
                 Autolysis (SEQ ID NO: 55) 
               
               
                   
               
               
                 A R V L/A E A M 
                 gag (SEQ ID NO: 56) 
               
               
                   
               
               
                 A E E L/A E I F 
                 Troponin C (SEQ ID NO: 57) 
               
               
                   
               
               
                 S L N L/R E T N 
                 Vimentin (SEQ ID NO: 58) 
               
               
                   
               
               
                 A T I M/M Q R G 
                 gag (SEQ ID NO: 59) 
               
               
                   
               
               
                 A E C F/R I F D 
                 Troponin C (SEQ ID NO: 60) 
               
               
                   
               
               
                 D Q I L/I E I C 
                 Autolysis (SEQ ID NO: 61) 
               
               
                   
               
               
                 D D L F/F E A D 
                 Pro-IL1-b (SEQ ID NO: 62) 
               
               
                   
               
               
                 Y E E F/V Q M M 
                 Calmodulin(SEQ ID NO: 63) 
               
               
                   
               
               
                 P I V G/A E T F 
                 pol (SEQ ID NO: 64) 
               
               
                   
               
               
                 T L N F/P I S P 
                 pol (SEQ ID NO: 65) 
               
               
                   
               
               
                 R E A F/R V F D 
                 Calmodulin (SEQ ID NO: 66) 
               
               
                   
               
               
                 A E T F/Y V D K 
                 pol (SEQ ID NO: 67) 
               
               
                   
               
               
                 A Q T F/Y V N L 
                 pol (SEQ ID NO: 68) 
               
               
                   
               
               
                 P T L L/T E A P 
                 Actin (SEQ ID NO: 69) 
               
               
                   
               
               
                 S F I G/M E S A 
                 Actin (SEQ ID NO: 70) 
               
               
                   
               
               
                 D A I N/T E F K 
                 Vimentin (SEQ ID NO: 71) 
               
               
                   
               
               
                 Q I T L/W Q R P 
                 Autolysis (SEQ ID NO: 72) 
               
               
                   
               
               
                 E L E F/P E G G 
                 PE664E (SEQ ID NO: 73) 
               
               
                   
               
               
                 A N L/A E E A 
                 PE40 (SEQ ID NO: 74) 
               
               
                   
               
               
                 S Q N Y/P I V Q 
                 gag (SEQ ID NO: 75) 
               
               
                   
               
               
                 P G N F/L Q S R 
                 gag (SEQ ID NO: 76) 
               
               
                   
               
               
                 K L V F/F A E 
                 AAPd (SEQ ID NO: 77) 
               
               
                   
               
               
                 G D A L/L E R N 
                 PE40 (SEQ ID NO: 78) 
               
               
                   
               
               
                 K E L Y/P L T S 
                 gag (SEQ ID NO: 79) 
               
               
                   
               
               
                 R Q A N/F L G K 
                 gag (SEQ ID NO: 80) 
               
               
                   
               
               
                 S R S L/Y A S S 
                 Vimentin (SEQ ID NO: 81) 
               
               
                   
               
               
                 A E A M/S Q V T 
                 gag (SEQ ID NO: 82) 
               
               
                   
               
               
                 R K I L/F L D G 
                 pol (SEQ ID NO: 83) 
               
               
                   
               
               
                 G S H L/V E A L 
                 Insulin (SEQ ID NO: 84) 
               
               
                   
               
               
                 G G V Y/A T R S 
                 Vimentin (SEQ ID NO: 85) 
               
               
                   
               
               
                 F R S G/V E T T 
                 gag (SEQ ID NO: 86) 
               
               
                   
               
               
                 V E V A/E E E E 
                 AAPd (SEQ ID NO: 87) 
               
               
                   
               
               
                 L P V N/G E F S 
                 AAPd (SEQ ID NO: 88) 
               
               
                   
               
               
                 E T T A/L V C D 
                 Actin (SEQ ID NO: 89) 
               
               
                   
               
               
                 H L V E/A L Y L 
                 Insuline (SEQ ID NO: 90) 
               
               
                   
               
               
                 H Y G F/P T Y G 
                 NF-kBf (SEQ ID NO: 91) 
               
               
                   
               
               
                 D S A D/A E E D 
                 AAPd (SEQ ID NO: 92) 
               
               
                   
               
               
                 G W I L/G E H G 
                 LDHg (SEQ ID NO: 93) 
               
               
                   
               
               
                 G W I L/A E H G 
                 LDH (SEQ ID NO: 94) 
               
               
                   
               
               
                 A I Y/L A L Q 
                 pol (SEQ ID NO: 95) 
               
               
                   
               
               
                 E K V Y/L A W V 
                 pol (SEQ ID NO: 96) 
               
               
                   
               
               
                 V E I C/T E M E 
                 pol (SEQ ID NO: 97) 
               
               
                   
               
               
                 T Q D F/W E V Q 
                 pol (SEQ ID NO: 98) 
               
               
                   
               
               
                 L W M G/Y E L H 
                 pol (SEQ ID NO: 99) 
               
               
                   
               
               
                 G D A Y/F S V P 
                 pol (SEQ ID NO: 100) 
               
