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Analytical challenges in the confirmative identification of dipyrone as an adulterant in illicit drug samples.
Forensic Science International 2017 January
Dipyrone is an analgesic and antipyretic drug that is sometimes encountered as an adulterant in illicit drug samples, particularly illicit fentanyl containing samples. It undergoes thermal decomposition to aminopyrine and 4-methylaminoantipyrine during analysis via gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS). During analysis via high pressure liquid chromatography (HPLC) and high pressure liquid chromatography-mass spectrometry (HPLC-MS), it undergoes hydrolytic decomposition solely to 4-methylaminoantipyrine. Given that mass spectrometry is a widely used confirmatory analytical technique, these instabilities present challenges for the forensic chemist seeking to confirm the presence of dipyrone. Studies were conducted to determine rigorous confirmative protocols for the identification of dipyrone in multicomponent illicit drug samples.
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