LC-MS analysis of 2-oxo-3-hydroxy LSD from urine using a Speedisk® positive-pressure processor with Cerex® Polychrom™ CLIN II columns

Abstract

A rapid and sensitive solid-phase extraction method for the lysergic acid diethylamide (LSD) metabolite 2-oxo-3-hydroxy-LSD (O-H-LSD) was developed for use in a forensic laboratory. The method uses a positive-pressure manifold anion-exchange polymer-based solid-phase extraction with subsequent analysis by liquid chromatography-mass spectrometry (LC-MS). The average extraction efficiency was 92%. The limits of detection (LOD) and quantitation (LOQ) were calculated at 250 pg/mL. The assay was linear, precise, and accurate from 250 to 30,000 pg/mL with an r2 of 0.999. Samples including 93 compounds with properties similar to O-H-LSD, common over-the-counter products, prescription drugs and some of their metabolites, and other drugs of abuse were analyzed and produced no significant interference. This method has increased our efficiency in analyzing O-H-LSD by reducing the overall extraction and analysis time. The increase in extraction efficiency enabled decreased assay LOD and LOQ values while lowering the volume required for injection.