代谢
在大鼠代谢研究中,将三唑啉酮-3-(14)C (MKH 3586,即氨甲酸唑)的水溶液以5.25至5.99毫克/千克的剂量单次灌胃给予4只雄性Fischer大鼠。给药后72小时内,放射性剂量的总体回收率为95%。大部分剂量在给药后24小时内通过尿液排出(64%的剂量),表明吸收量很大。在给药后24小时内,通过粪便排出的剂量占27%。给药24小时后,只有2%的剂量通过排泄物回收。在给药后72小时,选定的组织中放射性浓度较低(0.004至0.073微克/克)。使用高效液相色谱(HPLC)和液相色谱-串联质谱(LC-MS/MS)分析,在大鼠排泄物中鉴定出了母体和9种代谢物。在排泄物中鉴定出的化合物占剂量的74%。在尿液(大约2%的剂量)和粪便(小于1%的剂量)中检测到少量的母体。排泄物中的主要代谢物是母体的羟基化、脱氨衍生物,即iPr-2-OH DA (34%的剂量),主要在尿液中找到(32%的剂量)。还鉴定出了其他羟基化脱氨衍生物:tBu-OH DA (尿液中11%的剂量和粪便中4%的剂量),以及iPr-1,2-di-OH DA (尿液中6%的剂量和粪便中小于1%的剂量)。母体的葡萄糖醛酸结合物,MKH 3586 GA,占剂量的11%,主要在粪便中(10%的剂量)。在排泄物中鉴定出的其他代谢物(每种小于或等于3%的剂量)包括:tBu-1,2-di-iPr-tri-OH DA;tBu-iPr-di-OH DA;iPr-1,3-diOH DA;tBu-OH-iPr-ene和DA。根据代谢轮廓,MKH 3586在雄性大鼠中的代谢主要涉及脱氨,随后是羟基化,并通过尿液排出。母体也发生葡萄糖醛酸结合并在粪便中排出。
In a rat metabolism study ... (triazolinone-3 (14)C) MKH 3586 (amicarbazone ... radiochemical purity > 99%) in water was admin to 4 male Fischer rats as a single gavage dose at 5.25 to 5.99 mg/kg ... Overall recovery of the radioactive dose was 95% by 72 hr following admin. The majority of the dose was recovered in the urine within 24 hr (64% dose), indicating substantial absorption. Fecal excretion accounted for 27% dose within 24 hr post-dose. Only 2% dose was recovered in the excreta after 24 hr ... Concn of radioactivity in the selected tissues at 72 hr post-dose were low (0.004 to 0.073 ug/g). HPLC and LC-MS/MS analysis were used to identify parent and 9 metabolites in excreta from male rats ... Identified cmpd in excreta accounted for 74% of the dose ... Minor amt of parent were detected in both urine (approximately 2% dose) and feces (< 1% dose). The major metabolite in excreta was a hydroxylated, deaminated derivative of the parent, iPr-2-OH DA (34% dose), mainly found in the urine (32% dose). Other hydroxylated deaminated derivatives were also identified: tBu-OH DA (11% dose in urine and 4% dose in feces), and iPr-1,2-di-OH DA (6% dose in urine and < 1% dose in feces). The glucuronic acid conjugate of the parent, MKH 3586 GA, accounted for 11% dose, mainly in the feces (10% dose). Other metabolites (each < or = 3% dose) identified in excreta included: tBu-1,2-di-iPr-tri-OH DA; tBu-iPr-di-OH DA; iPr-1,3-diOH DA; tBu-OH-iPr-ene and DA. Based on the metabolic profile, the metabolism of MKH 3586 in male rats primarily involves deamination followed by hydroxylation with elimination in the urine. Parent also undergoes glucuronic acid conjugation and elimination in the feces.
来源:Hazardous Substances Data Bank (HSDB)