               
                   
               
               
                 E L E L/A E N R 
                 pol (SEQ ID NO: 101) 
               
               
                   
               
               
                 S K D L/I A E I 
                 pol (SEQ ID NO: 102) 
               
               
                   
               
               
                 L E V N/I V T D 
                 pol (SEQ ID NO: 103) 
               
               
                   
               
               
                 G G N Y/P V Q H 
                 gag (SEQ ID NO: 104) 
               
               
                   
               
               
                 A R L M/A E A L 
                 gag (SEQ ID NO: 105) 
               
               
                   
               
               
                 P F A A/A Q Q R 
                 gag (SEQ ID NO: 106) 
               
               
                   
               
               
                 P R N F/P V A Q 
                 gag (SEQ ID NO: 107) 
               
               
                   
               
               
                 G L A A/P Q F S 
                 gag/pol (SEQ ID NO: 108) 
               
               
                   
               
               
                 S L N L/P V A K 
                 pol (SEQ ID NO: 109) 
               
               
                   
               
               
                 A E T F/Y T D G 
                 pol (SEQ ID NO: 110) 
               
               
                   
               
               
                 R Q V L/F L E K 
                 pol (SEQ ID NO: 111) 
               
               
                   
               
               
                 Q M I F K E E H G 
                 Fibronectin k (SEQ ID NO: 112) 
               
               
                   
               
               
                 Kuo-Chen Chou,  ANALYTICAL BIOCHEMISTRY  233, 1-14 (1996) 
               
             
          
         
       
     
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 HIV-2 Protease Cleavage Site Amino Acid Sequences: 
               
             
          
           
               
                 Sequence 
                 Protein 
               
               
                   
               
               
                 S Q N Y/P I V Q 
                 gag (SEQ ID NO: 113) 
               
               
                   
               
               
                 E E E L/A E C F 
                 Troponin C (SEQ ID NO: 114) 
               
               
                   
               
               
                 T Q I M/F E T F 
                 Actin (SEQ ID NO: 115) 
               
               
                   
               
               
                 G Q V N/Y E E F 
                 Calmodulin (SEQ ID NO: 116) 
               
               
                   
               
               
                 G C N Y/P V Q H 
                 gag (SEQ ID NO: 117) 
               
               
                   
               
               
                 P R N F/P V A Q 
                 gag (SEQ ID NO: 118) 
               
               
                   
               
               
                 A E E L/A E I F 
                 Troponin C (SEQ ID NO: 119) 
               
               
                   
               
               
                 P F A A/A Q Q R 
                 gag (SEQ ID NO: 120) 
               
               
                   
               
               
                 R Q V L/F L E K 
                 pol (SEQ ID NO: 121) 
               
               
                   
               
               
                 A T I M/M Q R G 
                 gag (SEQ ID NO: 122) 
               
               
                   
               
               
                 S L N L/P V A K 
                 pol (SEQ ID NO: 123) 
               
               
                   
               
               
                 A N L/A E E A 
                 PE40 (SEQ ID NO: 124) 
               
               
                   
               
               
                 P T L L/T E A P 
                 Actin (SEQ ID NO: 125) 
               
               
                   
               
               
                 S F I G/M E S A 
                 Actin (SEQ ID NO: 126) 
               
               
                   
               
               
                 Y E E F/V Q M M 
                 Calmodulin (SEQ ID NO: 127) 
               
               
                   
               
               
                 R H V M/T N L G 
                 Calmodulin (SEQ ID NO: 128) 
               
               
                   
               
               
                 Y I S A/A E L R 
                 Calmodulin (SEQ ID NO: 129) 
               
               
                   
               
               
                 G L A A/P Q F S 
                 pol (SEQ ID NO: 130) 
               
               
                   
               
               
                 D G N G/T I D F 
                 Calmodulin (SEQ ID NO: 131) 
               
               
                   
               
               
                 G D A L/L E R N 
                 PE40 (SEQ ID NO: 132) 
               
               
                   
               
               
                 N P T E/A E L Q 
                 Calmodulin (SEQ ID NO: 133) 
               
               
                   
               
               
                 R Q A G/F L G L 
                 gag (SEQ ID NO: 134) 
               
               
                   
               
               
                 Kuo-Chen Chou,  ANALYTICAL BIOCHEMISTRY  233, 1-14 (1996) 
               
             
          
         
       
     
     
       
         
               
             
           
               
                 Yellow fever: 
               
               
                 (SEQ ID NO: 135) 
               
               
                 SSRKRR/SHDVLTQ 
               
               
                   
               
               
                 (SEQ ID NO: 136) 
               
               
                 RIFGRR/SIPVNEQ 
               
               
                   
               
               
                 (SEQ ID NO: 137) 
               
               
                 VRGARR/SGDVLWQ 
               
               
                   
               
               
                 (SEQ ID NO: 138) 
               
               
                 SAAQRR/GRIGRNQ 
               
               
                   
               
               
                 (SEQ ID NO: 139) 
               
               
                 FAEGRR/GAAEVLQ 
               
               
                   
               
               
                 (SEQ ID NO: 140) 
               
               
                 KLAQRR/VFHGVAQ 
               
               
                   
