Patent Abstract:
the invention relates to boswellia frereana and particularly an extract of same for treating a range of inflammatory disorder or conditions selected from the group comprising : inflammatory bowel disease , all forms of muscular dystrophy especially duchenne muscular dystrophy , sepsis , sepsis syndrome , osteoporosis , ischemic injury , graft vs . host disease , reperfusion injury , asthma , diabetes , cancer , myelogenous and other leukemias , psoriasis and cachexia , alzheimer &# 39 ; s disease , demyelinating neurological disorders including multiple sclerosis , acetylcholinesterase mediated disorders , retinal disorders , neurological , retinal , and muscular disorders .

Detailed Description:
all reagents were purchased from sigma ( poole , u . k .) unless otherwise specified . culture medium consisted of dulbecco &# 39 ; s modified eagle &# 39 ; s medium ( dmem glutamax i ™/ hams f12 media ( 1 : 1 ), invitrogen , uk ) supplemented with 100 units / ml penicillin , 100 μg / ml streptomycin , 50 μg / ml l - ascorbate - 2 - phosphate and 1 × insulin - transferrin - sodium selenite ( its ). somali frankincense oleoresins , boswellia frereana ( somali name maidi ) and boswellia carteri ( somali name beyo ) were procured from hargeysa in somaliland ( northern somalia ). ethiopian frankincense ( boswellia papyrifera ) was kindly supplied by mr abdi farah ( somaliland frankincense company , cardiff ). the solvents absolute ethanol and hexane ( analar grade ) were purchased from fischer scientific ( loughborough ). gum resin from boswellia frereana was collected and the active component ( s ) prepared by extracting the gum resin ( 20 g ) successively with ethanol ( 100 %) for 7 days in a light - impermeable vessel . insoluble gum resin was removed by filtration and the solvent evaporated at 60 ° c . more specifically , a known amount of b . frereana oleoresin ( 20 g ) was accurately weighed , placed in a 500 ml glass beaker and 100 ml of ethanol added . the mixture was stirred with a spatula , covered with aluminum foil and para - film and then left to stand for seven days . the ethanol extract was filtered using a 150 ml express ™ millipore filter . the solvent was evaporated under a gentle stream of nitrogen at a temperature of 60 ° c . the resulting b . frereana extract was dissolved in ethanol at a concentration of 10 mg / ml to give the working stock and stored at − 20 ° c . the chemical constituents of the b . frereana extracts were analysed by gas chromatography - mass spectrometry ( gc - ms ) using an agilent technologies 6890n gas chromatograph equipped with an agilent 5973 network mass selective detector and an agilent 7683 series autosampler . ( see fig6 ). a scan range of 35 to 450 mass units was used for acquiring the mass spectra data with a sampling time of 2 which corresponds to 3 . 5 scans per second . data acquisition was performed using the msd chemstation ™ computer software . the identification of the individual peaks was conducted by comparing sample mass spectra to those stored in the national institute of standards and technology ( nist ) library database which contains over 54 , 000 spectra and by comparison of the sample mass spectra to published literature values . national institute of standards and technology is a physical science research laboratory and an agency of the u . s . department of commerce . ( website — www . nist . gov ). an alternative mass spec . library is commercially available from wiley ( website — www . sisweb . com / software / ms / wiley . htm # wiley8 ). chemical characterisation : comparison of the resin and gum content of oleoresins b . frereana b . carteri and b . papyrifera boswellia oleoresin granules from b . carteri , b . frereana and b . papyrifera , were separately ground to a powder with a mortar and pestle . 40 g of each oleoresin powder was placed in separate 500 ml glass beakers and 100 ml of absolute ethanol added to each beaker . the mixtures were stirred with a spatula , covered with aluminum foil and para - film and then left to stand for three days . after this time period the ethanol extracts were stirred and then filtered under vacuum , using a 150 ml express ™ millipore filter . the weight of ethanol insoluble gum ( polysaccharide ) left on each filter was recorded and the filtered ethanol extracts stored at − 20 ° c . gum resin from boswellia frereana ( 20 g ) was extracted using hexane as solvent for 3 days in a light - impermeable vessel . insoluble gum resin was removed by centrifuging at 2000 rpm for 30 minutes and the clear supernatant layer removed . the hexane solvent was evaporated under a gentle stream of nitrogen at a temperature of 40 ° c . and stored at − 20 ° c . deionised water ( 1 litre ) was placed in a steam distillation apparatus , via the bottom glass vessel , and 50 . 6 g of b . frereana oleoresin placed in the top glass vessel . the two glass vessels were physically separated only by a perforated metal gauze . the heating mantle was set on maximum power and the water heated to boiling . the distillate ( 300 ml ) was collected in a 500 ml glass container , 100 ml of hexane added and the mixture shaken . the hexane layer ( top layer ) was removed , transferred to a clean container and the solvent evaporated off under a gentle stream of nitrogen to yield an aromatic yellow oil ( 0 . 44 g ). full - depth articular cartilage ( 6 mm diameter explants ) was harvested from the metacarpo - phalyngeal joint of 7 - day old bovine calves using a biopsy punch . cartilage explants were stabilised for 3 days in culture medium prior to treatment . an in vitro cartilage degradation model , as characterised by aggrecan loss and type ii collagen proteolysis ( 29 , 30 ), was established by treating cartilage explants with 5 ng / ml human recombinant il - 1α ( peprotech , u . k .) and 10 ng / ml human recombinant oncostatin m ( osm ; peprotech , u . k . ), in the presence or absence of 100 μg / ml b . frereana extract ; untreated explants served as a control . cultures were maintained over a period of 28 days , with replenishment of media and / or treatments every 3 days . tissue and media were harvested after 3 , 7 , 14 , 21 and 28 days of culture . cartilage explants were freeze dried over a period of 48 hours and all biochemical data normalised to dry weight of tissue ( mg ). for mrna analysis , explants were cultured with the treatments indicated above for 3 days to allow investigation of early gene changes . explants were snap frozen in liquid nitrogen prior to rna extraction . cell viability was assessed using the cytotox 96 ® non - radioactive cytotoxicity assay ( promega ) ( 31 ). the enzymatic assay quantitatively measures lactate dehydrogenase levels in culture medium as a consequence of cell lysis i . e . through cell death . culture media ( 50 μl ) was pipetted into a 96 - well plate and mixed with 50 μl reconstituted substrate mix ( kit component ). after 30 minutes incubation at room temperature avoiding light , absorbance values were determined at 492 nm using a plate reader . sulphated glycosaminoglycans ( sgag ) levels in the tissue explants and released into the media was determined using the dmmb assay ( 32 ). tissue explants ( 50 mg tissue : 1 ml buffer ) were placed in digestion buffer ( 20 mm sodium phosphate ( ph 6 . 8 ), 1 mm edta , 2 mm dtt ) containing 300 μg papain ( non - specific matrix proteinase ). samples were incubated at 60 ° c . for 1 hour , or until the tissue had completely dissolved . 10 mm iodoacetamide was added to the samples to alkylate the reactive sulphydryl groups ( generated by dtt treatment ) and the samples made up to a final volume of 5 ml ( 50 mm tris ( ph 8 . 0 ). a serial dilution was prepared using whale chondroitin - 4 - sulphate ( sulphate c ) with standards ranging from 0 - 50 μg / ml . standards were prepared in the same buffer as the samples under analysis i . e . for media — dmem - glutamax i ™, and for tissue extracts — extraction buffer ( 50 mm tris ( ph 8 . 0 )). 40 μl of standards and samples were pipetted in triplicate into a 96 - well plate followed by addition of 2000 dmmb reagent ( 1 . 6 % ( w / v ) 1 , 9 - dimethylmethylene blue , 3 % ( v / v ) sodium hydroxide , 1 % ( v / v ) ethanol , 0 . 