Development of a stand-alone affinity clean-up for lysergic acid diethylamide in urine

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Abstract
A total analysis scheme for lysergic acid diethylamide (LSD) from human urine is described. A simple ELISA technique led to the development and optimization of an affinity clean-up cartridge, resulting in high purification factors with a single combined extraction/clean-up step. LSD can be measured with a straightforward HPLC–fluorescence technique, which minimizes operating complexity and process implementation time. The method has been applied to urine containing 0.5 ng ml–1 LSD, and the ability of high-affinity materials to preconcentrate a sample into a small volume should allow the working range of the procedure to be adjusted as required.

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