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                            Library & Multimedia
 Utility of gas chromatography infrared spectroscopy (GC-IR) for the differentiation of isomers of related substances
NCJ Number
              305514
Journal

*Forensic Chemistry* Volume: 29 Dated: July 2022
Author(s)
          Kimiko Ferguson;
                        Sherri L. Tupik;
                        Hunter Haddad;
                        Jeannette Perr;
                        Michael Gilbert;
                        Reta Newman;
                        José Almirall
Date Published

July 2022
Annotation
              For this study, the analysis by GC coupled to a vapor-phase infrared spectroscopy detector (GC-IR) was used as a complementary technique to GC–MS for the identification of positional isomers of FRS. The result is a novel fentanyl library consisting of 212 different FRS reference compounds.
Abstract
              Forensic laboratories routinely use gas chromatography mass spectrometry (GC–MS) in the identification of controlled substances using both retention time and electron impact ionization (EI) mass spectra. Certain drugs such as positional isomers of some fentanyl related substances (FRS) can produce indistinguishable EI mass spectra but may be differentiated using retention time. The core structure of fentanyl consists of an amide group, a piperidine ring, an aniline ring, and an N-alkyl chain, each providing opportunities for points of substitution that create FRS and corresponding positional isomers. In the current project, a collaboration among three different laboratories yielded correct identifications of twenty blind samples when searched against the GC-IR FRS library created at Florida International University (FIU). The expected limits of detection for fentanyl using GC-IR range between 0.10 and 0.19 mg/mL, depending on the sample introduction (injector) method and other instrumental parameters. The newly created GC-IR library and its GC–MS counterpart of 212 FRS are shared in the supplementary materials for future use by researchers and practitioners. (Publisher abstract provided)
      
  
          Additional Details
Grant Number(s)
        2014-DNR-4918
                                DJO-NIJ-21-RO-0002


  
  
        
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        NIJ-Sponsored


  
  
        
  Publication Type
        Research (Applied/Empirical)


  
  
        
  Award
        Interagency Collaboration to Support Forensic Science Research
                                NIJ Co-funding for the NSF Center for Advanced Research in Forensic Science (CARFS)
    
  
  
Date Published: July 1, 2022
    
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