35 % ( v / v ) formic acid ). the plate was read immediately at a wavelength of 525 nm , and sgag concentrations determined from reading directly off the standard curve . any samples with a reading outside the limits of the standard curve were diluted in their respective buffer , the standards pipetted into fresh wells and the samples re - assayed . the amount of collagen in and released from the cartilage was determined using the hydroxyproline assay using an adaptation of the method by woessner ( 31 ). briefly , tissue explants and media samples were hydrolysed in 12n or 6n hcl , respectively , at 110 ° c . for 24 hours and samples freeze - dried . a standard curve was prepared by dissolving 4 - hydroxyproline in dmem - glutamax i ™ to give a range of 1 - 10 μg / ml . hydrolysates ( 30 μl ) and standards were added in triplicate to a 96 - well plate followed by 70 μl diluent ( 66 % ( v / v ) isopropanol ) and 50 μl oxidant ( 18 mm chloramine t , 50 % ( v / v ) stock buffer ) before incubation at room temperature for 5 minutes . colour reagent ( 3 . 7 mm dimethylamino benzaldehyde , 15 % ( v / v ) perchloric acid , 85 % ( v / v ) isopropanol ) was added ( 1250 and incubated at 70 ° c . for 40 minutes . the absorbance was detected ( 540 nm ) and the hydroxyproline content calculated from the standard curve . any samples with a reading outside the limits of the standard curve were diluted in their respective buffer , the standards pipetted into fresh wells and the samples re - assayed . total collagen was calculated by multiplying the hydroxyproline values by a factor of 7 . 14 ( 33 ). the expression and activation of mmps 2 and 9 were evaluated in experimental media samples by gelatin zymography ( 34 ). media samples were denatured in a doubling dilution sample buffer ( 60 mm tris ( ph 6 . 8 ), 2 % ( w / v ) sds , 10 % ( w / v ) glycerol , 0 . 01 % ( w / v ) bromophenol blue ) at 60 ° c . for 30 minutes . briefly , samples were loaded onto a 7 . 5 % ( w / v ) sds polyacrylamide gel containing 0 . 5 mg / ml porcine gelatin ( bdh , poole , uk ), and run in 1 × laemmli buffer ( 25 mm tris , 0 . 192m glycine , 0 . 1 % sds ) at 150v for approximately 60 minutes or until the dye front was nearing the end of the gel . samples were loaded on an equivalent dry weight value taking into account differences in the volume of accumulated media over the 28 day culture . gels were washed 3 times in 2 . 5 % triton x - 100 to remove sds and allow enzyme renaturation . gels were incubated overnight in mmp proteolysis buffer ( 50 mm tris ( ph 7 . 8 ), 50 mm cacl 2 , 0 . 5m nacl ) at 37 ° c . to activate latent enzymes . gels were subsequently stained ( 0 . 25 % ( w / v ) coomassie brilliant blue r - 250 , 10 % ( v / v ) glacial acetic acid , 45 % ( v / v ) methanol ) for 1 hour . cleared zones of gelatinolytic activity were observed upon destaining ( 7 . 5 % ( v / v ) glacial acetic acid , 10 % ( v / v ) methanol ) for at least one hour or until zones of gelatinolysis were evident . their relative quantities were analysed by scanning densitometry ( umax magic scan ) and nih image software ( nih , bethesda , md .). absolute concentrations of nitrite , a stable end - product of no , were determined in the culture media using the griess assay ( promega ). a nitrite standard curve was generated using a 0 . 1m sodium nitrite stock solution ( kit component ). the solution was diluted to a concentration of 100 μm ( using dh 2 o ), and a two - fold serial dilution performed ( standards ranging from 1 . 56 μm to 100 μm ). media samples ( 50 μl ) were pipetted in triplicate into a 96 - well plate , 50 μl of sulphanilamide solution added and the plate incubated at room temperature for 10 minutes . ned solution ( 50 μl ) was added to each well and the absorbance was detected at a wavelength of 540 nm . nitrite ( μm ) was determined by comparison with the nitrite standard curve . any samples with a reading outside the limits of the standard curve were diluted in their respective buffer , the standards pipetted into fresh wells and the samples re - assayed . pge 2 production was measured in the culture media using a high sensitivity elisa ( pge 2 hs - eia ; cambridge biosciences ). pge 2 standards were prepared from a 50 ng / ml stock solution ( kit component ) to give a standard curve ranging from 20 pg / ml to 640 pg / ml . standards , negative controls and media samples ( 100 μl ) were pipetted in triplicate into a 96 - well plate followed by the addition of 50 μl of pge 2 hs - eia peroxidise conjugate . pge 2 hs - eia antibody ( 50 μl ) was added to each well and the plate incubated overnight at 4 ° c . the contents of the plate were removed and the wells washed three times with 400 μl wash buffer ( kit component ). after removal of the wash buffer , 200 μl of pnpp substrate was added to each well and the absorbance measured at a wavelength of 450 nm using a plate reader . absorbances were standardised by subtracting the absorbance of the negative control . a logarithmic plot of pge 2 standards versus absorbance was performed , and the concentration of pge 2 in the samples calculated . any samples with a reading outside the limits of the standard curve were diluted in their respective buffer , the standards pipetted into fresh wells and the samples re - assayed . cartilage explants were homogenised in 1 ml of trizol ™ reagent ( invitrogen ) in liquid n 2 ( 2000 rpm , 1 . 5 minutes ) using a dismembrator ( b . braun biotech int ., germany ), total rna extracted and cdna generated as previously described ( 35 , 36 ). briefly , 175 μl chloroform was added to the trizol ™ containing the homogenised cartilage , mixed by inversion several times and incubated at room temperature for 5 minutes . the rna - containing phase was collected by centrifuging the samples ( 14 , 000 rpm , 15 minutes , 4 ° c .) and removing the upper aqueous component to a sterile eppendorf . an equal volume of isopropanol was added to the rna - containing aqueous phase , the tube inverted several times to mix and the rna precipitated overnight at − 20 ° c . the rna was pelleted by centrifuging the samples ( 14 , 000 rpm , 15 minutes , 4 ° c . ); the supernatant was removed and the pellet washed with 1 ml 75 % ethanol . the rna was pelleted by centrifugation ( 14 , 000 rpm , 5 minutes , 4 ° c . ), the supernatant discarded and the rna - containing pellet air - dried at room temperature for approximately 30 minutes or until the ethanol had completely evaporated . samples were dnase - treated ( 1 u dnase , 10 % ( v / v ) dnase buffer ) at 37 ° c . for 30 minutes . the residual dnase components were removed by adding 10 % ( v / v ) dna - later ( ambion ) followed by centrifugation ( 10 , 000 rpm , 2 minutes ) to pellet out the contaminants ; the rna remains in the supernatant . first strand cdna was synthesised ( 20 μl reaction volume ) using superscript ™ iii reverse transcriptase ( invitrogen ). briefly , 1 μg random primers and 500 μm dntps were added to 10 μl rna and incubated at 65 ° c . for 5 minutes . after adding 5 × first strand buffer , 200 mm dtt and 10 u recombinant rnase inhibitor ( promega ), the sample was incubated at 42 ° c . for 2 minutes . 200 u superscript ™ iii reverse transcriptase ( invitrogen ) was added to the sample and incubated for 50 minutes at 42 ° c . ; the reaction was terminated by heating the sample to 70 ° c . for 15 minutes . real - time pcr was carried out using an mx3000 ® qpcr system ( stratagene ). a real - time qpcr assay , based on sybr green ® detection , was designed for the transcriptional profiling of inos , pge 2 synthase , cox - 2 ( 37 ) and mmp 9 in the cdna samples , after normalisation to the housekeeping gene 18s ( 38 ). primers were designed to the open reading frame of inos , pge 2 synthase and mmp 9 using primer3 primer design software ( frodo . wi . mit . edu / cgi - bin / primer3 / primer3 www . cgi ) ( table 1 ). briefly , 12 . 