Extracellular polymeric substance from Rahnella sp. LRP3 converts available Cu into Cu5(PO4)2(OH)4 in soil through biomineralization process.,Environmental Pollution

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Extracellular polymeric substance from Rahnella sp. LRP3 converts available Cu into Cu5(PO4)2(OH)4 in soil through biomineralization process.
Environmental Pollution ( IF 7.6 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.envpol.2020.114051
Hoaithuong Do ₁ , Chi Che ₁ , Zijun Zhao ₁ , Yuqi Wang ₁ , Mingtang Li ₁ , Xiufang Zhang ₁ , Xingmin Zhao ₁

Affiliation

Soil contamination by toxic heavy metals such as copper is a serious problem. In this study, the extracellular polymeric substance (EPS) extracted from Rahnella sp. LRP3 was found with the potential of immobilizing Cu-polluted in soil. The EPS could bond to Cu (II) through functional groups (polysaccharides, amide, proteins, and carboxyl groups), which further developed into the porous sphere with a diameter of 20 μm. Besides, EPS could induce the formation of Cu5(PO4)2(OH)4 crystal by the biomineralization process. Finally, the EPS in the culture solution reduced 89.4 mg/kg of DTPA-Cu content by 78.99% in soil for 10 d under the condition of 25 °C via biomineralization. The results demonstrated that EPS produced by Rahnella sp. LRP3 will be a promising factor in the remediation of Cu contaminated soil.

中文翻译：

来自Rahnella sp。的细胞外聚合物。LRP3通过生物矿化过程将土壤中可用的Cu转化为Cu5（PO4）2（OH）4。

铜等有毒重金属污染土壤是一个严重的问题。在这项研究中，细胞外聚合物（EPS）提取自Rahnella sp。发现LRP3具有固定土壤中Cu污染的潜力。EPS可以通过官能团（多糖，酰胺，蛋白质和羧基）与Cu（II）结合，然后进一步发展为直径20μm的多孔球体。此外，EPS可以通过生物矿化过程诱导形成Cu5（PO4）2（OH）4晶体。最后，在25℃条件下，通过生物矿化，培养液中的EPS在10 d的时间内使土壤中DTPA-Cu的89.4 mg / kg含量降低了78.99％。结果表明，Rahnella sp。产生的EPS。LRP3将是修复铜污染土壤的有希望的因素。

更新日期：2020-01-23

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