title: Species differences in the metabolic C- and N-oxidation , and N-methylation of [14C]pyridine in vivo.
abstract: 1. The metabolism of [2,6-14C]pyridine in vivo has been investigated in the rat, hamster, mouse, gerbil, rabbit, guinea-pig, cat and man, and the quantitative determination of the various urinary metabolites carried out by radiochromatographic analysis. 2. Unchanged pyridine and its N-methylated metabolite, N-methylpyridinium ion, were determined using a Partisil-10 SCX cation-exchange h.p.l.c. column, whereas the C- and N-oxidation products were assayed by reverse-phase chromatography, using a Partisil-10 ODS column. 3. Most of the species studied produce pyridine N-oxide, N-methylpyridinium ion, 2-pyridone, 3-hydroxypyridine and 4-pyridone as metabolites, but the proportion of the dose excreted as each of these metabolites is species-dependent.
mesh_terms: D000818:Animals; D002415:Cats; D002849:Chromatography, Gas / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002855:Chromatography, Thin Layer / Q000379:methods; D006224:Cricetinae; D005260:Female; D005849:Gerbillinae; D006168:Guinea Pigs; D006801:Humans; D008297:Male; D008647:Mesocricetus; D008745:Methylation; D051379:Mice; D010084:Oxidation-Reduction; D011725:Pyridines / Q000378:metabolism*; D011817:Rabbits; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity
chemical_list: D011725:Pyridines; C023666:pyridine