5 μl of sybr ® green jumpstart ™ taq readymix buffer was added to 100 nm of each primer and 10 cdna and the reaction made up to a final volume of 25 μl with dh 2 o . samples and negative controls ( omitting cdna template ) were loaded into a 96 - well microplate ( stratagene ) and the pcr reaction controlled by mxpro ™ qpcr software . all reactions were carried out at an annealing temperature of 60 ° c . relative quantification was calculated using the 2 − δδc t method as described previously ( 39 , 40 ), using the untreated controls as a reference group to quantify relative changes in target gene expression . the data are presented as fold change in gene expression normalised to an endogenous reference gene 18s relative to the untreated control cdna samples . where there was no amplification of a gene product in the untreated cartilage cdna samples , the fold change in gene expression was relative to the il - 1α / osm treated cdna samples . data were normalised to the dry weight of the cartilage explants and presented as mean ± standard error mean ( n = 4 explants per treatment ). each experiment was repeated three times and representative data are shown . data were tested for normality ( anderson - darling ) and equal variances prior to parametric analyses ( minitab ). statistical analysis was performed using a 2 - factor generalised linear model anova and tukey &# 39 ; s post hoc test , or where indicated in the text using a 2 - sample t - test ( qpcr analysis ). differences were considered significant at p values less than 0 . 05 . thus tlc method for screening ache activity is based on that reported by rhee et al ( 56 ) and is a modified version of ellman &# 39 ; s original uv method for determining ache activity ( ellman et al ., 57 ). acetylcholinesterase ( ache , 1000 u ) from electric eel , trizma base , acetylthiocholine iodide ( atci ), 5 , 5 ′- dithiobis -( 2 - nitrobenzoic acid ) ( dtnb , ellman &# 39 ; s reagent ) and galanthamine hydrobromide were all purchased from sigma - aldrich ( poole , dorset ). toluene and ethyl acetate were purchased from fisher scientific ( loughborough , leicestershire ). 6 . 057 g of tris base ( molecular weight 121 . 14 g ) was accurately weighed into a 1 litre volumetric flask . 800 ml of deionised water was added , it &# 39 ; s ph adjusted to ph8 with concentrated hcl and then diluted to volume with de - ionised water . buffer was stored at 4 ° c . preparation of acetylcholinesterase iodide ( 2 . 5 mm )/ 5 , 5 ′- dithiobis -( 2 - nitrobenzoic acid ) ( dtnb ) ( 2 . 5 mm ) spray mixture 72 . 2 mg of atci and 100 . 8 g of dtnb were accurately weighed into the same 100 ml volumetric flask and diluted to volume with buffer and stored at 4 ° c . the contents of ache vial ( 1000 u ) was transferred to a 250 ml volumetric flask and siluted to volume with buffer . solution was stored at a − 20 ° c . until required . a stock solution of boswellia frereana ethanol extract ( 101 . 6 mg / ml ) were diluted in ethanol yielding final b . frereana concentrations of 101 . 6 , 50 . 8 , 25 . 4 , 12 . 7 , 6 . 35 and 3 . 17 mg / ml . galanthamine hydrobromide ( 10 mg ) was accurately diluted with 27 ml of methanol . a silicagel 60 f 254 with the dimensions 200 mm × 200 mm and thickness 0 . 2 mm was purchased from vwr international ( west sussex ). 90 ml of toluene and 10 ml of ethylacetate were added together and mixed together . 0 5 ml of anisalaldehyde was transferred to a 100 ml volumetric flask and 10 m ! of glacial acetic acid added . to this 85 ml of methanol was added followed by 5 ml of concentrated sulphuric acid and then shaken to mix . 100 μi of the boswellia extracts were applied to the tic plates as well as 100 μl of galantamine hydrobromide ( 1 mm ) as a reference solution . the tic plate was developed using toluene and ethyl acetate ( 90 : 10 ) as the solvent . after drying for 30 minutes the plate was sprayed with 20 ml of the substrate / dye mixture ( atci / dtnb ) until saturated . the plate was allowed to dry for 5 minutes before spraying with 20 ml of the enzyme solution and then allowed to dry . the plate was photographed within 10 - 20 minutes although the white spots remained for 1 hour . a positive spot was obtained if a white spot was observed on a yellow background . a control tlc plate ( with no samples ) was developed , to investigate false positives , and treated as described for the treated tlc plates . tlc components were also detected by spraying developed tlc plates with anisaldehyde solution . anti - tumour properties of boswellia frereana extracts on human breast cancer cell lines ( mcf7 ) research was carried out using the human breast cancer cell line mcf - 7 ( donated by dr richard clarkson , cardiff university , originally from ecacc ). the human breast cancer cell line mcf - 7 was established in 1970 from the pleural effusion from a 69 year old caucasian female suffering from a breast adenocarcinoma ( 58 ). this cell line has been used extensively as an experimental tumour model . mcf - 7 cells were grown in minimum essential medium eagle ( emem ) with earle &# 39 ; s balanced sat solution without l - glutamine ( lonza ) which was supplemented with 1 % glutamine ( invitrogen ), 0 . 1 % insulin ( sigma ), 1 % penicillin and streptomycin ( invitrogen ), 10 % foetal bovine serum ( sigma ), 1 % non - essential amino acids ( lonza ) and 1 % sodium pyruvate ( ambrex ). they were grown in adherent culture using 75 cm 2 flasks ( costar ) at 37 ° and in an atmosphere of 5 % co 2 in air . cells were sub - cultured every 7 days and seeded at 2 × 10 4 cells per cm 2 . to harvest the cells , first the culture medium was removed . next the cell layer was gently rinsed with approximately 7 ml of 0 . 25 % trypsin with edta ( gibco ) to remove any remaining growth medium . then a further 5 ml of trypsin / edta was added and the flask was incubated for 3 minutes to separate the cells and detach from the surface of the flasks . an inverted microscope ( nikon diaphot ) was used to check that the cells have detached . 10 ml of medium was then added to the flask and gently pipetted up and down to separate the clumps of cells . the cells were counted using a bright line haemocytometer cell counting chamber and seeded into flasks containing a total of 20 ml of medium each . flasks were then placed into the incubator to allow cells to stick . medium was changed once a week . the celltiter 96 aqueous non - radioactive cell proliferation assay ( promega ) kit was used to perform the mts assays . the kit contains 20 ml mts solution and 1 ml pms solution . all mts assays were performed in 96 well plates ( costar ). the cells were seeded at 1 0 . 2 × 10 3 - 1 . 5 × 10 5 cells / cm 2 with 0 . 1 - 0 . 2 ml of appropriate growth media . control wells in all cases contained the same volume of medium , the same volume of test reagent and the same volume of mts solution but contained no cells . the plates were then incubated . cell suspension and mts solution were added to the wells using either a repetitive pipette ( handystep ) or a multi - channel pipette and trough ( transferpette ). ceil suspension in the trough was regularly stirred with a sterile spatula to avoid cells settling to the surface , 24 - 48 hours after seeding 50 μl of test reagent was added as appropriate . 24 - 168 hours after seeding mts solution was added at 20 μl mts solution per 100 μl of medium to the wells with and without cells . the plates were then returned to the incubator for two hours . next the plates were removed from the incubator and shaken using an orbital plate shaker ( msi minishaker ika ) for ten seconds to ensure the reaction product was evenly distributed in the well . the absorbance was then read at 492 nm using either an anthos reader 2001 ( labtech ) plate reader or a fluostar optima ( labtech ) plate reader . in the case of the growth curves the medium was changed at 72 hours and every 24 hours following this so that medium depletion would not act as a confounding variable . to remove the medium from the wells a sterile swab was placed on top of the plate which were then both inverted . the medium was absorbed by the sterile swab and any remaining medium was removed by dabbing on another sterile swab . fresh medium ( 0 . 2 ml ) was then pipetted into all of the test and control wells . an ethanol extract of b . frereana ( 3 . 01778 g ) was dissolved in 10 ml of absolute ethanol ( fisher scientific ) to give a stock solution of 266 . 7 mg / ml . this was then filtered using a sartorius ptfe membrane ( fisher scientific uk ) to ensure sterility . the stock solution was diluted in medium to give 3 times the final concentration needed and 50 μl of this concentrate was added to wells containing 0 . 