Abstract
A gas chromatograph/Fourier transform-infrared (GC/FTIR) spectrometric analysis of five monomethylated fentanyl related compounds, widely abused designer drugs, was evaluated, and spectra obtained were compared with those measured in condensed phase. Infrared spectra obtained in vapor phase showed much difference compared to those of condensed phase, especially in the fingerprint region. However, the discrimination of these five isomers by infrared spectra alone in vapor phase or condensed phase was considered to be difficult. In order to perform the accurate discrimination of these kinds of drugs, which possess high boiling points and very closely related structures, the combination of different analytical techniques must be used such as FTIF, GC/FTIR, and retention times.
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