               
               
                 (SEQ ID NO: 141) 
               
               
                 MKTGRR/GSANGKQ 
               
               
                 MY Kondo et al.  Biochem Biophys Res Commun.  407 
               
               
                 (4): 640-4 (2011) 
               
             
          
         
       
     
     Generally speaking, combinations of Tyr, Ile, Phe, Pro, Leu, Val (single-letter codes for potentially bitter amino acids were marked in red) can be used for the bitter part. 
     Ethylation or acetylation just ahead of the cleavage site can be used to reduce the bitterness sequences. 
     The flavor molecule upon release preferably triggers the gustatory system of the user, preferably by stimulating a sweet and/or bitter taste. 
     The change upon direct or in direct contact with the marker is, in accordance with yet another preferred embodiment, triggered when a minimum marker concentration in saliva of the user is reached, wherein preferably the marker is a pathogen protease and wherein the minimum marker concentration is in the range of 50-100 U or in the range of 500-700 U. 
     The element can be attached to a particle with a size in the range of 0.5-1000 μm, preferably in the range of 20-250 μm, wherein preferably the particle is based on a polymer or copolymer or a (co)polymer mixture or (co)polymer blend, preferably on a polymer or copolymer selected from the group consisting of polystyrene, poly(methylmethacrylate), also possible are polyethylene, polypropylene, poly(vinylchloride), polycarbonate, polyamide, polysulfone, poly(ethersulfone), polyether, poly(ether-ketone), poly(ether-ether-ketone), poly(tetrafluoroethylen), poly(vinylidenefluoride), polyester, poly(hydroxyalkanoate), polyurethane, polyimide, poly(ether-imide), poly(butadiene), poly(vinylbutyral), polyanhydride, poly(amino acid), poly(organosiloxane), cellulose, chitin or a mixture or blend thereof. The systems can form a three-dimensional matrix, e.g. due to cross-linking processes. The three-dimensional matrix can be based on carboxy groups, amino groups, thiol groups or combinations thereof. Preferably poly(methylmethacrylate) with a three-dimensional carboxy group matrix is used. 
     Preferably the element, or an interlinked anchoring element, is attached to the particle by means of conventional coupling techniques, preferably by amide formation using conventional peptide coupling methods, disulfide coupling, ester formation using common procedures like carbodiimide-activated esterifications, urethane, urea or isothiourea formation generated by reaction with diisocyanates or diisothiocyanates, ether formation by reaction with epoxy group containing molecules like diepoxides or activated haloalkyl derivatives, reaction with dialdehydes followed by reductive amination, Michael-type addition reaction as e. g. performed by reaction of an acrylated reaction partner with a thiol-modified one or by known Click Chemistry coupling protocols like the Cu(I)-promoted azide-alkyne [3+2] cycloaddition. 
     Nasal, oropharyngeal, laryngeal, ocular and/or pulmonal alterations due to pathogen presence normally are characterized by the activation of more or less specific pathogen-proteases, which are indicative for a risk of developing their associated disease. The origin of the pathogens can for example in particular be based on at least one of the following inflammatory states: rhinitis, sinusitis, pansinusitis, rhinosinusitis, pneumonitis, pharyngitis, laryngitis, conjunctivitis, uveitis, blepharitis, orbital cellulitis, frontal or paranasal or maxillary sinusitis, cold, influenza, influenzal infection, abscess in mouth or throat or nose or lung, TBC, pneumonia, mycosis in mouth or throat or nose or lung. 
     Furthermore the present invention relates to the use of a chewing gum as outlined above for the detection of pathogen presence detectable via the mouth, in particular in relation with nasal, oropharyngeal, laryngeal, oesophageal, ocular and/or pulmonal pathogen presence. Further embodiments of the invention are laid down in the dependent claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred embodiments of the invention are described in the following with reference to the drawings, which are for the purpose of illustrating the present preferred embodiments of the invention and not for the purpose of limiting the same. In the drawings, 
         FIG. 1  schematically shows the diagnostic approach followed in this application for early diagnosis of risk factors for the development of infections, wherein the system (box 5) is sensing pathogen-specific protease regulation indicative for the presence of the pathogen; today pathogens are typically recognized once clinical signs appear (box 4) a stage at which the disease course may be irreversible and lasting complications may prevail or missing a disease state within which a patient is highly contaminous yet the outbreak of the disease with easy to identify symptoms has not commenced yet; today, assessments of viral, bacterial or fungal load typically involve complex biochemical tests, the results of which are only obtained with significant lag time; in contrast, the proposed systems are designed to allow on-demand, self-monitoring, so therefore the patient is providing continuous monitoring and based on this the medical practitioner can diagnose complications early on. Alternatively, such systems may be used to screen larger populations throughout threats (such as SARS, or bird flue) or for border control to screen immigrants for the presence of pathogens; 
