Mediators-assisted reductive biotransformation of tetrabromobisphenol-A by Shewanella sp XB
Mediators-assisted reductive biotransformation of tetrabromobisphenol-A by Shewanella sp XB
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DOI：
10.1016/j.biortech.2013.04.062
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发表时间：
2013-08-01
影响因子：
11.4
通讯作者：
Zhan, Yaoyao
中科院分区：
文献类型：
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作者：
Wang, Jing;Fu, Zhenzhen;Zhan, Yaoyao
四溴双酚A（TBBPA）的厌氧生物转化主要发生在菌群中。首次研究了广泛分布于环境中的希瓦氏菌（Shewanella sp.）厌氧转化四溴双酚A（TBBPA）过程中氧化还原介质的作用。结果表明，希瓦氏菌XB的黄素分泌对TBBPA的初始浓度有很强的依赖性。当TBBPA浓度增加到80 mg/L时，TBBPA转化的一级速率常数k下降到0.007 d（-1）。此外，添加维生素B12、核黄素、2-羟基-1，4-萘醌和奥德里奇腐殖酸对TBBPA（80 mg/L）的去除效果显著，k值分别为0.42、0.19、0.16和0.07 d（-1）。此外，一些氧化还原蛋白的分泌和发挥作用的黄素介导的细胞外生物转化TBBPA的希瓦氏菌。XB。这些研究结果有助于更好地了解TBBPA在自然环境中的归宿，并制定有效的TBBPA污染的生物处理策略。(C)2013爱思唯尔有限公司保留所有权利。
The anaerobic biotransformation of tetrabromobisphenol A (TBBPA) was mainly observed in the consortia so far. The role of redox mediators in anaerobic TBBPA biotransformation by Shewanella sp. distributed widely in environments was investigated for the first time. The results showed the flavins secretion of Shewanella sp. XB was highly dependent on initial TBBPA concentration. The corresponding first-order rate constants (k) of TBBPA transformation decreased to 0.007 d(-1) when TBBPA concentration increased up to 80 mg/L. Moreover, the removal rate of TBBPA (80 mg/L) was significantly enhanced in treatments amended with cyanocobalamin, riboflavin, 2-hydroxy-1,4-naphthoquinone and Aldrich humic acid with k values of 0.42, 0.19, 0.16, and 0.07 d(-1), respectively. In addition, some redox proteins were secreted and played a role in flavins-mediated extracellular biotransformation of TBBPA by Shewanella sp. XB. These findings are beneficial to better understand TBBPA fate in natural environments and to develop efficient biotreatment strategies of TBBPA pollutions. (C) 2013 Elsevier Ltd. All rights reserved.