volume 52, issue 3, P274-276 1992
DOI: 10.1038/clpt.1992.141
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Abstract: The frequency distribution of N-acetylation of caffeine was determined in 140 unrelated healthy Japanese subjects by measuring the amount of two main metabolites of caffeine, 5-acetylamino-6-formyl-amino-3-methyluracil (AFMU) and 1-methylxanthine (1X), in urine after an oral dose of caffeine. N-Acetylation capacity for caffeine appeared to be polymorphic: 15 subjects (10.7%) were phenotyped as slow acetylators, whereas 125 subjects (89.3%) were phenotyped as rapid ones. The urinary molar excretion ratio of AFM…

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