         FIG. 2  shows in (A) how the functionality is linked to the pathogen&#39;s protease sensitive peptide sequence (center portion) located in between an anchor (left) and a flavoring substance (right); in (B) how the sequence is linked to particles or another surface, referred to as ‘system’ in this application; upon contact with pathogen protease at specific levels, the peptide sequence is cleaved and the off-coming flavoring substance triggers an intensive taste recognized by the patient; in (C) how the system is formulated into a chewing gum; during chewing, the self-monitoring is on for presence of pathogens being a prognostic factor for risk of disease development; the chewing gum is providing a full profile; and 
         FIG. 3  shows different embodiments, wherein in a) and b) a first embodiment is shown, in which the linker sequence attached to a substrate or an anchor, to which initially (a) the flavoring substance is attached, is cleaved for the release of the flavoring substance (b), in c) and d) a second embodiment is shown, in which the linker sequence attached to a substrate or an anchor, to which initially (c) the flavoring substance is attached by a non-covalent bonding, for example a coordinative bonding, is conformationally changed such as to release the flavoring substance (d), and in e) and a third embodiment is shown, in which a substance attached via linker to a substrate (e) and showing a color change upon contact with the trigger molecule. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       FIG. 3  shows different possibilities for attachment of releasable flavor substances  1  ( a )-( d ) or for the attachment of a colorant susceptible to change color upon interaction with MMP, in particular MMP-8, or another marker, present in saliva. 
     In the first embodiment as illustrated in  FIG. 3   a , on a substrate  3 , which can for example be a particle or the base material of the chewing gum, the flavoring substance molecule or complex  1  is attached via a linker element  2 , normally a short and cleavable polypeptide chain. The flavoring substance molecule  1  may itself be a polypeptide or protein, and it may just be the extension of the linker element  2 . Upon contact of the marker  4  present in saliva with the linker element  2 , the latter is cleaved due to proteolytic interaction, releasing the flavoring substance into the free state  5 , inducing the taste sensation (see  FIG. 3 b   ). 
     As illustrated in  FIGS. 3 c   ) and  d ), the interaction between the trigger/marker  4  present in saliva is not necessarily a direct interaction in the sense of a proteolytic interaction between the protease trigger and the linker element, it can also be an indirect interaction for example in the sense that the protease trigger attaches or forms a complex with the substrate in the vicinity of the linker element, induces some change, for example a change in the hydrogen bonding structure, and thereby releases the flavoring molecule or flavoring complex  5  into the surrounding saliva. In this case there is normally no chemical bond between the linker element  2  and the flavoring substance  1 , however it is also possible that the protease trigger attaches and itself triggers a proteolytic system mounted on the substrate  3  or the linker element  2  leading to a proteolytic cleavage for the release of the flavoring substance.  FIG. 3 e   ) and  f ) show the situation where the protease trigger does not induce release of flavoring substance but a color change. To this end upon contact of the protease trigger  4  with the corresponding colorant substance  6 , the latter is transformed into a second, differently colored state  7  leading to a visual signal perceptible to the user and indicative offer a sufficient level of protease trigger. It is not only possible that, as illustrated in  FIG. 3 e   ) and  f ), the color change takes place in a situation where the colorant  6  remains to be fixed to the chewing gum, it is also possible that the colorant  6  is released upon contact with the MMP trigger leading to a color change in saliva or in mouth tissue perceivable to the user. 
     EXPERIMENTAL SECTION 
     In a first step peptide sequences composed of (i) anchor coupled to (ii) sensitive peptide sequence coupled to (iii) flavoring substance using solid phase chemistry ( FIG. 2 ), were synthesized by using a solid phase synthesis of pathogen-sensitive systems. 
     Three components of the system were synthesized (from C—N Terminus): (i) anchor coupled to (ii) sensitive peptide sequence coupled to (iii) flavoring substance. 
     30 systems with different protease sensitive protein sequences (as a platform from which sequences can be selected with best respective pathogen-protease selectivity and tailored sensitivity to pathogen-protease cleavage) were synthesized. Synthesis is performed using an automated solid phase peptide synthesis (SPPS) platform or peptides are obtained commercially. Synthesis (C to N-terminus) is following established protocols by coupling the carboxyl group of one amino acid to the amino group of another and by adequate use of protecting groups to avoid unintended reactions. Finally, the flavoring substance is attached as outlined below. The taste of the cleaved peptide sequence fragment coupled to the flavoring substance is tested by human volunteers and feedback from these tests helped to further modify the peptide sequence and flavoring substance for optimized bitter taste. Bitterness in oligopeptides is closely related to hydrophobicity. In fact and for screening purposes, one can proceed by assaying the Q value of peptides (a measure of the average hydrophobicity of a peptide, with Q&gt;1,400 cal/mol being a threshold for possible bitter taste). Based on this approach, a selection of the following pathogen-protease cleavage products suggests bitterness or not: the first five sequences (sequences #1-5) of Table 2 of [NAGASE, H. &amp; FIELDS, G. B. 1996; Human matrix metalloproteinase specificity studies using collagen sequence-based synthetic peptides. Biopolymers, 40, 399-416], show a Q* in cal/mol of approximately 1400-1700 and e.g. the fourth sequence in Table 2 shows bitter taste. If the cleaved peptide sequence is sufficiently bitter for reliable recognition, the coupling of the flavoring substance is sometimes not necessary in order to elicit a taste sensation in patients, as the peptide fragment is sufficiently mediating a taste itself. 
