Abstract
A highly sensitive and rapid assay for the detection of 6-mercaptopurine metabolites in the red blood cells of leukemic patients receiving the drug has been developed. The method employs a batch-chromatographic procedure using a mercurial cellulose resin to selectively absorb thiol compounds combined with separation by high-performance liquid chromatography using a Partisil-SAX column and uv detection. This method permits detection of 6-thioinosine monophosphate, 6-thiouric acid, and 6-thioguanosine mono-, di-, and triphosphates in patient samples with a sensitivity of 5–10 pmol. No 6-thioinosine di- or triphosphates were detected in patient samples. The results of our study indicate that 6-thioguanosine triphosphate is the major metabolite of 6-mercaptopurine retained by red blood cells after oral or iv administration of the drug.
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