代谢
1,1,2,2-四溴[U-14C]乙烷([14C]TBE)被用来研究TBE在大鼠体内的代谢。三个不同剂量的TBE(1.17、13.6和123毫克/千克;每个剂量1微居里14C/大鼠)通过灌胃给药给三组每组四只大鼠。在不同的时间间隔内收集排泄物样本,直至96小时。安乐死后,测量排泄物、组织和尸体中的14C活性。在高剂量TBE组大鼠中,作为TBE挥发性代谢物(不包括14CO2)呼出的剂量比例大约比低剂量或中剂量TBE组大鼠高9-10%。随着TBE剂量的增加,尿液中排出的比例减少。在高剂量下,确定了1,2-二溴乙烯和三溴乙烯作为呼出的代谢物。确定了三种主要的尿液代谢物:二溴乙酸、乙醛酸和草酸。这项研究的结果表明,TBE的代谢在13.6毫克/千克的剂量下是线性的,但在123毫克/千克的剂量下,各种TBE代谢途径的贡献是不同的。
1,1,2,2-Tetrabromo[U-14C]ethane ([14C]TBE) was used to study the metabolism of TBE in rats. Three graded doses of TBE (1.17, 13.6, and 123 mg/kg; 1 microCi 14C/rat at each dose) were administered by gavage to three groups of four rats each. Excreta samples were collected at various time intervals up to 96 hr. Following euthanization, 14C activity was measured in the excreta, tissues, and carcass. The fraction of the dose exhaled as volatile metabolites of TBE, excluding 14CO2, was approximately 9-10% higher in rats given the high dose of TBE compared to that in rats given either the low or the medium dose. The fraction excreted in the urine decreased with increasing TBE dosage. 1,2-Dibromoethylene and tribromoethylene were identified as exhaled metabolites at the high dose. Three major urinary metabolites were identified: dibromoacetic acid, glyoxylic acid, and oxalic acid. The results of this study indicate that the metabolism of TBE was linear up to a dose of 13.6 mg/kg, but the contribution of various TBE metabolic pathways was different at a dose of 123 mg/kg.
来源:Hazardous Substances Data Bank (HSDB)