     Coupling of the Flavoring Substance 
     Coupling of quinine (bitter for gustatory detection and fluorescent for easy testing of cleavage, particularly when the spherical system is deployed) or aspartame, an artificial sweetener to the N-terminal end of the ‘anchor-protease sensitive peptide’ sequence can be performed while still on solid phase (see  FIG. 2 ). Bifunctional linkers can be used to couple quinine to the N-terminal end of the anchor-protease sensitive protein sequence. To avoid rapid cleavage of the linker from quinine in vivo, hydrolytically or enzymatically less sensitive linkages can be installed. In a first approach, a diisocyanate linker like hexamethylene diisocyanate is treated with the free secondary OH-group of quinine forming an urethane bond followed by coupling the linker via its remaining isocyanate group to the N-terminal end of the peptide, forming an urea bond. A second approach consists in the reaction of the quinine double bond with a bis-epoxide (e. g. 1,4-butanediol diglycidyl ether) leading to an ether linked quinine which can be subsequently coupled to solid phase attached protein by N-alkylation. Aspartame, or if necessary a N-protected aspartame, can be coupled via its carboxyl group to the peptide N-terminus by conventional peptide synthesis. After coupling the flavoring molecules to the peptide, the formed conjugates can be cleaved from solid phase, purified and characterized using common analytical methods (FT-IR, NMR, MS). The strategy regarding the anchor is outlined below. 
     Formulation of a Spherical System in a Chewing Gum 
     To prepare peptide-flavoring substance conjugate-bearing spheres, poly(methylmethacrylate) (PMMA) carriers (particle diameter: 17 to 30 μm) with a three-dimensional carboxy group matrix are used. The conjugates synthesized as outlined above are immobilized to the PMMA spheres by conventional peptide formation protocols (e. g. by using water-soluble carbodiimides to activate the carboxyl groups of the PMMA matrix). In cases where conjugates with interfering functional groups are used the disulfide coupling method can be employed as described above. 
     For the coupling of peptides to build up the sensitive peptide sequence the following method was used: 
     Manual Coupling of Amino Acids: 
     After swelling the resin for 30 min in DMF and removing 1 mL 40% piperidine/DMF is added and incubated for 3 min. Then, after removing by vacuum filtration 1 mL 20% piperidine/DMF is added and incubated for 10 min. After removing the resin is washed 6 times with DMF (1 mL, 1 min each). The amino acid (5 eq) is dissolved in 410.90 μL 0.5 M HOBt in DMF and afterwards transferred to the N-terminal-deprotected peptidyl resin. 31.81 μL (8 eq) of DIC is added to the reaction mixture and gently shaken for 1 h. After removing the reaction mixture by vacuum filtration the resin is washed 6 times with DMF (1 mL, 1 min each) and 6 times with DCM (1 mL, 1 min each). After the cleavage of peptides by specific proteases the monoisotopic masses have to be checked with MALDI-MS. Preparative purification by high-pressure liquid chromatography (HPLC) is carried out with a Phenomenex C18 column (21.2-mm internal diameter, 250-mm length, 7-mm particle size) with eluent A (0.2% TFA in water) and eluent B (0.2% TFA in 1:4 water-acetonitrile). The peptides have to be purified with a gradient of 29 to 54% eluent B in 50 min. 
     For the coupling of the flavoring substance to the sensitive peptide sequence the following specific methods can be used: 
     Modification of Hydroxy Group-Containing Flavor Molecules with Anchor Groups 
     Example 1 
     1.5 mmol of the flavor molecule is dissolved in dichloromethane and consecutively 3 mmol of adipic acid, 3 mmol of N,N-dicyclohexylcarbodiimide and 3 mmol of 4-(N,N-dimethylamino)pyridine are added. The mixture is stirred for 24 hours at room temperature. Then, the reaction mixture is washed thoroughly with saturated NaHCO 3  solution, 2N HCl solution and water. The organic phase is isolated, dried over MgSO 4 , and evaporated to dryness under vacuum. The obtained raw material is purified by flash chromatography using a silica gel column and chloroform/methanol as eluent. 
     Example 2 
     3 mmol dodecanedioic acid are stirred at room temperature with 3 mmol of 2,4,6-trichlorobenzoyl chloride and 10 mmol of triethylamine in toluene. After 3 hours stirring, 3 mmol of quinine and 3 mmol of 4-(N,N-dimethylamino)pyridine are added and the mixture is stirred for another 20 hours. The reaction mixture is washed thoroughly with saturated NaHCO 3  solution, and water, and the aqueous phase is washed twice with ethyl acetate. The organic phases are unified and dried over MgSO 4 . After evaporation of the solvent under vacuum, the obtained raw material is purified by flash chromatography using a silica gel column and chloroform:methanol=3:1 as eluent. Yield: 47%, brown oil. IR (ATR, cm −1 ): 2923, 2852, 1738, 1623, 1590, 1505, 1476, 1433, 1357, 1305, 1229, 1157, 1090, 1033, 995, 914, 852, 829, 762, 719. 
