Metabolism of 14C-Miloxacin in Rats

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Abstract
Isolation and characterization of metabolites of miloxacin, a new antimicrobial agent, were undertaken with rats. 14C-Miloxacin was orally administered to Sprague-Dawley rats at a dose of 50 mg/kg, and urine, bile and feces were collected. The metabolites extracted from the biological samples were isolated by column and thin-layer chromatographies. Characterization of the isolated metabolites was carried out by comparison with the authentic materials in various physicochemical analyses. Eight metabolites together with intact miloxacin were identified; containing the metabolites of N-demethoxy (M-1), catechol (M-3) and 6-methoxy (M-2 and M-4) types and their conjugates with glucuronic acid.

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