代谢
DNT在大鼠体内的生物活化被认为通过以下过程发生:甲基被氧化为醇,通过细胞色素p450依赖途径;苯甲醇与葡萄糖酸酸结合并在胆汁中排出。肠道微生物群将葡萄糖苷酸水解并还原一个硝基团,形成可以从未肠吸收的氨基硝基苄醇。氨基被肝脏酶氧化为羟胺并与硫酸盐结合。硫酸酯的分解产生一个高度亲电子的硝基正离子(或碳正离子),它可以与DNA和其他生物亲核物质反应。
Bioactivation of DNT in the rat is thought to occur by the following processes: The methyl group is oxidized to an alcohol by a cytochrome p450 dependent pathway; the benzyl alcohol is conjugated with glucoronic acid and excreted in the bile. Intestinal microflora hydrolyze the glucuronide and reduce one nitro group, forming an aminonitrobenzyl alcohol which can be readsorbed from the intestine. The amino group oxidized to an hydroxylamine by hepatic enzymes and conjugated with sulfate. Decomposition of the sulfate ester yields a highly electrophilic nitrenium (or carbonium) ion which can react with DNA and other biological nucleophiles.
来源:Hazardous Substances Data Bank (HSDB)