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Updated: Aug 12, 2026

Large Scale Non-targeted Metabolomic Profiling of Serum by Ultra Performance Liquid Chromatography-Mass Spectrometry (UPLC-MS)
Published on: March 14, 2013
Determination of esterase-catalyzed cocaine metabolite formation by high-performance liquid chromatography with
1Department of Cellular and Molecular Pharmacology, University of California, San Francisco 94143-0450, USA.
Abstract:
A reversed-phase high-performance liquid chromatographic (HPLC) method for the determination of cocaine metabolites produced in vitro by serum and liver esterases is described. Hydrolysis of cocaine at the methyl ester bond produces benzoylecgonine and methanol, whereas hydrolysis at the benzoyl ester bond produces ecgonine methyl ester and benzoic acid. This method quantitates benzoic acid (as a measure of ecgonine methyl ester formation) and benzoylecgonine, which can be determined simultaneously and with great sensitivity by HPLC and ultraviolet detection. Cocaine is found to be hydrolyzed to both ecgonine methyl ester and benzoylecgonine; hepatic microsomes exhibit the highest specific activity.
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