An unstable epoxy intermediate formed by the microsomal oxidation of 4-nitrophenyl vinyl ether.
作者:MASAKAZU ISOBE、TOMOMICHI SONE、EIGO TAKABATAKE
DOI:10.1248/cpb.36.2267
日期:——
An epoxy intermediate, 2-(4-nitrophenoxy)oxirane (NPO), previously proposed to be a shortlived intermediate in the microsomal metabolism of 4-nitrophenyl vinyl ether (NPVE), was isolated by high-performance liquid chromatography and identified by mass spectrometric comparison with an authentic specimen. NPO decomposed to glycolaldehyde and 4-nitrophenol with a half life of 4.6min in 0.1M phosphate buffer, pH7.4, at 37°C. The hydrolytic decomposition was accelerated by the addition of rat hepatic microsomes, but the accelerating effect was reduced by the addition of 3, 3, 3-trichloropropene oxide, a microsomal epoxide hydrolase inhibitor.These results indicate that NPO is an obligatory intermediate in the microsomal conversion of NPVE to glycolaldehyde and 4-nitrophenol.
通过高效液相色谱法分离出了一种环氧中间体--2-(4-硝基苯氧基)环氧乙烷(NPO),并通过质谱法与真实样本进行了对比鉴定,该中间体之前被认为是 4-硝基苯乙烯基醚(NPVE)微粒体代谢过程中的一种短效中间体。在 37°C 的 0.1M 磷酸盐缓冲液(pH7.4)中,NPO 分解为乙醛和 4-硝基苯酚,半衰期为 4.6 分钟。加入大鼠肝脏微粒体可加速水解分解,但加入微粒体环氧化物水解酶抑制剂 3,3,3-三氯氧化丙烯后,加速作用减弱。