代谢
研究了2,4-D的2-乙基己酯在单次口服给药130 mg/kg体重剂量后,对雄性和雌性Fischer 344大鼠的药代动力学。从每性别的24只大鼠中,以0.25、0.5、1、2、4、8、24和72小时的间隔,每组3只大鼠的连续小组中抽取血液样本,并从72小时组的每12小时间隔收集尿液。此次评估中最显著的发现是在所评估的任一性别的血液或尿液中都没有检测到2-乙基己酯的2,4-D(定量限为10 ppb)。相反,2,4-D酸在血液和尿液中都被检测到。现有数据表明,2,4-D的2-乙基己酯非常迅速地转化为2,4-D酸,然后酸被排入尿液中。排泄数据的间隔与之前对2,4-D酸的调查研究所见相似。迹象表明,2,4-D酸很可能是通过2-乙基己酯部分的水解产生的,并以与口服给药的2,4-D酸相同的方式从体内排出。因此,根据这些结果预计,2,4-D的2-乙基己酯在毒理学上应与2,4-D酸本身相当。
The pharmacokinetics of the 2-ethylhexyl ester of 2,4-D were investigated following a single oral administration of 130 mg/kg body weight dose to both male and female Fischer 344 rats. Blood samples were drawn from 24 rats per sex in serial groups of 3 at intervals of 0.25, 0.5, 1, 2, 4, 8, 24, and 72 hours post dosing and urine was collected from the 72 hours group at 12 hour intervals. The most significant finding from this evaluation was the absence of any 2-ethylhexyl ester of 2,4-D in either the blood or urine for either sex evaluated (limit of quantification 10 ppb). Conversely 2,4-D acid was detected in both blood and urine. The present data indicate that the 2-ethylhexyl ester of 2,4-D is converted very rapidly to 2,4-D acid, and that the acid is then excreted into the urine. A similarity exists in interval excretion data with that seen in previous investigations with 2,4-D acid. Indications are that the 2,4-D acid is probably derived via the hydrolysis of the 2-ethylhexyl ester moiety and is eliminated from the body in the same manner as the orally administered 2,4-D acid. It is therefore anticipated from these results that the 2-ethylhexyl ester of 2,4-D should be toxicologically comparable to 2,4-D acid itself.
来源:Hazardous Substances Data Bank (HSDB)