代谢
直到1983年,关于TBT代谢的信息非常有限,当时进行了一项广泛的研究... TBT通过胃内给药的方式给予大鼠和豚鼠,剂量为100 mg/kg,并使用气相色谱和质谱法分析了经葡萄糖醛酸酶-磺酸酶处理后的尿液中TBT的代谢物。在这项研究中,对-叔丁基苯甲酸及其醇衍生物,2-(对-羧基苯基)-2-甲基丙醇-1被确认为大鼠中的主要尿代谢物(占总剂量的17-22%),而在豚鼠中,对-叔丁基苯甲酰甘氨酸被发现是最显著的代谢物(占总剂量的34%)。在大鼠尿液中发现的次要代谢物(占总剂量的2-4%)是2-甲基-2-对甲苯基丙醇-1和对-叔丁基苯甲酰甘氨酸,而在豚鼠中是p-叔丁基苯甲酸、2-甲基-2-对甲苯基丙醇和2-甲基-2-对甲苯基丙酸,在大鼠中根本没有检测到。在大鼠和豚鼠尿液中都发现了微量的p-叔丁基苄醇(小于总剂量的0.5%)。2-(对-羧基苯基)-2-甲基丙酸,一种微量的物质,仅在鼠尿液中检测到。当通过吸入给药时,也发现了TBT的类似代谢。在这种情况下,在大鼠尿液中未能在胃内给药后检测到的2-(对-羧基苯基)-2-甲基丙醇-1的微量被检测到豚鼠尿液中。
Little information had been available on the metabolism of TBT until 1983, when an extensive study was conducted ... TBT /was administered/ to rats and guinea pigs intragastrically at a dose of 100 mg/kg and analyzed metabolites of TBT in glucuronidase-sulfatase-treated urine using gas chromatographic and mass spectrometric methods. In this study, p-tert-butylbenzoic acid and its alcohol derivative, 2-(p-carboxyphenyl)-2-methylpropan-1-ol, were identified as the major (17-22% of dose) urinary metabolites in rats, whereas p-tert-butylbenzoylglycine was found to be the most prominent metabolite (34% of dose) in guinea pigs. Minor metabolites (2-4% of dose) found in rat urine were 2-methyl-2-p-tolyl-propan-1-ol and p-tert-butylbenzoylglycine , while those in the guinea pig were p-tert-butylbenzoic acid, 2-methyl-2-p-tolylpropan-1-ol, and 2-methyl-2-p-tolylpropionic acid which was not detected at all in rats. Trace amounts (<0.5% of dose) of p-tert-butylbenzyl alcohol were found both in rat and guinea pig urine. 2-(p-Carboxyphenyl)-2-methylpropionic acid, a trace amount, was detected only in rat urine. Similar metabolism of TBT was also found when the chemical was given by inhalation. In this case, trace amounts of 2-(p-carboxyphenyl)-2- methylpropan-1-ol, which was not identified after intragastric administration, was detected in the urine of guinea pigs.
来源:Hazardous Substances Data Bank (HSDB)