     Example 3 
     Step 1: A mixture of 1 mmol of quinine, 1 mmol of 11-bromo-undecanoic acid, 1 mmol of N,N-dicyclohexylcarbodiimide and 1 mmol of 4-(N,N-dimethylamino)pyridine in dry dichloromethane are stirred for 24 h at room temperature. Then, the reaction mixture is washed thoroughly with saturated NaHCO 3  solution, 2N HCl solution and water. The organic phase is isolated, dried over MgSO 4 , and evaporated to dryness under vacuum. The product is further purified by flash chromatography using a silica gel column and methanol as eluent. Yield: 20%, yellow oil. IR (ATR, cm −1 ): 3323, 2924, 2852, 2119, 1738, 1695, 1619, 1571, 1509, 1452, 1357, 1310, 1223, 1167, 1086, 1029, 990, 914, 852, 833, 719, 647. 
     Step 2: 1 mmol of the flavor molecule containing a bromo group is dissolved in DMF and an excess of sodium azide (3 mmol) is added. The mixture is stirred for 20 h at room temperature. After addition of water the reaction mixture is extracted three times with ethyl acetate. The received raw product is further purified by flash chromatography using a silica gel column and chloroform:methanol=3:1 as eluent. 
     Example 4 
     2.5 mmol of the flavor molecule are dissolved in dichloromethane and 0.025 mmol of dibutyltin dilaurate followed by 5 mmol of hexamethylene diisocyanate dissolved in dichloromethane are added. The mixture is stirred for 24 hours at room temperature. After evaporation of the solvent the isocyanate-containing flavor molecule is used without further purification in the next step. 
     Example 5 
     2.5 mmol of the flavor molecule and 5 mmol of poly(ethylene glycol)-diepoxide (molecular weight: 2000 Da) are dissolved in DMSO (20 ml) followed by the addition of 5 mmol KOH. After stirring for 3 hours at room temperature water is added and the mixture is extracted with chloroform. The organic phase is dried over MgSO 4  and after evaporation of the solvent, the resulting product is used without further purification. 
     Modification of Peptides with Anchor Groups 
     Example 6 
     1 mmol of the peptide is dissolved in a dioxane/water mixture (1:1) and 2M NaOH is added until the pH reached 9-10. Under a nitrogen atmosphere, 1.1 mmol 3-butyn-1-yl-chloroformate is added and the mixture is allowed to stir for 18 hours. The product is lyophilised and purified by FCPC using an n-BuOH/H 2 O system. After purification the product is obtained as a white solid. 
     Coupling of the Carboxy Group-Containing Flavor Molecule with the Peptide 
     Example 7 
     A mixture of 1 mmol of the carboxy group-containing flavor molecule from example 1 or 2, 1 mmol of the peptide, 1 mmol of N,N-dicyclohexylcarbodiimide and 1 mmol of 4-(N,N-dimethylamino)pyridine in dry dichloromethane are stirred for 24 h at room temperature. Then, the reaction mixture is washed thoroughly with saturated NaHCO 3  solution, 2N HCl solution and water. The organic phase is isolated, dried over MgSO 4 , and evaporated to dryness under vacuum. The product is further purified using preparative HPLC. 
     Example 8 
     0.5 mmol of the triple bond containing peptide from example 6 and 0.5 mmol of the azide group-containing flavor molecule from example 3 are dissolved in 20 ml of DMF. After addition of the catalyst copper-I-bromide/pentamethyldiethylenetriamine (0.05 mmol), the mixture is stirred for 24 hours at room temperature. After addition of water (150 ml), the mixture is extracted three times with chloroform. The unified chloroform extracts are washed with saturated NaHCO 3  solution, 2N HCl solution and water. The organic phase is dried over MgSO 4  and after evaporation of the solvent the peptide-coupled flavor molecule is obtained as a light yellow solid. 
     Example 9 
     1 mmol of isocyanate-terminated flavor molecule is dissolved in dichloromethane (10 ml) followed by the addition of 0.005 mmol dibutyltin dilaurate. After addition of 1 mmol of the peptide the mixture is stirred for 24 hours at room temperature. The reaction mixture is diluted by adding 10 ml of dichloromethane and washed with saturated NaHCO 3  solution, 2N HCl solution and water. The organic phase is dried over MgSO 4  and after evaporation of the solvent, the resulting raw product is purified using preparative HPLC. 
     Example 10 
     1 mmol of the epoxide-modified flavor molecule and 1 mmol of the peptide are dissolved in DMSO (20 ml). 2 mmol KOH are added and the mixture is stirred for 6 hours at room temperature. Water is added and the reaction mixture is extracted several times with chloroform. The organic phase is washed with saturated NaHCO 3  solution, 2N HCl solution and water. The chloroform extracts are dried over MgSO 4  and after evaporation of the solvent under vacuum, the remaining material is purified using preparative HPLC. 
     For the coupling of flavor molecule-modified peptide to polymer particles the following methods can be used: 
     Example 13 
     The amino group-containing polymer particles (100 mg) are suspended in dichloromethane and a solution of 1 mmol of the peptide in dry dichloromethane is added. After 5 min of stirring, 1 mmol of N,N-dicyclohexylcarbodiimide and 1 mmol of 4-(N,N-dimethylamino)pyridine dissolved in dichloromethane are added and the mixture is stirred 24 h at room temperature. The particles are isolated and washed twice with dichloromethane, ethanol, and water. 
     Example 14 
     The amino group-containing polymer particles (100 mg) and the flavor molecule-containing peptide (1 mmol) are suspended in phosphate buffer saline (10 mg/ml, pH=5-6). After 5 min, 1 mmol 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 0.6 mmol of N-hydroxysuccinimide are added and the mixture is stirred for 4 hours at room temperature. The polymer particles are isolated, washed with deionized water and purified by dialysis against deionized water for 36 hours at room temperature. 
