Confirmation of amphetamine, methamphetamine, MDA and MDMA in urine samples using disk solid-phase extraction and gas chromatography-mass spectrometry after immunoassay screening.

A method using mixed phase disk solid-phase extraction (SPE) and gas chromatography-mass spectrometry (GC-MS) was developed for confirmation of amphetamine (AMP), methamphetamine (MET), 3,4-methylenedioxyamphetamine (MDA) and 3,4-methylenedioxymethamphetamine (MDMA) in urine samples after immunoassay screening. Disk SPE provided hydrophobic (C(18)) and… CONTINUE READING