The metabolic fate of the widely used veterinary drug, furazolidone (N-(5-nitro-2-furfurylidene)-3-amino-2-oxazolidone) was examined in rats. When 14C-furazolidone was administered orally to rats, most of the radioactivity was recovered from urine and feces during the first 24 hr, indicating rapid clearance of the nitrofuran from the animal bodies. The radioactivity in feces appears to be partly due to its biliary excretion and partly due to its exsorption. Two metabolites of the nitrofuran were isolated from the urine and unequivocally identified as 3-(4-cyano-2-oxobutylideneamino)-2-oxazolidone and N-(5-acetamido-2-furfurylidene)-3-amino-2-oxazolidone by comparison with authentic specimens.
广泛使用的兽药
呋喃唑酮(N-(5-硝基-2-糠叉)-3-
氨基-2-恶唌酮)在大鼠体内的代谢命运被进行了研究。当给大鼠口服14C标记的
呋喃唑酮后,大部分放射性在最初的24小时内从尿液和粪便中回收,表明该硝基
呋喃化合物从动物体内迅速清除。粪便中的放射性似乎部分是由于其胆汁排泄,部分是由于其再吸收。从尿液中分离出了两种硝基
呋喃的代谢物,并根据与标准品比较,明确鉴定为3-(4-
氰基-2-氧丁叉
氨基)-2-
恶唑啉酮和N-(5-乙酰胺基-2-糠叉)-3-
氨基-2-恶唉酮。