     Suitable purification routines for the spheres have been established as well as analytical techniques to characterize them (particle size after immobilization, mechanical integrity, load capacity). 
     Development of a Spherical System Formulated in Chewing Gum 
     The chewing gum can be selected from sorbitol, mannitol or a combination of these sugars/polyols to result in strong bite strength (low load of spherical system), medium bite strength (caramel like in the beginning, medium load of spherical system), or smooth system (high load of spherical system). This starting material is a free floating powder, allowing easy mixture with other components, including spherical systems such as from above. The average powder particle size is about 200 to 250 μm or even 200 to 340 μm such that particle segregation can sometimes be problematic for spherical systems of diameters less than 20 μm. In cases in which segregation is a problem, one can prepare a pre-mix in Mannitol DC granulate and compact that premix. The powder mixture typically requires a lubricant for compression (e.g. 1.5% magnesium Stearate or 3% Mg-stearat:Talkum (1:1)). Compaction is done on a standard rotary tablet machine (possible advantageous Parameters: Pressing force: 7 KN, Pre-pressure: 2.2 KN, Cylinder height (compression): 2.8 mm, Cylinder height (pre-compression): 3.5 mm, Tablet diameter: 14 mm, Tablet height: 5 mm, Tablet weight: 1.15 gr). Turnover is up to 6,000 chewing gums per hour or at nearly any scale less, allowing pilot scale manufacturing for mitigating production risks for later production of the system in chewing gum. Miniaturized systems are used, allowing rapid formulation screens with lab scale experiments (mini-tablets/chewing gums) as are single-punch tablet machines one of which is equipped with appropriate pressure monitoring systems as a prerequisite for rationale design of tabletting conditions. A typical formulation is compressed from 86.5% or 86.95% Pharmagum® S, 0.5% or 0.05% spherical system, 3% magnesium stearate, 7% sorbitol and 3% sodium carbonate. As an alternative three different Health in Gum® by CAFOSA powder mixtures will be used. Typical formulations contain 92.7% Health in Gum®, 0.05% spherical system, 2.0% powder flavor, 2.0% encapsulated flavor, 1.5% lubricant, 1.0% silicon dioxide, 0.55% liquid flavor and 0.20% intensive sweeteners. 
     Stability tests were performed by exposing the spherical system/chewing gum formulation to different temperature and humidity profiles. The resulting chewing gums were chemically inert and not or only slightly hygroscopic and stable when stored. The formulations did not contain acid components such that re-agglomeration of the gum part while chewing was prevented. The resulting formulations were further characterized in terms of compression force, excipient optimization of the formulations, stability studies, compaction density by mercury porosimeter as well as measurements of hardness, water content and other standard pharmaceutical characterization tests. 
     Establishment of the System&#39;s Performance Against Proteases (Specificity and Sensitivity) 
     For these tests, an in-house machine can be engineered using a tool shop. By reference of the European Pharmacopeia (Pharm.Eur.) monograph for testing of chewing gums, the machine consists of two electronically controlled pistons transmitting twisting and pressing forces as occurring during chewing of a gum. A third vertical piston (‘tongue’) is holding the gum in place. The set-up is integrated into a temperature controlled chamber (40 mL volume) within which 20 mL of unspecified buffer or artificial saliva is placed. The buffer or saliva is spiked with respective protease as outlined below for testing performance (selectivity and specificity) of the spherical system formulated into a chewing gum. Fragments occurring in the buffer or artificial saliva are analyzed by HPLC equipped with a fluorescence detector (in case of quinine decoration, which is strongly fluorescent) or by LC-MS/MS to provide higher sensitivity. 
     In Vitro Testing of System Sensitivity to MMP Challenge 
     The system can be challenged to different proteases and 5 systems can be selected with optimized specificity and selectivity for protease cleavage. 
     Profile system cleavage as in  FIG. 2B , D (coupled to spherical carrier or that coupled spherical carrier formulated into chewing gum) when exposed to Proteases, which can be purchased. Enzyme assays can be conducted to determine kcat/KM values (as substrate concentration is high, the enzyme is saturated and reaction kinetics are, therefore, controlled by kcat) and relative rate for sequence specificity (cross activity among different proteases tested). Cleavage can be assessed through conventional HPLC methods with UV-VIS detection and fluorescence detection where appropriate (fluorescence for e.g. quinine modified systems). Triple stage LC-MS/MS can be used for analysis and characterization of fragments. As fragments are below 1500 amu (m/z), the LC-MS/MS deployed at UWU is capable of robustly assessing these cleavage products with high sensitivity while concomitantly collecting structural data by means of tandem mass spectrometry (MS/MS) for enhanced identification and confirmation. 
     Evaluation of System Functionality/Chewing Gum in Patients, Performing Patient Acceptance Assessment/Gustatory Sensitivity of Flavoring Substances: 
