代谢
大鼠肝脏和肺部的酶系统负责氧化代谢肼衍生物,本研究旨在确定这些酶,细胞色素P450和单胺氧化酶,是否负责代谢激活肼成为致癌/有毒代谢物。细胞色素P450优先氧化1,2-二取代肼和肼酯中的氮-氮键,而单胺氧化酶氧化所有测试的肼衍生物类别中的氮-氮键。氮-氮键的氧化导致1,2-二取代肼的情况下形成稳定的偶氮中间体,而在单取代肼和肼酯的情况下则形成不稳定的单偶氮(重氮烯)代谢物。/取代肼/
The enzyme systems in rat liver and lung responsible for the oxidative metabolism of hydrazine derivatives were studied to determine whether these enzymes, cytochrome p450 and monoamine oxidase, were responsible for metabolically activating hydrazines to carcinogenic/toxic metabolites. Cytochrome p450 preferentially oxidized the nitrogen to nitrogen bond of 1,2-disubstituted hydrazines and hydrazides, while monoamine oxidase oxidized the nitrogen to nitrogen bond of all the classes of hydrazine derivatives that were tested. Oxidation of the nitrogen to nitrogen bond led to the formation of stable azo intemediates in the case of 1,2-disubstituted hydrazines and to unstable monoazo (diazene) metabolites in the case of monosubstituted hydrazines and hydrazides. /Substituted hydrazines/
来源:Hazardous Substances Data Bank (HSDB)