Reduction of N-nitrosodiphenylamine to the corresponding hydrazine by guinea pig liver preparations.
作者:Kiyoshi Tatsumi、Hiroshi Yamada
DOI:10.1248/cpb.30.3842
日期:——
The present study provides first evidence for enzymatic reduction of a noncyclic nitrosamine to the corresponding hydrazine. Under anaerobic conditions, N-nitrosodiphenylamine was reduced to 1, 1-diphenylhydrazine by guinea pig liver 9, 000xg supernatant or cytosol in the presence of an NADPH-generating system and FAD, or NADH and FAD. However, guinea pig liver microsomes did not catalyze the reduction of the nitrosamine at all. The reduction product was isolated from the reaction mixture and identified unequivocally by comparing with authentic samples its mass and UV spectra, and its behavior in HPLC and TLC. Under aerobic conditions, no formation of the hydrazine was observed by HPLC and TLC examinations. However, when aerobic incubation was performed in the presence of acetaldehyde, a reduction product was isolated and identified as the acetaldehyde hydrazone derivative.
本研究首次提供了非环状亚硝胺通过酶促还原生成相应肼的证据。在厌氧条件下,N-亚硝基二苯胺在产生NADPH的系统和FAD或NADH和FAD的作用下,通过豚鼠肝脏9000xg上清液或胞浆被还原为1,1-二苯肼。然而,豚鼠肝脏微粒体完全没有催化亚硝胺的还原。还原产物从反应混合物中分离出来,并通过与真品样品的质量和紫外光谱以及其在HPLC和TLC中的行为进行比较,从而明确鉴定。在好氧条件下,通过HPLC和TLC检查未观察到肼的形成。然而,当在有乙醛存在的情况下进行好氧培养时,分离出还原产物并鉴定为乙醛腙衍生物。