Abstract

AbstractHPLC and mass spectrometry can be used to isolate and identify all metabolites of caffeine in plasma of patients. The synthesis of [1,3‐15N2] xanthine and [1,3‐ 15N2] caffeine are of interest in the elucidation of mass spectrometry fragmentation pathways and the unambiguous determination of metabolites, especially uric acid which exists as a natural constituent of human plasma.

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