Determination of lysergide (LSD) and phencyclidine in biosamples.

Lysergic acid diethylamide (LSD) is difficult to detect and to quantify in biosamples because of its very low active dose. Although there are a number of tests available, routine analysis of LSD is rarely performed. Immunoassays largely vary in their specificity and cross-reactivities with other molecules often make these tests unreliable. Because of its low concentration and the instability of the derivatives (e.g. trimethylsilyl-LSD), routine gas chromatography-mass spectrometry (GC-MS) detection and quantitation of LSD remains a difficult task. The most promising procedures for LSD determination seems to be liquid chromatography-MS analysis using electrospray ionisation and selected ion monitoring (SIM). Extraction, derivatization, GC or high-performance liquid chromatography conditions and the different detection modes will be summarised. Phencyclidine (PCP) is an abused drug seldom found outside the United States. Well established detection and quantitation procedures include radioisotopic and nonradioisotopic immunoassays and GC-MS analysis using SIM mode with deuterated PCP as internal standard. Alternatively, GC with nitrogen-phosphorus detection or capillary electrophoresis has been used. Recent progress in PCP analysis will be summarised.