Abstract
1. 1. The oxidation by mammalian xanthine oxidase of pteridine, its monohydroxy derivatives and of 2,4-dihydroxypteridine has been investigated. All these compounds, with the exception of 6-hydroxypteridine, are attacked by the enzyme. 2. 2. In all cases the same end-product is obtained, which has been identified as 2,4,7-trihydroxypteridine. 3. 3. These observations indicate that the 6-hydroxyl group in xanthopterin can not originate through interaction of its precursor with xanthine oxidase.
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