New Urinary Metabolites Formed from Ring-Oxidized Metabolic Intermediates of Styrene
作者:Igor Linhart、Jaroslav Mráz、Jan Scharff、Jan Krouželka、Šárka Dušková、Hana Nohová、L’udmila Vodičková
DOI:10.1021/tx9004192
日期:2010.1.18
The ratio of 2-VPMA, 3-VPMA, and 4-VPMA was approximately 2:1:6. In model reactions of styrene 3,4-oxide (3,4-STO) with N-acetylcysteine in aqueous solutions and of its methyl ester in methanol, 4-vinylphenol was always the main product, while 3-vinylphenol has never been detected. No mercapturic acid was found in the reaction of 3,4-STO with N-acetylcysteine in aqueous solution at pH 7.4 or 9.7, but
分析了暴露于苯乙烯蒸气(600和1200 mg / m 3,6 h)的小鼠尿液中苯乙烯的环氧化代谢产物。为方便识别尿液中的代谢物,制备了以下潜在的代谢物:2-,3-和4-乙烯基苯酚(2-,3-和4-VP),4-乙烯基邻苯二酚和2-,3-,和4-乙烯基苯基巯基酸(2-,3-和4-VPMA)。为了分析乙烯酚,将β-葡萄糖醛酸苷酶处理过的尿液萃取并用乙酸酐/三乙胺衍生化,然后注入GC / MS。使用真实标准品,在暴露的尿液中发现了3种异构体2-,3-和4-VP。此外,通过LC-ESI-MS 2鉴定了三种新的次要尿代谢产物芳基巯基酸2-,3-和4-VPMA。通过与真实标准进行比较。最丰富的异构体4-VPMA的排泄量为535±47 nmol / kg和984±78 nmol / kg,分别代表600和1200 mg / m 3暴露水平的吸收剂量的0.047%和0.043%,分别。2-VPMA,3-V