Demethylation of arsenic limits its volatilization in fungi

文献类型： 外文期刊

第一作者： Su, Shiming

作者： Su, Shiming;Zeng, Xibai;Bai, Lingyu;Duan, Ran;Wang, Xiurong;Wu, Cuixia;Wang, Yanan;Feng, Qiufen;Zhang, Lili;Jiang, Sheng;Li, Aiguo

作者机构：

关键词： Demethylation;Fungi;Arsenic;DMA;XAS

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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收录情况： SCI

摘要： Arsenic (As) biomethylation is increasingly being regarded as a promising method to volatize As from the environment; however, the As volatilization efficiency of most microorganisms is low. Here, the speciation transformation of dimethylarsinic acid (DMA) as an important methylation intermediate in the cells of Fusarium oxysporum CZ-8F1, Penicillium janthinellum SM-12F4, and Trichoderma asperelium SM-12F1 were investigated. These fungal strains have been certified to volatilize As from As-loaded environment. In situ X-ray absorption near edge structure (XANES) indicated that demethylation of DMA with methylarsonic acid (MMA), arsenate [As(V)], and arsenite [As(III)] as intermediates or products occurred in fungal cells after exposure to DMA for 15 days. 36.7-55.7% of the original DMA could lose one or two methyl groups and be changed into MMA or inorganic As. Chromatographic separation of the cell lysates also supported these findings. Thus it comes that demethylation might be a remarkable internal factor limiting As volatilization efficiency. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： X5

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