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During investigations on the N-oxygenation of adenine (1) the enzymatic formation of adenine 1-N-oxide 3 was demonstrated for the first time. The identity of this metabolite was confirmed by its chromatographic behaviour and UV-spectrum recorded after HPLC separation. Adenine 1-N-oxide (3) and similar oxygenated derivatives of adenine were synthesized as reference substances. The enzymatic formation of 3 exhibits the typical characteristics of a reaction catalysed by microsomal mono-oxygenases. In induction experiments, an increase in the rate of formation of 3 after pretreatment with phenobarbital was observed. A participation of those isoenzymes of the cytochrome P-450 enzyme system which can be induced by phenobarbital is assumed.
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Clement et al. (1993) studied this question.
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