1 ml of medium to give a final concentration of 88 - 2000 ug / ml in the well . the samples were then vortexed to disperse the extract in the medium . the ethanol concentration was adjusted to be constant in all wells . the concentration was adjusted to contain the same concentration as the well containing the highest concentration of the b . frereana extract . this ranged from 0 . 17 - 0 . 77 % non - specific background absorbance can occur in culture medium incubated with mts solution . this was corrected for using control wells which were identical to test wells but contained no cells . the average absorbance from these control wells was subtracted from all other test well absorbance values to yield corrected absorbance . these corrected absorbance values were used to plot formazan absorbance on the graphs . error bars express standard error of the difference ( se ( d )) between the test wells and control wells and were calculated using the following equation : ld 50 values were calculated as the concentration of the b . frereana extract at which there was a 50 % reduction in formazan absorbance . graphs were plotted using the mean formazan absorbance and were displayed as a percentage of the absorbance at 0 μg / ml . the ld 50 was taken at 50 % formazan absorbance at each sampling time ( 24 , 48 and 72 hours after incubation with b . frereana extract ) on the curves . this was done for each experiment and the average at each incubation time was recorded in the results . two - way anova and three - way anova were performed by means of the general linear model , tukey simultaneous pair wise comparison was used to compare the means . if the variances were not homogeneous ( as verified using the bartlett &# 39 ; s test ) a weighted regression was used . the weights used were the reciprocal of the variance ( 59 ) surprisingly the b . frereana oleoresin was found to be almost completely soluble in both hexane and ethanol resulting in very high extraction yields for the resin ( 99 %), as indicated in table 2 . tables 2 and 3 indicate that b . frereana oleoresins contain very little ethanol insoluble gum ( polysaccharide ). this is in contrast to other species of boswellia such as b . carterii and b . papyrifera , where the ethanol insoluble gum fraction comprised 48 % and 51 % respectively as shown in table 2 . boswellia oleoresins from india ( b . serrata ) has also been reported to contain a substantial amount of alcohol insoluble gum fraction , in the region of 24 % ( 55 ). unlike the oleoresins from b . carteri , b . serrata and b . papyrifera this particular species of boswellia ( b . frereana ) was found not to be amenable to steam distillation due to its low gum content . on contact with the steam the resin softened and completely passed through the perforated gauze and into the hot water . the method for isolation of the essential oil was therefore in actuality one of hydro - distillation rather than steam distillation . the essential oil content of b . frereana , using hydro - distillation was quite low ( 0 . 87 %) as indicated in table 5 . non - polar solvents such as hexane are commonly used , in phytochemistry , to extract the volatile oil component from oleoresins whilst ethanol is commonly used to extract the more polar resin fraction of oleoresins . we have previously used hexane to isolate the volatile oil component of related aromatic oleoresins such as frankincense ( b . carterii , b . papyrifera ), opoponax ( commiphora guidotti ) and myrrh ( commiphora molmol ) whilst leaving the resin and gum content of the oleoresins intact . unexpectedly , in this case , hexane is not suitable for the extraction of the volatile oil component of b . frereana as the solvent also extracted the resin component . see fig7 . treatment of cartilage explants with 5 ng / ml il - 1α and 10 ng / ml osm or 100 μg / ml b . frereana , separately or in combination did not significantly affect cell viability over the 28 day culture period ( data not shown ). b . frereana does not affect sgag levels in an in vitro model of cartilage degradation . treatment of explants with 5 ng / ml il - 1α and 10 ng / ml osm , separately or in combination with 100 μg / ml b . frereana had no effect on sgag levels in the tissue ( fig1 a ). in contrast there was a significant increase in the amount of sgags detected in the media of explants treated with il - 1α / osm relative to those that were left untreated or treated with b . frereana alone ( p & lt ; 0 . 01 ; log transformation required for analysis of days 3 and 7 data ). b . frereana did not rescue cytokine - induced sgag loss from the cartilage explants over the culture period ( fig1 b ). b . frereana reduces collagen release in an in vitro model of cartilage degradation . there were no appreciable differences in the amount of collagen measured in the explants across treatments ( fig2 a ). significantly more collagen was released into the media from cartilage explants treated with il - 1α / osm after 28 days in culture compared to the untreated or b . frereana treated explants ( p = 0 . 001 ; log transformation ). however , there was a significant reduction in collagen released from cartilage explants treated with il - 1α / osm in combination with b . frereana ( p = 0 . 012 ; log transformation ) returning levels to basal amounts ( fig2 b ). b . frereana inhibits cytokine - induced mmp 9 expression and activation , due to a reduction in mmp 9 transcription , in an in vitro model of cartilage degradation . in untreated explants , there was minimal expression of pro - mmp 9 after 7 days , but pro - and active - mmp 2 were observed in both the untreated and b . frereana treated explants ( fig3 a ). il - 1α / osm - stimulated cartilage synthesised significantly higher levels of pro - mmp 9 after 7 days ( p & lt ; 0 . 0001 ; log transformation ). active - mmp 9 was not observed at this time point . pro - and active - mmp 2 levels did not alter appreciably after il - 1α / osm stimulation . interestingly , b . frereana inhibited cytokine - induced pro - mmp 9 synthesis ( p & lt ; 0 . 0001 ; log transformation ), but had no effect on the expression or activation of pro - mmp 2 . after 28 days in culture , pro - mmp 9 was no longer observed in the untreated cartilage explants , but both pro - and active mmp 2 were present ( fig3 b ). these observations were also evident in cartilage treated with b . frereana . overall , b . frereana abolished cytokine - induced mmp 9 expression and activation . there was a dramatic reduction in the amount of pro - mmp 9 expressed by the explants treated with il - 1α / osm in combination with b . frereana which was highly significant from day 7 onwards . as a consequence of reduced mmp 9 synthesis , levels of active mmp 9 were abolished bringing expression levels back to that of untreated explants . it also appeared to reduce il - 1α / osm - mediated pro - mmp 2 expression but this did not reach significance ( p = 0 . 06 ; log transformation ). however , b . frereana did significantly counteract the activation of pro - mmp 2 by il - 1α / osm ( p = 0 . 04 ; ranked log transformation ). only media removed from explants after 7 and 28 days have been included in the manuscript to maintain brevity but are representative of the trends observed over all of the time points . as mmp 9 protein expression was sensitive to treatment , mmp 9 mrna levels were quantified in tissue which had been treated for 3 days ( fig3 c ). mmp 9 mrna was below the limit of detection in both untreated and b . frereana treated cartilage explants . however , b . frereana reduced il - 1α / osm - induced mmp 9 transcription by almost 50 %, although this did not quite reach significance ( p = 0 . 079 ; 2 - sample t - test ). b . frereana reduces cytokine - induced nitrite production and supresses inos mrna expression in an in vitro model of cartilage degradation . the amount of nitrite produced by the untreated explants , and explants treated with b . frereana was low (& lt ; 5 μm / mg dry weight tissue ) and did not change appreciably over the 28 day culture period ( fig4 a ). as expected , cytokine treatment significantly increased production of nitrite after 3 ( p & lt ; 0 . 0033 ), 7 ( p = 0 . 0009 ), 14 ( p & lt ; 0 . 0029 ), 21 ( p & lt ; 0 . 0001 ) and 28 days ( p & lt ; 0 . 