A sensitive and accurate reversed phase liquid chromatographic assay was developed for the determination of 6-mercaptopurine (6MP) (the active metabolite of azathioprine) in human plasma. The assay involved extraction into acetonitrile and dichloromethane from plasma pretreated with 0.038 M of dithiothreitol solution. The residue was analyzed by isocratic chromatography on a C18 analytical column with UV detection at 326 nm. The average extraction recovery of 6MP was 85%. The method has been applied successfully to the determination of 6MP and its metabolites in pharmacokinetic studies.
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