代谢
在口服放射性标记的TXIB后,第一步代谢是水解为母体甘醇2,2,4-三甲基-1,2-戊二醇(TMPD)的单异丁酸盐,由于在粪便中检测到的大部分总剂量都是这种化合物,这可能是发生在胃肠道中的。随后发生了第二次水解,将部分剂量转化为TMPD。在口服255 mg/kg bw剂量的TXIB三天后,检测到的尿液中的主要代谢物是自由的2,2,4-三甲基-3-羟基戊酸(剂量的11.6%)、其葡萄糖苷酸(3.1%)和硫酸盐形式(4.3%),以及TMPD的葡萄糖苷酸(6.5%)、硫酸盐(1.8%)和自由形式(0.5%)。在口服TMPD(196或208 mg/kg bw)48小时后,大鼠尿液中的主要代谢物是TMPD的O-葡萄糖苷酸(剂量的72-73%);尿液中还发现了TMPD的硫酸盐(6.4-6.5%)和自由形式(1-1.7%),以及自由的2,2,4-三甲基-3-羟基戊酸(3%)和其葡萄糖苷酸(4.3-4.4%)。
After an oral dose of radiolabeled TXIB, the first metabolic step was hydrolysis to the monoisobutyrate of the parent glycol 2,2,4-trimethyl-1,2-pentanediol (TMPD), presumably in the gastrointestinal tract since a large proportion of the total dose detected in feces was this compound... A second hydrolysis takes place, transforming some of the dose into TMPD. Major urinary metabolites of TXIB detected three days after an oral dose of 255 mg/kg bw were free 2,2,4-trimethyl-3-hydroxyvaleric acid (11.6% of dose), as well as its glucuronide (3.1%) and its sulfate form (4.3%), and also TMPD in its glucuronide (6.5%), sulfate (1.8%), and free form (0.5%). Forty-eight hours following an oral dose of TMPD (196 or 208 mg/kg bw), the major urinary metabolite in rats was the O-glucuronide of TMPD (72-73% of the dose); other compounds found in the urine were the sulfate (6.4-6.5%) and free (1-1.7%) forms of TMPD, and free 2,2,4-trimethyl-3-hydroxyvaleric acid (3%) and its glucuronide (4.3-4.4%).
来源:Hazardous Substances Data Bank (HSDB)