0001 ) relative to untreated explants ( log transformation of data ), but b . frereana , significantly inhibited il - 1α / osm induced nitrite production after 14 ( p = 0 . 003 ), 21 ( p = 0 . 0007 ) and 28 days ( p = 0 . 001 ) ( log transformation of data ). inos mrna expression levels were quantified to determine whether the reduction in nitrite at the later time points might be attributed to transcriptional inhibition early on in the culture period ( fig4 b ). there were variable but minimal amounts of inos mrna in untreated cartilage explants after 3 days in culture . inos mrna was not detected in cartilage treated with b . frereana . as expected , there was an approximate 50 - fold increase in inos mrna levels in il - 1α / osm - stimulated explants relative to the untreated controls ( p & lt ; 0 . 0001 ; log transformation ), which was reduced by approximately 75 % in the presence of b . frereana ( p = 0 . 02 ; log transformation ), consistent with the levels of nitrite observed in the culture media . b . frereana reduces cytokine - induced pge 2 production and supresses both pge 2 synthase and cox - 2 mrna expression in an in vitro model of cartilage degradation . the amount of pge 2 produced by the untreated explants and explants treated with b . frereana did not change appreciably over the 28 day culture period (& lt ; 25 pg / mg dry weight tissue ) ( fig5 a ). as expected , cytokine treatment significantly increased pge 2 production after 3 ( p = 0 . 012 ; log transformation ), 7 ( p = 0 . 0002 ), 14 ( p = 0 . 006 ; log transformation ), 21 ( p & lt ; 0 . 0001 ; log transformation ) and 28 days ( p & lt ; 0 . 0001 ; log transformation ) relative to untreated explants , ranging from 100 - 1000 pg / mg dry weight tissue . in the presence of b . frereana , there was a significant inhibition of il - 1α / osm - induced pge 2 production in explants after 7 ( p = 0 . 03 ), 21 ( p = 0 . 005 ; log transformation ) and 28 days of treatment ( p = 0 . 0005 ; log transformation ); however this did not return to basal levels . pge 2 synthase mrna expression levels were also quantified to determine whether the reduction in pge 2 observed over the culture period might be attributed to inhibition of pge 2 synthase transcription ( fig5 b ). pge 2 synthase mrna was not detectable in either the untreated cartilage or in the tissue treated with b . frereana after 3 days of culture . il - 1α / osm stimulated pge 2 synthase mrna expression in the cartilage , and this was reduced by almost 60 % when cytokine - stimulated explants were co - treated with b . frereana ( p = 0 . 007 ; 2 - sample t - test ). in conjunction , mrna levels of cox - 2 — the rate - limiting enzyme in pge 2 synthesis was also quantified . minimal amounts of cox - 2 mrna were observed in untreated cartilage , and levels were undetectable in cartilage treated with b . frereana ( fig5 b ). there was a significant 12 - fold increase in cox - 2 mrna levels in il - 1α / osm - stimulated explants relative to untreated cartilage ( p & lt ; 0 . 0001 ), which was reduced by approximately 75 % when co - treated with b . frereana ( p = 0 . 0001 ). approximately 81 % of the components present in the ethanol extract of b . frereana were identified using gc - ms as indicated ( fig6 ). the major component identified , and accounting for 59 . 3 % of the b . frereana extract was epi - lupeol ( fig6 b ). other minor components identified in the ethanolic b . frereana extract were β - amyrin ( 6 . 35 %), lupeol acetate ( 3 . 10 %), α - amyrin ( 2 . 38 %), α - phellandrene dimer 3 ( 1 . 10 %), α - phellandrene dimer 5 ( 0 . 24 %), α - thujene ( 0 . 34 %) and α - phellandrene ( 0 . 24 %). the extracts of b . frereana , after spraying with the enzyme , substrate and detection reagent were found to yield bright white spots on the tlc plates a yellow background . they were able to inhibit the activity of acetylcholinesterase at all the concentrations tested ( 101 . 6 - 3 . 17 mg / ml ). the reference standard galanthamine hydrobromide ( 1 mm ), a known inhibitor of ache , also gave a bright white spot on the baseline of the tlc plate . no white spots , corresponding to false positives , were observed for the control tlc plate . concentrations of the b . frereana extract at 800 pg / ml or greater resulted in a decrease in formazan absorbance , indicating a reduction in mitochondrial activity and a reduction in cell number . this decrease in cell number could have occurred if the active components of the boswellia extract were to cause cell cycle arrest ( cytostasis ). prolonged cell cycle arrest in a phase other than go is intolerable to the cell and will ultimately result in indirect cellular damage and cell death . the cytotoxic components of the b . frereana extract may , therefore , be behaving as an apoptotic inducer and an enhancer of cell death towards the mcf - 7 human cancer cells . in the present study , we utilised an in vitro model of cartilage degeneration ( 29 , 30 ) to determine whether the little known boswellia species — b . frereana had any anti - inflammatory efficacy , and therefore could be exploited as an alternative therapy for treating a variety of inflammatory disorders . cartilage explants were treated with 5 ng / ml il - 1α and 10 ng / ml osm over a 28 - day period , in the presence or absence of 100 μg / ml b . frereana . there was no evidence of either il - 1 / osm or b . frereana - induced cytotoxicity over the 28 day culture period . in this in vitro model , neither the cytokines nor the b . frereana had any discernable effect on the amount of sgag or collagen retained in the explants . however , there was a significant increase in the amount of both sgag and collagen released from the explants after il - 1α / osm stimulation for 3 and 21 - 28 days , respectively , which is in agreement with previous reports ( 41 , 42 ). in the presence of il - 1α / osm approximately 50 % of the sgag content was released into the media over the 28 day period therefore it is slightly surprising that the amount of sgag in the tissue does not reflect this . we surmise that in the presence of the cytokines , the tissue is continually synthesising new sgag to replace that which is lost ( 43 ). detection of sgag and collagen in the media mainly represents degradation and release of ecm components from the tissue . interestingly , b . frereana was only able to rescue il - 1α / osm - mediated collagen degradation . over the 28 day period , b . frereana had no effect on the amount of sgag released into the media after cytokine stimulation ; this would suggest that a different mechanism of action must exist between the collagen and sgag to explain the differential inhibition observed . key mediators of collagen breakdown include mmps 9 and 13 ( 44 ). increased levels of active mmp 9 have been observed in pathological articular cartilage ( 1 , 3 - 6 ). to ascertain whether the observed increase in collagen release by il - 1α / osm and subsequent modulation by b . frereana , represented a catabolic phenotype , the expression and activation status of pro - mmp 9 was analysed . over the 28 days , both pro - mmp 9 synthesis and its activation increased substantially in cytokine - stimulated explants , which may have contributed to the significant release of collagen at days 21 - 28 , as has been previously reported ( 44 ). b . frereana inhibited il - 1α / osm - mediated synthesis and activation of pro - mmp 9 returning expression to basal levels . [ il - 1α / osm did not have a significant effect on pro - mmp 2 expression , although levels of active mmp 2 appeared to increase . after 28 days , b . frereana also inhibited activation of pro - mmp 2 ]. our data suggests that the reduction in il - 1α / osm - induced expression of pro - mmp 9 in explants treated with b . frereana may arise from the transcriptional inhibition of mmp 9 that we observed . mmp 9 synthesis is modulated by a variety of pro - inflammatory molecules including no and cox - 2 ( 45 ), and it is well established that both no and cox - 2 are involved in cartilage degradation ( 43 , 46 ). nitrite , the stable end product of no , was significantly elevated in cartilage explants stimulated with il - 1α / osm over the entire culture period , whilst in the presence of b . frereana , cytokine - induced no