     Patients with suspected inflammation or other pathogen presence can be used. After screening for their eligibility to participate in the study (inclusion/exclusion criteria) they are asked to sign the informed consent form (ICF). Clinical parameters are assessed. Patients with confirmed disease receive either the gustatory sensor in chewing gum or the corresponding “dummy” in a randomized order. Their gustatory response is recorded. Each patient is calibrated for his own correction factor as outlined below. 
     Sample size: At least 20 patients, (sequential study design with each patient being blinded and receiving the gustatory sensor in chewing gum or corresponding dummy with at least 30 minutes waiting time between administrations). 
     Methods: Patients with clinically confirmed elevated pathogen presence are treated with either the “gustatory sensor” in chewing gum (test group; provided in chewing gum as outlined above) and corresponding “dummy” (control group; as verum group with placebo chewing gum) using a predefined randomization list and at least 30 minutes waiting time between treatments. Individual gustatory response is normalized after calibration as outlined below. 
     Gustatory assessment, chewing of gustatory sensor in chewing gum: record patient gustatory experience (bitter taste/no specific taste) after calibration (individual correction factor is determined) of each patient as outlined below. 
     Taste Testing of System: 
     These studies are needed to evaluate the taste of the cleaved peptide sequences carrying the flavoring substance. For that, the truncated peptide sequence representing the “cleaved” part following protease-cleavage of the system and carrying the flavoring substance (see  FIG. 2A ) are tested as outlined below. Phase I is the calibration of each volunteers (determination of correction factor) and phase 2 is the exposure to the peptide fragment carrying the flavoring substance, for which bitterness values are collected as outlined below: The anticipated flavoring substances (bitter) used in this disclosure are not from a single chemical class (e.g. peptides vs. quinine). Bitter substances typically have a ring-bound carbonyl group, which may be part of a lactone ring system with ring opening typically leading to a loss of bitter taste. For assessment of bitter taste, the reciprocal value of the dilution of the bitter substance which is barely noticed as bitter, is taken. Therefore, the bitter value 10,000 means that 1 g of the subject tested and diluted in 10,000 mL water is barely recognized as bitter. The bitter value is determined as the average of 6 single measurements which is performed by 6 volunteers. As this is a biological testing assay, each person must be calibrated before the study commences with an individual correction factor being calculated for each volunteer after calibration has been finished. For that, quinine-HCl with a bitter value of 200,000 is used (dilute 0.1 g quinine-HCl R in 100 mL water R. 1 mL of that solution is taken and diluted to 100 mL with Water R=stock solution. Different volumes of that stock solution are diluted with water R to 10 mL=reference solution). If a volunteer barely tastes this reference solution as bitter, no correction factor is required. In all other cases, a correction factor is determined as follows: Each volunteer receives the same volume of diluted quinine-HCl. If the person is barely not sensing bitterness, the volunteer must keep the solution in his or her mouth for 30 seconds. Exactly 10 minutes must be waited before testing the person again with another dilution. The solution is held at room temperature and before the solution is tasted, the mouth is rinsed by the volunteer with water. During the entire procedure, it is not allowed to eat or smoke other than some unflavored white bread. The correction factor is calculated as of k=n/5 with n being the amount in milliliter of the stock solution barely tasted as bitter. Volunteers who cannot taste a reference solution composed of more than 5.8 mL stock solution diluted to 10 mL with water R are excluded from testing due to missing sensitivity. For testing of the flavoring substances/systems developed here within, the fragments generated after protease cleavage are manufactured and linked to the flavoring substance and these fragments are used for testing. For that, 10 mg of the fragment is dissolved in 1 mL of water R under agitation. After dissolution, this solution is diluted to 100 mL using water R (referred to as solution C1, which as a dilution factor of 100). 10 mL of that solution is diluted with water R to result in 100 mL of solution C2 (dilution factor 1,000) and so on. Starting as of C4, each volunteer determines ones individual bitter threshold level and barely tasted solution, respectively. This barely tasted solution is referred to as D. Using D, the following dilution set is prepared with the volumes always being filled to 10 mL using water R: 1.2, 1.5, 2.0, 3.0, 6.0, 8.0 mL. One determines the amount in mL of solution D, which is barely tasted as bitter. For each volunteer, the bitter value is calculated as follows: (Y*k)/(X*0.1), with Y being the individual dilution factor of Cn=D having been barely recognized as bitter, k being the correction factor as outlined above and X being the amount of mL of solution D, which has been recognized as bitter. The procedure is linked to an error of about 20-30%, which is respected during data interpretation. 
     LIST OF REFERENCE SIGNS 
     
         
           1  flavoring substance 
           2  linker element 
           3  substrate and/or anchor 
           4  pathogen specific and pathogen released protease trigger 
           5  released flavoring substance 
           6  colorant substance in first state 
           7  colorant substance in second coloured state