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It is known that substituted 1,2,4-triazole-3-thione derivatives have several biological activities, such as antimicrobial, diuretic and antidepressant activities. In our previous studies, the antifungal activity of 5-(4-aminophenyl)-4-phenyl-2,4-dihydro-3H-1,2,4-triazole-3-thione was found to be active against Candida tropicalis K1022. The aim of this study was to investigate the in vivo metabolic pathway of 5-(4-nitrophenyl)-4-phenyl-2,4-dihydro-3H-1,2,4-triazole-3-thione which was selected as a model compound for this study. The substrate and its potential metabolites, i.e. the acetylation and nitro reductive products, were synthesized and then separated using HPLC on a reverse phase system. In the in vivo metabolism study, a 4 mg dose was administered i.p. to male Wistar rats. Blood samples were collected at 0, 2, 4, 8, 12, 24 and 56 hours after administration and were passed through a Sep-Pak cartridge. The acetylated metabolite [5-(4-acetylaminophenyl)-4-phenyl-2,4-dihydro-3H-1,2,4-triazole-3-thione ], the amine metabolite [5-(4-aminophenyl)-4-phenyl-2,4-dihydro-3H-1,2,4-triazole-3-thione] and an unknown metabolite were detected.

THE IN VIVO METABOLISM OF 5-(4-NITROPHENYL)- 4-PHENYL-2,4-DIHYDRO-3H-1,2,4-TRIAZOLE-3-THIONE IN RATS