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[ENVIRONMENTAL POLLUTION],卷: 242 页: 462-469
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作者:Zeng, J (Zeng, Jun) ; Zhu, QH (Zhu, Qinghe) ; Wu, YC (Wu, Yucheng) ; Shan, J (Shan, Jun) ; Ji, R (Ji, Rong) ; Lin, XG (Lin, Xiangui) 

 

题目:Oxidation of benzo[a]pyrene by laccase in soil enhances bound residue formation and reduces disturbance to soil bacterial community composition

 

刊物:ENVIRONMENTAL POLLUTION,卷: 242  页: 462-469  子辑: A

DOI: 10.1016/j.envpol.2018.06.075

出版年:NOV 2018

 

文章下载:https://ac.els-cdn.com/S0269749117345943/1-s2.0-S0269749117345943-main.pdf?_tid=b01fc1cc-7d7f-4fc1-8023-fd3a6816c968&acdnat=1541670404_671dd5c5ca8c223e648cc7b5ce004254

 

摘要:

Laccases are capable of rapidly oxidizing benzo[a]pyrene. It is thought that the metabolites with an increase in water solubility caused by the oxidation of benzolalpyrene may stimulate the subsequent mineralization. However, to date, there has been no experimental evidence to support this. In this study, the fate of benzo[a]pyrene in soil affected by laccase amendment and the resulting soil bacterial responses were investigated. Laccase amendment promoted benzo[a]pyrene dissipation (15.6%) from soil, accompanied by trace mineralization (<0.58 +/- 0.02%) and substantial bound residue formation (similar to 80%). An increase of similar to 15% in the bound residue fraction was observed by laccase amendment, which mainly resulted from covalent binding of the residues to humin fraction. During the incubation, the abundance of bacterial 16S rRNA and polycyclic aromatic hydrocarbon ring-hydroxylating dioxygenase genes did not change markedly. In contrast, benzo[a]pyrene treated with laccase resulted in a smaller shift in the bacterial community composition, indicating a reduced disturbance to the soil microbial communities. These results here suggest that benzo[a]pyrene contaminated soil can be detoxified by laccase amendment mainly due to the enhanced bound residue formation to soil organic matter via covalent binding. (C) 2018 Elsevier Ltd. All rights reserved.

 

 

 

 

 


 

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