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Sulfate-Dependent Anaerobic Degradation of Herbicide Acetochlor by a Sulfate-Reducing Bacterium Cupidesulfovibrio sp. SRB-5
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2022-10-05 , DOI: 10.1021/acs.jafc.2c03327 Junwei Liu 1 , Shiyu Zhao 1 , Ningning Wu 1 , Gang Hu 2 , Jiguo Qiu 1 , Jian He 1 , Wenjing Qiao 1
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2022-10-05 , DOI: 10.1021/acs.jafc.2c03327 Junwei Liu 1 , Shiyu Zhao 1 , Ningning Wu 1 , Gang Hu 2 , Jiguo Qiu 1 , Jian He 1 , Wenjing Qiao 1
Affiliation
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Acetochlor, an important chloroacetamide herbicide (CAAH) widely used in agriculture, has resulted in environmental contamination, especially of anoxic habitats. In this study, a sulfate-reducing bacterium, designated as SRB-5, was isolated from anaerobic activated sludge and was identified as Cupidesulfovibrio sp. This bacterium possesses a novel anaerobic pathway capable of degrading acetochlor. In this pathway, sulfate is first reduced to sulfide, which attacks the C–Cl bond of acetochlor and abiotically forms acetochlor-thioalcohol and dis-S-acetochlor. These further undergo microbial degradation, producing the intermediates acetochlor ethanesulfonic acid, 2-methyl-6-ethylaniline, and 2-ethylaniline. The degradation half-times of acetochlor (100 μM) by strain SRB-5 were 2.4 and 4.2 days in industrial wastewater and paddy sludge, respectively. Strain SRB-5 could also degrade alachlor, propisochlor, butachlor, pretilachlor, and metolachlor, and the degradation kinetics fit the pseudo-first-order kinetics equation. This work highlights the potential application of strain SRB-5 for the remediation of CAAHs-contaminated sites.
中文翻译：
硫酸盐还原菌 Cupidesulfovibrio sp. 对除草剂乙草胺的硫酸盐依赖性厌氧降解 SRB-5
乙草胺是一种广泛用于农业的重要氯乙酰胺除草剂 (CAAH)，已导致环境污染，尤其是对缺氧栖息地的污染。在这项研究中，从厌氧活性污泥中分离出一种硫酸盐还原菌，命名为 SRB-5，并被鉴定为Cupidesulfovibrio sp。该细菌具有能够降解乙草胺的新型厌氧途径。在该途径中，硫酸盐首先被还原为硫化物，硫化物攻击乙草胺的 C-Cl 键，非生物地形成乙草胺-硫醇和二硫化物。-S-乙草胺。这些进一步经历微生物降解，产生中间体乙氯乙磺酸、2-甲基-6-乙基苯胺和2-乙基苯胺。菌株SRB-5对乙草胺(100 μM)的降解半衰期分别为2.4天和4.2天，分别在工业废水和水稻污泥中。菌株SRB-5还可以降解甲草胺、丙草胺、丁草胺、丙草胺和异丙甲草胺，降解动力学符合准一级动力学方程。这项工作突出了 SRB-5 菌株在修复 CAAHs 污染场地中的潜在应用。
更新日期：2022-10-05
中文翻译：
硫酸盐还原菌 Cupidesulfovibrio sp. 对除草剂乙草胺的硫酸盐依赖性厌氧降解 SRB-5
乙草胺是一种广泛用于农业的重要氯乙酰胺除草剂 (CAAH)，已导致环境污染，尤其是对缺氧栖息地的污染。在这项研究中，从厌氧活性污泥中分离出一种硫酸盐还原菌，命名为 SRB-5，并被鉴定为Cupidesulfovibrio sp。该细菌具有能够降解乙草胺的新型厌氧途径。在该途径中，硫酸盐首先被还原为硫化物，硫化物攻击乙草胺的 C-Cl 键，非生物地形成乙草胺-硫醇和二硫化物。-S-乙草胺。这些进一步经历微生物降解，产生中间体乙氯乙磺酸、2-甲基-6-乙基苯胺和2-乙基苯胺。菌株SRB-5对乙草胺(100 μM)的降解半衰期分别为2.4天和4.2天，分别在工业废水和水稻污泥中。菌株SRB-5还可以降解甲草胺、丙草胺、丁草胺、丙草胺和异丙甲草胺，降解动力学符合准一级动力学方程。这项工作突出了 SRB-5 菌株在修复 CAAHs 污染场地中的潜在应用。
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