细菌偶氮还原研究进展

细菌偶氮还原是在细菌偶氮还原酶作用下偶氮复合物分解为芳香氨的过程,多种细菌都具有偶氮还原功能.有氧条件下细菌的偶氮还原是在特异性的偶氮还原酶作用下完成的,对氧气不敏感.而厌氧菌和兼性厌氧菌的偶氮还原是在厌氧或兼性厌氧条件下由一些氧化还原中间体作为电子穿梭体与偶氮复合物作用的非特性的还原过程.电子穿梭体与偶氮复合物作用是一个纯化学氧化还原过程,其中偶氮复合物作为电子受体接受电子.厌氧偶氮还原是细菌偶氮还原的主要形式.偶氮还原在厌氧-好氧染料废水处理系统和偶氮水溶胶聚合物作为结肠靶向给药载体的研究中有重要应用.图2表1参45

ADVANCE IN BACTERIAL AZOREDUCTION RESEARCH

Bacterial azoreduction is a process that azo dyes are decomposed into aromatic amines by the azoreductase from bacteria. Many kinds of bacteria have the ability of reducing azo dyes. Under aerobic condition, bacterial azoreduction was carried out by special azoreductase, which was not sensitive to oxygen. But under anaerobic condition, bacterial azoreduction was an unspecific process. In this system, azo dyes were catalyzed extracellularly by the redox mediator compounds, which were either secreted during the metabolism of certain substrates by the bacteria themselves or added exogenously. These mediators could transfer redox equivalents from the cell membrane of the bacteria to azo dyes. The action between azo compounds and redox mediator was a pure chemical redox reaction. Moreover, bacterial azoreduction occurred mainly under anaerobic condition. Generally, bacterial azoreduction was applied for the aerobic/anaerobic treatments of dye-containing wastewaters and the research of azo polymeric hydrogels for colon targeted drug delivery. Fig 2, Tab 1, Ref 45