Spontaneous assembly of microbial extracellular polymeric substances into microcapsules involved in trapping and immobilizing degradation-resistant oxoanions
文献类型：期刊论文
| 作者 | Wang, Qian; Chen, Kai; Huang, Shuhan; Zhu, Xuezhu; Kang, Fuxing |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2021 |
| 卷号 | 758 |
| 英文摘要 | Despite the ubiquity of microbial extracellular polymeric substances (EPS) in soils and aquatic environments, the roles played by EPS in the nonreductive transformation of toxic and degradation-resistant oxoanions are poorly understood. Here, we used perchlorate, which is ubiquitous in surface environments, as an initiator to study the spontaneous assembly of EPS into microcapsules involved in trapping and immobilizing oxoanions. The results confirmed that ClO4- oxoanions could be rapidly trapped in 20 min by EPS extracted from a common Bacillus subtilis, whereas no chemical reduction of ClO4- occurred in 48 h. Integrated spectroscopic analyses with florescence quenching microtitration and theoretical models showed that amino functionalities of EPS are responsible for sequestering ClO4-, with lower pH values beingmore favorable to formation of EPS-ClO4- micelles. Combined molecular dynamics scheme with wave function analyses showed that besides amino residues, the protonated side-chain amino groups in the basic proteins have a greater capacity for sequestering ClO4- through a noncovalent H-bonding mechanismin which dissociable protons serve as the nodes to bridge ClO4-. A quantitative association between the number of hydrogen bonds and bioavailability revealed that immobilization by EPS mitigates the uptake of toxic oxoanions by forage ryegrass, reducing their risk exposure to edible produce. Main finding of the work: Micelles formed by freely dissolved EPS mitigate the uptake of toxic oxoanions by forage ryegrass (C) 2020 Elsevier B.V. All rights reserved. |
| 源URL | [http://159.226.73.51/handle/332005/20614]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Wang, Qian,Chen, Kai,Huang, Shuhan,et al. Spontaneous assembly of microbial extracellular polymeric substances into microcapsules involved in trapping and immobilizing degradation-resistant oxoanions[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,758. |
| APA | Wang, Qian,Chen, Kai,Huang, Shuhan,Zhu, Xuezhu,&Kang, Fuxing.(2021).Spontaneous assembly of microbial extracellular polymeric substances into microcapsules involved in trapping and immobilizing degradation-resistant oxoanions.SCIENCE OF THE TOTAL ENVIRONMENT,758. |
| MLA | Wang, Qian,et al."Spontaneous assembly of microbial extracellular polymeric substances into microcapsules involved in trapping and immobilizing degradation-resistant oxoanions".SCIENCE OF THE TOTAL ENVIRONMENT 758(2021). |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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