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14Effect of purines on the oxidation of ascorbic acid induced by copper, Biology of Metals Quantitative structure?retention relationships of xanthines in RP HPLC systems with the new Chromolith RP-18e stationary phases, Analytical and Bioanalytical Chemistry Theophylline and caffeine metabolism in man, Theophylline and other Methylxanthines / Theophyllin und andere Methylxanthine Determination of urine caffeine and its metabolites by use of high-performance liquid chromatography-tandem mass spectrometry: estimating dietary caffeine exposure and metabolic phenotyping in population studies, Analytical and Bioanalytical Chemistry Phenotype-genotype analysis of CYP1A2 in Japanese patients receiving oral theophylline therapy, European Journal of Clinical Pharmacology The effect of Shoseiryuto, a traditional Japanese medicine, on cytochrome P450s, N-acetyltransferase 2 and xanthine oxidase, in extensive or intermediate metabolizers of CYP2D6, European Journal of Clinical Pharmacology In vivo evaluation of CYP2A6 and xanthine oxidase enzyme activities in the Serbian population, European Journal of Clinical Pharmacology Xanthine oxidase inhibition by allopurinol affects the reliability of urinary caffeine metabolic ratios as markers for N-acetyltransferase 2 and CYP1A2 activities, European Journal of Clinical Pharmacology