代谢
硝基胍(NG)是军用推进剂和弹药的一个组成部分,在大鼠中对其代谢和处置进行了研究。放射性标记的硝基胍((14C)NG)通过口服给药20和200毫克/千克,以及静脉给药20毫克/千克。无论给药途径如何,所有动物在给药后48小时内尿液中的放射性标记物都被定量回收。尿液色谱分析表明,(14C)NG以原形排出;处理过的动物的呼出空气、粪便或组织中没有发现放射性标记。在NG的处置中没有观察到性别差异。(14C)NG在大剂量动物血液中的动力学被追踪。NG的消除半衰期约为2小时。口服给药的NG的生物利用度为100%;血液中NG的动力学与剂量无关。口服NG后1小时检查组织,发现NG在体内均匀分布。硝基胍是一种低毒化学品(LD50大于5克/千克);它从胃肠道被定量吸收,分布到全身,并迅速通过尿液排出。
The metabolism and disposition of nitroguanidine (NG), a component of military propellants and munitions, were examined in the rat. Radiolabeled nitroguanidine ((14C)NG) was administered orally at doses of 20 and 200 mg/kg and intravenously at a dose of 20 mg/kg. Regardless of the route of administration, the radiolabel was recovered quantitatively in the urine of all animals within 48 hr after dosing. Chromatographic analysis of the urine indicated that the (14C)NG was excreted unchanged; no radiolabel was found in the expired air, feces, or tissues of the treated animals. No sex differences were seen in the disposition of NG. The kinetics of (14C)NG in the blood of the dosed animals was followed. The elimination half-life of NG was on the order of 2 hr. The bioavailability of orally administered NG was 100%; the kinetics of NG in the blood was not dose dependent. Examination of tissues 1 hr after an oral dose of NG showed that NG was evenly distributed throughout the body. Nitroguanidine is a chemical of low toxicity (LD50 greater than 5 g/kg); it is quantitatively absorbed from the gastrointestinal tract, distributed throughout the body, and rapidly excreted in the urine.
来源:Hazardous Substances Data Bank (HSDB)