Profiling of illicit fentanyl using UHPLC-MS/MS.

Area of Science:

• Forensic Chemistry
• Analytical Chemistry
• Mass Spectrometry

Background:

• Fentanyl and its analogues are potent synthetic opioids posing significant public health risks.
• Characterizing fentanyl in seized drug samples is crucial for forensic investigations and intelligence gathering.
• Identifying the synthetic route of fentanyl can help trace illicit drug supply chains.

Purpose of the Study:

• To develop and validate a methodology for the comprehensive profiling of fentanyl in seized drug materials.
• To identify specific fentanyl processing impurities indicative of distinct synthetic pathways (e.g., Siegfried, Janssen).
• To enable the linking of drug seizures through the analysis of chemical signatures.

Main Methods:

• Ultra high performance liquid chromatography (UHPLC) coupled with tandem mass spectrometry (MS/MS) was employed.
• A targeted analysis of 40 fentanyl processing impurities was performed.
• Separation was achieved using an Acquity BEH C18 column with a formic acid/acetonitrile gradient, and detection utilized an electrospray ionization source in selected reaction monitoring (SRM) mode.

Main Results:

• The UHPLC-MS/MS method successfully separated and detected 40 fentanyl processing impurities.
• Specific impurities were identified as markers for the Siegfried and Janssen synthetic routes.
• The method demonstrated high sensitivity and selectivity, capable of detecting trace fentanyl levels in complex matrices.

Conclusions:

• The developed UHPLC-MS/MS methodology provides a powerful tool for fentanyl profiling in forensic samples.
• Analysis of impurities allows for the determination of fentanyl's synthetic origin, aiding in drug trafficking investigations.
• This technique is applicable for linking drug seizures and analyzing samples containing fentanyl alongside heroin or adulterants.