代谢
在这项研究中,考察了影响1-溴丙烷(1-BrP)处置和生物转化的因素,对象是吸入暴露(800 ppm)或静脉注射(5、20和100 mg/kg)后的雄性F344大鼠和B6C3F1小鼠。使用了(1,2,3-13C)1-BrP和(1-14C)1-BrP,通过核磁共振光谱、液相色谱-串联质谱(LC-MS/MS)和高效液相色谱耦合放射性色谱法来表征尿液中的代谢物。呼出的14CO2与释放的总溴化物的摩尔比随着剂量的增加而降低,表明在大鼠中,相对于依赖谷胱甘肽结合的途径,通过氧化代谢的1-BrP比例与剂量成反比。在静脉注射5至100 mg/kg (14C)1-BrP的大鼠和小鼠的尿液中回收到了(14C)1-BrP的等价物(大鼠13-17%,小鼠14-23%),在粪便中(< 2%)或在组织和尸体中保留(< 6%)。在大鼠和小鼠尿液中的代谢物包括N-乙酰-S-丙基半胱氨酸、N-乙酰-3-(丙硫基亚硝基)丙氨酸、N-乙酰-S-(2-羟基丙基)半胱氨酸、1-溴-2-羟基丙烷-O-葡萄糖苷酸、N-乙酰-S-(2-氧代丙基)半胱氨酸和N-乙酰-3-[(2-氧代丙基)硫基亚硝基]丙氨酸。这些代谢物可能是在1-溴丙烷氧化成1-溴-2-丙醇和溴乙酮之后,以及随后与这两种化合物之一进行谷胱甘肽结合形成的。
... In this study, the factors influencing the disposition and biotransformation of 1-bromopropane (1-BrP) were examined in male F344 rats and B6C3F1 mice following inhalation exposure (800 ppm) or intravenous administration (5, 20, and 100 mg/kg). (1,2,3-13C)1-BrP and (1-14C)1-BrP were administered to enable characterization of urinary metabolites using NMR spectroscopy, LC-MS/MS, and HPLC coupled radiochromatography. ... The molar ratio of exhaled 14CO2 to total released bromide, which decreased as dose increased, demonstrated that the proportion of 1-BrP metabolized via oxidation relative to pathways dependent on glutathione conjugation is inversely proportional to dose in the rat. (14C)1-BrP equivalents were recovered in urine (13-17%, rats; 14-23% mice), feces (< 2%), or retained in the tissues and carcass (< 6%) of rats and mice administered iv 5 to 100 mg/kg (14C)1-BrP. Metabolites characterized in urine of rats and mice include N-acetyl-S-propylcysteine, N-acetyl-3-(propylsulfinyl)alanine, N-acetyl-S-(2-hydroxypropyl)cysteine, 1-bromo-2-hydroxypropane-O-glucuronide, N-acetyl-S-(2-oxopropyl)cysteine, and N-acetyl-3-[(2-oxopropyl)sulfinyl]alanine. These metabolites may be formed following oxidation of 1-bromopropane to 1-bromo-2-propanol and bromoacetone and following subsequent glutathione conjugation with either of these compounds ...
来源:Hazardous Substances Data Bank (HSDB)