Abstract
An analytical procedure for the simultaneous determination in human serum of 43 common drugs of abuse and their metabolites belonging to the different chemical and toxicological classes of amphetamines, benzodiazepines, dibenzazepines, cocaine, lysergic acid diethylamide, opioids, phencyclidine, tricyclic antidepressants, and zolpidem, using 33 deuterated standards, is presented. The sample treatment was developed to be a very simple protein precipitation and filtration. All analyses were performed with a high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry in positive ionization mode. All analytes were calibrated up to 550 μg/L. The limit of detection ranged from 0.6 ng/mL (EDDP) to 13.7 ng/mL (flunitrazepam). The method has been validated according to the guidelines of the Gesellschaft für Toxikologische und Forensische Chemie, using three multiple reaction mode (MRM) transitions and retention time for positive compound identification, instead of two MRMs, in anticipation of the new guidelines for January 2011.
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