Analysis of Fentanyl and Fentanyl Analogs Using Atmospheric Pressure Chemical Ionization Gas Chromatography-Mass Spectrometry (APCI-GC-MS).

As seen in Figures S4 and S5 (in the Supporting Information section) , a notable trend among these analogs with the exception of 2′,4′-dimethoxy fentanyl that exclusively produce ion B is the presence of three functional groups at the phenyl terminus, two of which are methoxy groups.

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Furthermore, when comparing the relative intensities of structure A at 20 V for fentanyl analogs featuring a halogen at the para position of the phenyl ring, a clear trend emerges relating the electronegativity of the halogens to the intensity of the produced ion A.

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