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Differential regulation of phenanthrene biodegradation process by kaolinite and quartz and the underlying mechanism

机译：高岭石和石英对菲生物降解过程的差异调节及其潜在机理

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摘要

Natural and cost-effective materials such as minerals can serve as supportive matrices to enhance biodegradation of polycyclic aromatic hydrocarbons (PAHs). In this study we evaluated and compared the regulatory role of two common soil minerals, i.e. kaolinite and quartz in phenanthrene (a model PAH) degradation by a PAH degrader Sphingomonas sp. GY2B and investigated the underlying mechanism. Overall kaolinite was more effective than quartz in promoting phenanthrene degradation and bacterial growth. And it was revealed that a more intimate association was established between GY2B and kaolinite. Si and O atoms on mineral surface were demonstrated to be involved in GY2B-mineral interaction. There was an higher polysaccharide/lipid content in the EPS (extracellular polymeric substances) secreted by GY2B on kaolinite than on quartz. Altogether, these results showed that differential bacterial growth, enzymatic activity, EPS composition as well as the interface interaction may explain the effects minerals have on PAH biodegradation. It was implicated that different interface interaction between different minerals and bacteria can affect microbial behavior, which ultimately results in different biodegradation efficiency.
机译：天然和具有成本效益的材料（例如矿物）可以用作支持性基质，以增强多环芳烃（PAH）的生物降解作用。在这项研究中，我们评估并比较了两种常见的土壤矿物，即高岭石和石英在通过PAH降解鞘氨醇单胞菌（Sphingomonas sp。）降解菲（模型PAH）中的调节作用。并研究了GY2B的潜在机制。总的来说，高岭石在促进菲降解和细菌生长方面比石英更有效。并且发现在GY2B和高岭石之间建立了更紧密的联系。矿物表面的Si和O原子被证明与GY2B-矿物相互作用有关。 GY2B在高岭石上分泌的EPS（细胞外聚合物）中的多糖/脂质含量高于石英。总而言之，这些结果表明不同的细菌生长，酶活性，EPS组成以及界面相互作用可能解释了矿物对PAH生物降解的影响。暗示不同矿物质和细菌之间的不同界面相互作用会影响微生物行为，最终导致不同的生物降解效率。

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  • 来源
    《Journal of Hazardous Materials》 |2018年第may5期|51-59|共9页
  • 作者

    Gong Beini; Wu Pingxiao; Ruan Bo; Zhang Yating; Lai Xiaolin; Yu Langfeng; Li Yongtao; Dang Zhi;

  • 作者单位

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

    South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China;

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

    South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China;

    South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    PAH degrader; Mineral; Cell proliferation; Interaction; EPS;

    机译：PAH降解剂;矿物质;细胞增殖;相互作用;EPS;

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