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分枝杆菌属与绿藻协同作用对苯并[a]芘的强化降解

Enhanced degradation of benzo[a]pyrene by Mycobacterium sp. in conjunction with green alga.

作者信息

Warshawsky David, Ladow Kathy, Schneider Joanne

机构信息

Department of Environmental Health, University of Cincinnati Medical Center, P.O. Box 670056, 3223 Eden Avenue, Cincinnati, OH 45267-0056, USA.

出版信息

Chemosphere. 2007 Sep;69(3):500-6. doi: 10.1016/j.chemosphere.2007.03.031. Epub 2007 Jun 6.

Abstract

Previous work in this laboratory has confirmed that the bacteria Mycobacterium sp. strain RJGII.135 and Sphingomonas yanoikuyae strain B1 and the green alga Selanastrum capricornutum strain UTEX 1648 degrade benzo[a]pyrene (BaP) to various BaP intermediates. S. capricornutum was first grown with BaP for 4 days. The organic extract of this media was then introduced into separate cultures of strain RJGII.135 and strain B1; separate cultures were grown with BaP for comparison. Cultures grown with BaP and those grown with the algal/BaP extract showed similar mineralization patterns. The quantity of total metabolites formed was greater in bacterial cultures grown with the algal/BaP extract than those grown with BaP alone. For strain RJGII.135, only 27% of the original BaP remained in cultures grown with the algal/BaP extract; 59% remained in cultures grown with BaP. For strain B1, only 6% of the original BaP remained in cultures grown with the algal/BaP extract; 38% remained in cultures grown with BaP. These results indicate that strategies utilizing organisms together may be necessary in being able to degrade large, recalcitrant polycyclic aromatic hydrocarbons (PAHs) such as BaP.

摘要

本实验室之前的研究证实,细菌分枝杆菌属菌株RJGII.135和鞘氨醇单胞菌属菌株B1以及绿藻羊角月牙藻菌株UTEX 1648可将苯并[a]芘(BaP)降解为各种BaP中间体。首先让羊角月牙藻与BaP一起培养4天。然后将该培养基的有机提取物引入菌株RJGII.135和菌株B1的单独培养物中;将单独培养物与BaP一起培养以作比较。用BaP培养的培养物和用藻类/BaP提取物培养的培养物显示出相似的矿化模式。用藻类/BaP提取物培养的细菌培养物中形成的总代谢物数量比仅用BaP培养的培养物中更多。对于菌株RJGII.135,在用藻类/BaP提取物培养的培养物中,仅27%的原始BaP残留;在用BaP培养的培养物中,59%残留。对于菌株B1,在用藻类/BaP提取物培养的培养物中,仅6%的原始BaP残留;在用BaP培养的培养物中,38%残留。这些结果表明,在降解诸如BaP之类的大型难降解多环芳烃(PAHs)时,联合利用生物体的策略可能是必要的。

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