Abstract
An improved extraction procedure and a new RP-HPLC method were developed for selective and rapid analysis of caffeine and 14 of its metabolites in urine. Analytes were isolated by solid-phase extraction and separated on an Eclipse XDB-C18 column. Recoveries ranged between 83 and 99%. Precision, linearity and accuracy of the chromatographic method were found to be within required limits. Using this procedure, caffeine metabolic ratios were determined in 20 subjects with characteristic CYP1A2 activities, relatively to smoking habit and contraceptives intake. The method might be useful to point out induction and inhibition of CYP1A2 activity.
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