production was significantly inhibited . we hypothesise that the vast increase in pro - mmp 9 synthesis and activation can , in part , be attributed to no levels , and that the action of b . frereana in inhibiting no production prevented the downstream synthesis and / or activation of mmp 9 . joint inflammation in oa also increases circulating levels of cox - 2 — the rate - limiting enzyme in pge 2 synthesis , which causes an increased synthesis of pge 2 . a previous study indicated a link between no and cox - 2 expression in a canine model of experimental oa ( 45 ). the combination of il - 1α with osm significantly elevated pge 2 synthesis to approximately 80 - fold that observed in the untreated cartilage explants , consistent with previous studies ( 37 , 47 ). using the il - 1α / osm combination , b . frereana reduced pge 2 levels although this did not return to basal levels . to further understand the mechanism of b . frereana action in this in vitro inflammatory model of cartilage degradation , we quantified the amount of gene transcripts for inos , pge 2 synthase and cox - 2 using qpcr . all were observed to increase significantly in the explants treated with il - 1α / osm , and in the combined presence of b . frereana , levels of gene transcription were significantly reduced ; however , they did not return to the basal levels observed in untreated explants . our data would suggest that the inhibitory action of b . frereana on no and pge 2 synthesis is controlled at the transcriptional level . although several studies have been performed on b . serrata , and its pharmacologically active components have been identified as predominantly α - and β - boswellic acids ( 24 ), little is known about the bioactive ingredients of b . frereana excepting that it is reported to differ from the other species ( 48 ). using gas chromatography in conjunction with mass spectrometry , we have identified the primary constituents of b . frereana , of which epi - lupeol accounts for almost 60 % of the extract . although b . frereana has the geneology of the boswellia species , it is devoid of the active components such as boswellic acid , that are characteristic of the other family members , as has previously been alluded to ( 48 ). epi - lupeol is a pentacyclic triterpene ; it &# 39 ; s isomer lupeol is a naturally occurring triterpene found in various fruits and vegetables including olives , strawberries and fig plants ( 49 ). interestingly , and of potential importance in understanding the mechanisms of b . frereana action in our study , is the biochemical properties of lupeol . lupeol has been shown to have wide - ranging pharamacological properties including anti - inflammatory and anti - arthritic activity in vitro and in vivo ( 50 , 51 ). oral administration of lupeol to a rat model of antigen - induced arthritis led to a 39 % reduction in paw swelling , and a reduction in the amount of hydroxyproline and sgags in the urine indicating that lupeol could ameliorate the symptoms of inflammation ( 51 ). lupeol administered topically to a murine model of inflammation induced by 12 - o - tetradecanoyl - phorbol ester suppressed ear edema , due to a significant reduction in pge 2 and a weaker inhibition of nitrite release ( 50 ). our observations support this in vivo data although we saw greater efficacy against nitrite production with respect to pge 2 levels , however , this may reflect the fact that the active component of b . frereana is epi - lupeol and not lupeol . topical administration of lupeol to a mouse skin tumourigenesis model significantly inhibited skin edema and hyperplasia in conjunction with decreased expression of cox - 2 and no synthase ( 52 ), agreeing with the efficacy of epi - lupeol in our in vitro study . the reduction in cox - 2 and no synthase was attributed to an inhibition of nf - κb activation . the nuclear transcription factor nf - κb is a key player in the development and progression of chronic inflammatory diseases including rheumatoid arthritis ( 53 ). the anti - inflammatory properties of b . serrata involve the regulation of nf - κb activation , as demonstrated in a recent study using a mouse model of atherosclerosis ( 54 ). however , although b . serrata is known to inhibit 5 - lipoxygenase function ( 25 ), lupeol was shown to have no effect on lipoxygenase products ( 50 ), therefore lupeol is not likely to affect the 5 - lipoxygenase pathway . additionally extract of b . frereana was able to inhibit acetylcholinesterase activity and kill a well known model of cancer i . e . breast cancer cell line mcf - 7 . to conclude , this is the first report detailing the anti - inflammatory efficacy of b . frereana such as in articular cartilage . our novel data demonstrates that the treatment of il - 1α / osm stimulated cartilage explants with b . frereana confers some protection against degeneration of the tissue by inhibiting the breakdown of the collagenous matrix , through the inhibition of mmp 9 expression and activation , and significant reduction in the expression of inflammatory mediators including no , pge 2 and cox - 2 . it follows that b . frereana can therefore be exploited as a medicament to treat mmp 9 mediated disorders or conditions where there is a need for a significant reduction in the expression of inflammatory mediators including no , pge 2 and cox - 2 . b . frereana , which is non - toxic and particularly efficacious for pge 2 regulation may offer an additional perspective for the therapeutic action of this naturally occurring compound . moreover , b . frereana may confer some protection against neurological disorders characterised by increased acetylcholinesterase activity or where it is desirable to block this activity . further , b . frereana has application in the destruction of cancer cells . development of animal models of ibd has contributed to the understanding and discovery of therapies for ibd . we have previously established the dextran sulfate ( dss ) and the trinitrobenzene sulfonic acid ( tnbs ) colitis rodent models in our laboratory and in a collaborative effort have demonstrated that the severity of weight loss , colon histopathology and endoscopy scores corresponded to the degree of changes in proinflammatory cytokines and chemokines that preferentially attract infiltration of neutrophils and matrix metalloproteinases . the ibd rodent model has also been used to validate a computational approach to identify potential new drug therapies for ibd . the effect of boswellia frereana in the treatment of an animal model of ibd , specifically , dss induced colitis , was explored . sixty - five ( 65 ) male c57bl / 6 mice with average starting body weight (± sd ) of 23 . 25 ± 1 . 34 g were obtained from charles river laboratories ( wilmington , mass .). mice were acclimatized for a minimum of 3 days prior to study commencement . during this period , the animals were observed daily in order to reject animals that presented in poor condition . the study was performed in animal rooms provided with hepa filtered air at a temperature of 70 ± 5 ° f . and 50 %± 20 % relative humidity . animal rooms were set to maintain a minimum of 12 to 15 air changes per hour . the room was on an automatic timer for a light / dark cycle of 12 hours on and 12 hours off with no twilight . sterile bed - o - cobs ® or equivalent bedding was used . bedding was changed a minimum of once per week . cages , tops , and water bottles were washed with a commercial detergent and allowed to air dry . a commercial disinfectant was used to disinfect surfaces and materials introduced into the hood . floors were swept daily and mopped a minimum of twice weekly with a commercial detergent . walls and cage racks were sponged a minimum of once per month with a dilute bleach solution . a cage card or label with the appropriate information necessary to identify the study , dose , animal number , and treatment group was used to mark all cages . the temperature and relative humidity was recorded during the study , and the records retained . animals were fed with a sterile purina labdiet ® 5053 rodent diet and sterilized water was provided ad libitum . mice were randomized into five ( 5 ) groups of ten ( 10 ) animals and one ( 1 ) group of fifteen ( 15 ) animals prior to the start of the study . each animal was identified by an ear punch corresponding to an individual number . a cage card was used to identify each cage and was marked with the study number ( inh - 01 ), treatment group number , and animal numbers . colitis was induced by administration of 3 % w / v dss ( mp biomedicals ; cat # 10156 ) in the drinking water on days 0 to 5 . dss solution was replaced with a freshly prepared solution on day 3 and any of the remaining original dss solution was discarded . boswellia extract ( lot # r14 - 038 batch2 4 / 15 / 14 ) in the specified concentrations was formulated in corn oil fresh daily , protected from light , and stored at room temperature . briefly , boswellia extract was weighed and placed in a small eppendorf tube . corn oil was added to make the highest concentration of extract ( 200 mg / kg ). after homogenizing the mixture mechanically , serial dilutions were performed to make the remaining concentrations of boswellia extract . it was delivered via oral biomodels study inh - 01 biomodels , llc / confidential gavage ( p . o .) at a dosing volume of 0 . 