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首页> 外文期刊>Environmental Science & Technology >Accelerating Quinoline Biodegradation and Oxidation with Endogenous Electron Donors
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Accelerating Quinoline Biodegradation and Oxidation with Endogenous Electron Donors

机译：内源电子给体加速喹啉的生物降解和氧化

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摘要

Quinoline, a recalcitrant heterocyclic compound, is biodegraded by a series of reactions that begin with mono-oxygenations, which require an intracellular electron donor. Photolysis of quinoline can generate readily biodegradable products, such as oxalate, whose bio-oxidation can generate endogenous electron donors that ought to accelerate quinoline biodegradation and, ultimately, mineralization. To test this hypothesis, we compared three protocols for the biodegradation of quinoline: direct biodegradation (B), biodegradation after photolysis of 1 h (P1h+B) or 2 h (P2h +B), and biodegradation by adding oxalate commensurate to the amount generated from photolysis of 1 h (O1+B) or 2 h (O2+B). The experimental results show that Plh+B and P2h+B accelerated quinoline biodegradation by 19% and 50%, respectively, compared to B. Protocols O1+B and O2+B also gave 19% and 50% increases, respectively. During quinoline biodegradation, its first intermediate, 2-hydroxyquinoline, accumulated gradually in parallel to quinoline loss but declined once quinoline was depleted. Mono-oxygenation of 2-hydroxyquinoline competed with mono-oxygenation of quinoline, but the inhibition was relieved when extra electrons donors were added from oxalate, whether formed by UV photolysis or added exogenously. Rapid oxalate oxidation stimulated both mono-oxygenations, which accelerated the overall quinoline oxidation that provided the bulk of the electron donor.
机译：喹啉是一种难降解的杂环化合物，可通过一系列反应进行生物降解，这些反应从单加氧开始，这需要细胞内电子供体。喹啉的光解可产生易于生物降解的产物，例如草酸盐，其生物氧化作用可产生内源性电子供体，该电子给体应加速喹啉的生物降解并最终加速矿化作用。为了验证该假设，我们比较了喹啉的生物降解的三种方案：直接生物降解（B），光解1 h（P1h + B）或2 h（P2h + B）后的生物降解以及通过添加相应量的草酸盐进行生物降解。由1小时（O1 + B）或2小时（O2 + B）的光解产生。实验结果表明，与B相比，Plh + B和P2h + B分别加速了喹啉生物降解19％和50％。方案O1 + B和O2 + B也分别增加了19％和50％。在喹啉生物降解过程中，其第一个中间体2-羟基喹啉与喹啉损失平行地逐渐积累，但一旦耗尽喹啉则下降。 2-羟基喹啉的单加氧与喹啉的单加氧竞争，但是当从草酸盐添加额外的电子供体时，无论是通过紫外线光解还是外源添加，都可以缓解抑制作用。草酸盐的快速氧化刺激了两种单加氧反应，从而加速了整个喹啉氧化，从而提供了大部分电子供体。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11536-11542|共7页
  • 作者

    Qi Bai; Lihui Yang; Rongjie Li; Bin Chen; Lili Zhang; Yongming Zhang; Bruce E. Rittmann;

  • 作者单位

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China;

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China;

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China;

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China;

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China;

    Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, PR China,Guilin Road 100, Shanghai Normal University, Shanghai, 200234, PR China;

    Swette Center for Environmental Biotechnology, Biodesign Institute, Arizona State University, Tempe, AZ 85287-5701, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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