代谢
在用1,2-DBP处理12小时后,通过液相色谱-电喷雾串联质谱(LC-ESI/MS)在肝脏中鉴定出了以下四种代谢物:M1,2-羟基丙基谷胱甘肽;M2,2-氧代丙基谷胱甘肽;M3,N-乙酰-S-(2-羟基丙基)-L-半胱氨酸;M4,N-乙酰-S-(2-氧代丙基)-L-半胱氨酸。各个结合物的离子分别在m/z 366、364、222和220处观察到。特征性产物离子在m/z 237、217、204和202处分别用于鉴定M1、M2、M3和M4。从同一动物的血清中分离出的血清中,通过LC-ESI/MS仅观察到巯基尿酸(M3和M4)。当雌性BALB/c小鼠口服1,2-DBP剂量为150、300和600 mg kg(-1)一次处理12小时时,肝脏中谷胱甘肽结合物和巯基尿酸的产生明显呈剂量依赖性,血清中它们的浓度也是如此。当调查雌性BALB/c小鼠口服600 mg kg(-1) 1,2-DBP处理6、12、24和48小时后肝脏中1,2-DBP代谢物的产生时,代谢物浓度在第一个时间点(6小时)最高。
... The following four metabolites were identified in the liver at 12 h after treatment with 1,2-DBP, by liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI/MS): M1, 2-hydroxypropylglutathione; M2, 2-oxopropylglutathione; M3, N-acetyl-S-(2-hydroxypropyl)-L-cysteine; and M4, N-acetyl-S-(2-oxopropyl)-L-cysteine. Ions of individual conjugates were observed at m/z 366, 364, 222 and 220, respectively. Characteristic product ions at m/z 237, 217, 204 and 202 for the identification of M1, M2, M3 and M4 were observed, respectively. In the sera isolated from the same animals, only mercapturic acids (M3 and M4) were observed by LC-ESI/MS. When female BALB/c mice were treated orally with 1,2-DBP at doses of 150, 300 and 600 mg kg(-1) once for 12 h, the production of glutathione conjugates and mercapturic acids in liver was apparently dose dependent, as were the concentrations of them in sera. When the production of metabolites from 1,2-DBP was investigated in liver following oral treatment with 600 mg kg(-1) 1,2-DBP for 6, 12, 24 and 48 h, metabolite concentrations were greatest at the first time point (6 h).
来源:Hazardous Substances Data Bank (HSDB)