Separating the wheat from the chaff: Observations on the analysis of lysergamides LSD, MIPLA, and LAMPA
Drug Testing and Analysis May 22, 2021 Simon D. Brandt, Pierce V. Kavanagh, Folker Westphal et al. 12 citations
Lysergic acid diethylamide (LSD) is a potent psychoactive substance of clinical interest, and its analogs, including N-methyl-N-isopropyl isomer (MIPLA), have appeared on the street market. This report describes analytical methods to differentiate MIPLA from LSD and the N-methyl-N-propyl isomer (LAMPA) under routine conditions. Gas chromatography-solid phase infrared spectroscopy was particularly helpful. GC-electron ionization-tandem mass spectrometry of the m/z 72 iminium ion distinguished the three isomers on mass spectral grounds alone. Derivatization with BSTFA improved GC separation. LC-Q-MS and in-source collision-induced dissociation differentiated MIPLA and LAMPA based on distinct m/z 239 ion ratios. An alternative LC-MS/MS method improved separation but LSD co-eluted with iso-LSD; comparing ion ratios at m/z 324.2 > 223.2 and 324.2 > 208.2 facilitated differentiation. Two blotters contained 180 and 186 μg MIPLA per blotter.