1 ml / 20 g body weight ( 5 ml / kg ). disposition of unused dosing mixture was performed per biomodels sop . statistical differences between a test group and the vehicle control were determined using one - way anova followed by post - hoc analysis using the holm - sidak &# 39 ; s multiple comparison test ( graphpad prism 6 . 01 , graphpad software , la jolla , calif .). in this study , colitis was induced in 55 mice by exposure to 3 % dss - treated drinking water from day 0 to day 5 . animals were dosed via oral gavage ( p . o .) with test article or corn oil vehicle once a day ( q . d .) from day − 2 to 12 , as indicated in table 8 . all animals were weighed daily and assessed visually for the presence of diarrhoea and / or bloody stool at the time of dosing . video endoscopy was performed on days 7 , 10 and 12 . at these time points , colitis severity was assessed in all animals using video endoscopy , where images were taken and colitis severity was scored by an observer blind to treatment group designation . additionally , an image was captured from each animal at the most severe region of disease identified during endoscopy . following endoscopy on day 12 , all remaining animals from each treatment group were sacrificed . upon sacrifice , the colon was excised , the contents removed , and its length and weight measured . the colon was then trimmed to a length of 5 cm and divided into three pieces . the distal 2 cm and proximal 2 cm portion were placed in formalin , for subsequent histological evaluation , while the middle 1 cm portion was weighed and then snap frozen for subsequent biomarker evaluation . blood was collected and plasma samples were prepared . the details of the study design and group assignment are shown in table 8 . study endpoints were endoscopy colitis score , body weight change , survival , blood for plasma preparation , colon length , colon weight , and colon histology . the presence of diarrhoea and / or the presence of blood in the stool were assessed via visual assessment at the time of dosing . animal deaths were evaluated during the course of the study . in this colitis model , animal deaths are commonly attributable to severe weight loss due to severe colitis , toxicity of the experimental compound , or perforation of the colon during endoscopy . since weight change is a secondary method to examine potential toxicities of experimental treatments , animals were weighed daily throughout the study . endoscopy was performed in a blinded fashion using a small animal endoscope ( karl storz endoskope , germany ). to evaluate colitis severity , animals were anesthetized with isoflurane and subjected to video endoscopy of the lower colon . colitis was scored visually on a 5 point scale that ranges from 0 for normal , to 4 for severe ulceration . in descriptive terms , this scale is defined as depicted in table 9 . each mouse was assigned a single score that corresponded to the most severe damage observed throughout the entire length of the colon . upon sacrifice with co2 inhalation , the colon was excised , the contents removed and collected , and its length and weight measured . the colon was then trimmed to a length of 5 cm and divided into three pieces . the distal 2 cm and proximal 2 cm portion were placed in formalin , for subsequent histological evaluation , while the middle 1 cm portion was weighed and snap frozen for subsequent biomarker evaluation . blood was collected and plasma samples prepared . a board certified veterinary pathologist with particular expertise in gi pathology evaluated h & amp ; e stained colon sections in a blinded fashion . each section was assessed for morphological changes / injury to the epithelium , connective tissue , and submucosa using a 5 point scale , in which 0 = normal colon ; score of 1 = minimal inflammation , edema , or necrosis ; score of 2 = mild inflammation , edema , or necrosis ; score of 3 = moderate inflammation , edema , or necrosis ; and score of 4 = marked inflammation , edema , or necrosis . photomicrographs were taken to document findings . elisas were performed for the biomarkers listed below by using commercially available kits and following the manufacturer instructions / protocols : il - 1β ( r & amp ; d systems , # mlb00c ); tnf - α ( r & amp ; d systems , # mta00b ); cox - 2 ( r & amp ; d systems , # dyc4198 - 2 ); mmp - 9 ( r & amp ; d systems , # mmpt90 ); nitric oxide ( abcam , # ab5328 ); ifn - γ ( r & amp ; d systems , # mif00 ); and il - 2 ( r & amp ; d systems , # d2050 ). there were three ( 3 ) unanticipated animal deaths during this study . one animal in group 5 was found dead on day 9 . in group 6 , one animal was sacrificed on day 7 due to perforation of the colon during endoscopy and one animal was sacrificed on day 11 due to moribund state and excessive weight loss . the mean daily percent weight change for all treatment groups is shown in fig1 . animals started losing weight on day 1 . animals in groups 2 - 6 exhibited peak mean weight loss of − 19 . 66 ± 1 . 38 %, − 10 . 66 ± 1 . 26 %, − 13 . 28 ± 1 . 88 %, − 19 . 06 ± 2 . 14 %, and − 15 . 60 ± 2 . 05 %, respectively , on day 9 . compared to the untreated control group without dss , all of the groups treated with dss exhibited significant weight loss ( p & lt ; 0 . 0001 ). in comparison to the vehicle control group ( group 2 ), animals treated with 25 mg / kg ( group 3 ), 50 mg / kg ( group 4 ), and 200 mg / kg boswellia extract ( group 6 ) had significantly less weight loss ( p & lt ; 0 . 01 for groups 3 and 6 , p & lt ; 0 . 05 for group 4 ) as determined by evaluating the area - under - the - curve ( auc ) for body weight change and utilizing one - way anova with holm - sidak &# 39 ; s multiple comparisons post - hoc test ( fig1 ). on the last day of the study ( day 12 ), the average body weight of animals ( in grams ± sem ) in groups 1 - 6 was as follows : 25 . 20 ± 0 . 67 ( group 1 ), 19 . 41 ± 0 . 61 ( group 2 ), 22 . 47 ± 0 . 42 ( group 3 ), 20 . 95 ± 0 . 37 ( group 4 ), 20 . 03 ± 0 . 75 ( group 5 ), and 21 . 29 ± 0 . 55 ( group 6 ). evaluation using unpaired student &# 39 ; s t - test revealed that , in comparison to the untreated control group ( group 1 ), animals in all other groups had significantly less weight ( p & lt ; 0 . 01 - p & lt ; 0 . 0001 ). in comparison to the vehicle control group ( group 2 ), only animals in group 3 ( p & lt ; 0 . 01 ) had significantly more weight . no other groups had statistically significant differences in weight on day 12 in comparison to group 2 . all animals underwent video endoscopy on days 7 , 10 , and 12 to assess the severity of colitis in each treatment group . the mean colitis scores for all treatment groups are shown in fig1 ( day 7 ), fig1 ( day 10 ), and fig1 ( day 12 ). treatment with dss on days 0 to 5 successfully induced colitis as determined by video endoscopy on days 7 , 10 , and 12 in all the dss - treated groups in comparison to the untreated control group ( group 1 ). there were no statistically significant differences in mean endoscopy colitis scores between the boswellia extract treatment groups and the vehicle control group on days 7 and 10 . on day 12 , animals treated with 25 mg / kg boswellia extract ( group 3 ) had a statistically significant ( p & lt ; 0 . 