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Phanerochaete chrysosporium-driven quinone redox cycling promotes degradation of imidacloprid
International Biodeterioration & Biodegradation ( IF 4.1 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ibiod.2020.104965
Qingru Xie , Chao Xue , Anwei Chen , Cui Shang , Si Luo

Abstract This study systematically investigated the advanced oxidation processes driven by the white-rot fungus (WRF) Phanerochaete chrysosporium in the removal of the neonicotinoid pesticide imidacloprid (IMI). The quinone redox cycling driven by P. chrysosporium promotes the degradation of IMI in presence of Mn2+ and Fe (III)-oxalate. Results showed that the degradation efficiency varied with the type of quinine mediator, and gallic acid (GA) was a more effective mediator than 1,4-benzoquinone (BQ). The removal rate of IMI was increased by 1.8-fold in the presence of 100 μM of Mn2+ compared with that of the system without Mn2+. The addition of oxalic acid and EDTA promoted the degradation of IMI, and the effect of oxalic acid was more pronounced at the later stage (day 5 and day 6); the optimal Fe3+/oxalate ratio was 1:3. Time-course experiments revealed the maximum removal rates of IMI were 97.37%, 82.0% and 73.52% at the initial IMI concentration of 10, 20, and 30 mg/L, respectively, in the presence of 100 μM Mn2+, 100 μM Fe3+-300 μM of oxalate and 500 μM gallic acid. Under quinone redox cycling conditions, the good correlation between ·OH production rates and the enzymes activity was concluded, the quinines redox cycles promote enzyme activity, as well as the rate of ·OH production. Results from this study indicated the GA mediator-based system using P. chrysosporium offers a new method to advance the bio-oxidation process owing to its simple culture system, low-cost precursors, unique fungi, and degradation stability.

中文翻译:

Phanerochaete chrysosporium 驱动的醌氧化还原循环促进吡虫啉的降解

摘要 本研究系统地研究了由白腐真菌 (WRF) Phanerochaete chrysosporium 驱动的高级氧化过程在去除新烟碱类农药吡虫啉 (IMI) 中的作用。在 Mn2+ 和 Fe (III)-草酸盐存在下,由 P. chrysosporium 驱动的醌氧化还原循环促进了 IMI 的降解。结果表明,降解效率随奎宁介质类型的不同而变化,而没食子酸 (GA) 是比 1,4-苯醌 (BQ) 更有效的介质。与不含 Mn2+ 的系统相比,在 100 μM Mn2+ 存在下,IMI 的去除率提高了 1.8 倍。草酸和EDTA的加入促进了IMI的降解,后期(第5天和第6天)草酸的作用更明显;Fe3+/草酸盐的最佳比例为1:3。时程实验表明,当初始 IMI 浓度为 10、20 和 30 mg/L 时,在 100 μM Mn2+、100 μM Fe3+- 存在下,IMI 的最大去除率分别为 97.37%、82.0% 和 73.52% 300 μM 草酸盐和 500 μM 没食子酸。在醌氧化还原循环条件下,·OH产率与酶活性之间具有良好的相关性,奎宁氧化还原循环促进了酶活性,以及​​·OH产率。这项研究的结果表明,使用 P. chrysosporium 的基于 GA 介体的系统由于其简单的培养系统、低成本的前体、独特的真菌和降解稳定性,提供了一种促进生物氧化过程的新方法。在 100 μM Mn2+、100 μM Fe3+-300 μM 草酸盐和 500 μM 没食子酸存在下。在醌氧化还原循环条件下,·OH产率与酶活性之间具有良好的相关性,奎宁氧化还原循环促进了酶活性,以及​​·OH产率。这项研究的结果表明,使用 P. chrysosporium 的基于 GA 介质的系统由于其简单的培养系统、低成本的前体、独特的真菌和降解稳定性,提供了一种促进生物氧化过程的新方法。在 100 μM Mn2+、100 μM Fe3+-300 μM 草酸盐和 500 μM 没食子酸存在下。在醌氧化还原循环条件下,·OH产率与酶活性之间具有良好的相关性,奎宁氧化还原循环促进酶活性,以及​​·OH产率。这项研究的结果表明,使用 P. chrysosporium 的基于 GA 介质的系统由于其简单的培养系统、低成本的前体、独特的真菌和降解稳定性,提供了一种促进生物氧化过程的新方法。
更新日期:2020-07-01
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