Abstract
1. The metabolism of several alkyl- and alkoxy-substituted pyrazines in the rat has been investigated. 2. Alkyl substituted compounds were oxidized to the corresponding acids which were excreted in the urine as such or as their glycine cojugates. The extent of oxidation was reduced when two adjacent alkyl groups were present. In the latter case ring hydroxylation also occurred. Methoxy-substituted pyrazines underwent O-demethylation and ring hydroxylation. 3. Little or no biliary excretion of the pyrazines or their metabolites occurred. 4. Some preliminary results on the metabolism of 2-isobutyl-3-methoxy-pyrazine (the major characteristic flavour component of bell pepper) have been obtained. 5. For comparative purposes the metabolism of some similarly substituted pyridines was investigated.
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