01 ) reduction in mean endoscopy colitis scores in comparison to the vehicle control group ( group 2 ). representative endoscopic images of the treatment groups on days 7 , 10 , and 12 are shown in fig1 - 23 . animals were sacrificed on day 12 and their colons were removed and weighed . the mean colon weights for all treatment groups are shown in fig2 . there were no significant differences in mean colon weight among any of the groups in comparison to the vehicle control group ( group 2 ). animals were sacrificed on day 12 and their colons were removed and their lengths measured . the mean colon length for all treatment groups are shown in fig2 . in comparison to the vehicle control group , animals in the naïve control group had statistically significant longer colons ( p & lt ; 0 . 0001 ). furthermore , animals treated with 25 mg / kg and 50 mg / kg ( group 3 and group 4 , respectively ) also had significantly longer colon lengths than the vehicle control group ( p & lt ; 0 . 05 for both ). diarrhoea was first observed on day 6 from animals in the vehicle control group and from animals treated with 100 mg / kg boswellia extract . on day 7 , diarrhoea was observed in at least one animal in each dss - treated group . diarrhoea peaked between days 8 - 10 for most dss - treated groups . generally , the incidence of diarrhoea was lower in animals treated with boswellia extract in comparison to animals treated with vehicle ( table 10 ). the incidence of bloody stool was less common than the incidence of diarrhoea ( table 11 ). elisas were performed by using commercially available kits and following the manufacturer instructions / protocols for the following markers : tnfα , il - 1β , mmp9 , nitric oxide , il - 2 , and ifn - γ . the results are illustrated within fig2 . briefly , induction of colitis via dss exposure increased tnfα , il - 1b and mmp9 levels and decreased nitric oxide , il - 2 and ifn - gamma levels . treatment with boswellia extract at the 25 mg / kg concentration was most effective at moderating levels for tnf - α , il - 1b , and mmp9 and a higher concentration was most effective at moderating the levels of il - 2 . boswellia extract was less effective at moderating the levels of nitric oxide , and ifn - gamma . 1 . there were three ( 3 ) unanticipated animal deaths during this study . one animal in group 5 was found dead on day 9 . in group 6 , one animal was sacrificed on day 7 due to perforation of the colon during endoscopy and one animal was sacrificed on day 11 due to moribund state and excessive weight loss . 2 . animals started losing weight on day 1 . animals in groups 2 - 6 exhibited peak mean weight loss of − 19 . 66 ± 1 . 38 %, − 10 . 66 ± 1 . 26 %, − 13 . 28 ± 1 . 88 %, − 19 . 06 ± 2 . 14 %, and − 15 . 60 ± 2 . 05 %, respectively , on day 9 . compared to the untreated control group without dss , all of the groups treated with dss exhibited significant weight loss ( p & lt ; 0 . 0001 ). in comparison to the vehicle control group ( group 2 ), animals treated with 25 mg / kg ( group 3 ), 50 mg / kg ( group 4 ), and 200 mg / kg boswellia extract ( group 6 ) had significantly less weight loss ( p & lt ; 0 . 01 for groups 3 and 6 , p & lt ; 0 . 05 for group 4 ). on the last day of the study ( day 12 ), the average body weight of animals ( in grams ± sem ) in groups 1 - 6 was as follows : 25 . 20 ± 0 . 67 ( group 1 ), 19 . 41 ± 0 . 61 ( group 2 ), 22 . 47 ± 0 . 42 ( group 3 ), 20 . 95 ± 0 . 37 ( group 4 ), 20 . 03 ± 0 . 75 ( group 5 ), and 21 . 29 ± 0 . 55 ( group 6 ). evaluation using unpaired student &# 39 ; s t - test revealed that , in comparison to the untreated control group ( group 1 ), animals in all other groups had significantly less weight ( p & lt ; 0 . 01 - p & lt ; 0 . 0001 ). in comparison to the vehicle control group ( group 2 ), only animals in group 3 ( p & lt ; 0 . 01 ) had significantly more weight . no other groups had statistically significant differences in weight on day 12 in comparison to group 2 . 3 . treatment with dss on days 0 to 5 successfully induced colitis as determined by video endoscopy on days 7 , 10 , and 12 in all the dss - treated groups in comparison to the untreated control group ( group 1 ). there were no statistically significant differences in mean endoscopy colitis scores between the boswellia extract treatment groups and the vehicle control group on days 7 and 10 . on day 12 , animals treated with 25 mg / kg boswellia extract ( group 3 ) had a statistically significant reduction in mean endoscopy colitis scores in comparison to the vehicle control group ( group 2 ). 4 . there were no significant differences in mean colon weight among any of the groups in comparison to the vehicle control group ( group 2 ) 5 . in comparison to the vehicle control group , animals in the naïve control group had statistically significant longer colons ( p & lt ; 0 . 0001 ). furthermore , animals treated with 25 mg / kg and 50 mg / kg ( group 3 and group 4 , respectively ) also had significantly longer colon lengths than the vehicle control group ( p & lt ; 0 . 05 for both ). 6 . diarrhoea was first observed on day 6 from animals in the vehicle control group and from animals treated with 100 mg / kg boswellia extract . on day 7 , diarrhoea was observed in at least one animal in each dss - treated group . diarrhoea peaked between days 8 - 10 for most dss - treated groups . generally , the incidence of diarrhoea was lower in animals treated with boswellia extract in comparison to animals treated with vehicle . the incidence of bloody stool was less common than the incidence of diarrhoea ( table 11 ). 7 . treatment with boswellia extract at doses ranging from 25 mg / kg to 200 mg / kg reduced inflammation scores , edema scores , necrosis scores and sum scores compared to the vehicle control group , but the treatment differences were not significant for any parameter . 8 . induction of colitis via dss exposure increased tnfα , il - 1b and mmp9 levels and decreased nitric oxide , il - 2 and ifn - gamma levels . treatment with boswellia extract at the 25 mg / kg concentration was most effective at moderating levels for tnf - α , il - 1b , and mmp9 and a higher concentration was most effective at moderating the levels of il - 2 . boswellia extract was less effective at moderating the levels of nitric oxide , and ifn - 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( 1994 ). minitab handbook ( third edition ). duxbury press . table 6 chemical components identified in various extracts of b . frereana oleoresin ( essential oil , hexane and ethanol ) fraction isolated ( extraction method ) essential oil ( steam resin resin distillation ) ( hexane ) ( ethanol ) % peak % peak % peak chemical components area area area α - thujene 0 . 76 0 . 34 { close oversize brace } 9 . 85 α - pinene 0 . 011 n . d sabinene n . d n . d { close oversize brace } 2 . 62 β - pinene n . d n . d α - phellandrene trace 0 . 118 0 . 074 m - cymene 1 . 62 n . d trace p - cymene 5 . 49 0 . 21 0 . 136 thujol 5 . 22 0 . 18 0 . 135 eucalyptol 0 . 91 0 . 065 0 . 058 thujol 2 . 87 0 . 047 0 . 042 trans - 2 - caren - 4 - ol 1 . 92 n . d n . d unknown 3 . 89 n . d n . d trans - pinocarveol 2 . 51 n . d n . d ( s )- cis - verbenol 0 . 62 n . d n . d thujen - 2 - ene / thujone 3 . 19 0 . 056 0 . 050 sabinol 3 . 62 0 . 047 trace terpinen - 4 - ol 6 . 59 n . d n . d p - cymen - 8 - ol 2 . 67 n . d n . d α - terpineol 1 . 55 n . d n . d verbenone 0 . 94 n . d n . d cuminaldehyde 0 . 87 n . d n . d unknown 3 . 07 n . d n . d bornyl acetate 0 . 54 n . d n . d cuminol 1 . 52 n . d n . d carvacrol 1 . 53 n . d n . d β - bourbonene 2 . 89 0 . 100 0 . 095 t - cadinol 0 . 37 n . d trace α - phellandrene dimer 1 0 . 14 n . d trace α - phellandrene dimer 2 0 . 56 0 . 044 trace α - phellandrene dimer 3 11 . 45 1 . 34 1 . 103 α - phellandrene dimer 4 0 . 42 0 . 057 0 . 042 α - phellandrene dimer 5 2 . 35 0 . 299 0 . 243 lupeol n . d 0 . 094 0 . 087 β - amyrin n . d 6 . 502 6 . 357 α - amyrin n . d 2 . 39 2 . 384 epi - lupeol n . d 60 . 32 59 . 32 unknown n . d 7 . 28 7 . 266 lupeol acetate n . d 2 . 96 3 . 105 % compounds 81 . 79 82 . 88 80 . 85 identified comparison of the gc - ms chromatographic profile of the essential oil and hexane extract of b . frereana