六价铬
胞外聚合物
生物膜
化学
铬
胞外多糖
多糖
细胞外
核化学
水溶液
细菌
微生物学
食品科学
生物化学
生物
有机化学
遗传学
作者
Annapurna Maurya,Rajesh Kumar,Pooja Yadav,Anjali Singh,Ashutosh Yadav,Pankaj Chowdhary,Abhay Raj
标识
DOI:10.1016/j.biortech.2022.127109
摘要
Biofilm-forming bacteria play a key role in the removal of heavy metals including hexavalent chromium [Cr(VI)] from contaminated sites. In this study, biofilm-forming B. haynesii was examined for extracellular polymeric substances (EPS) production and hexavalent chromium [Cr(VI)] reduction potential. Exposure of B. haynesii with Cr(VI) (12.5-100 mg L-1) for 48 h enhanced pellicle dry weight (20-24%), cell-size (5.1-23.2%) and cell granularity (8.5-19.2%). Also, EPS production was increased by 10-35% by promoting the synthesis of protein (94-119%) and polysaccharide (2-33%) components in EPS. Further, the reduction (27.7 %) and distribution (15.87%) of Cr(VI) were mainly mediated by EPS than the other cellular fractions. Findings of the study suggest that the EPS from B. haynesii was efficiently reduced to Cr(VI) present in aqueous medium and the potential of the organism can be further explored for the mitigation of Cr(VI) contamination.
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