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Redox properties of extracellular polymeric substances (EPS) from electroactive bacteria.


ABSTRACT: Although the capacity for electroactive bacteria to convert environmental metallic minerals and organic pollutants is well known, the role of the redox properties of microbial extracellular polymeric substances (EPS) in this process is poorly understood. In this work, the redox properties of EPS from two widely present electroactive bacterial strains (Shewanella oneidensis and Pseudomonas putida) were explored. Electrochemical analysis demonstrates that the EPS extracted from the two strains exhibited redox properties. Spectroelectrochemical and protein electrophoresis analyses indicate that the extracted EPS from S. oneidensis and P. putida contained heme-binding proteins, which were identified as the possible redox components in the EPS. The results of heme-mediated behavior of EPS may provide an insight into the important roles of EPS in electroactive bacteria to maximize their redox capability for biogeochemical cycling, environmental bioremediation and wastewater treatment.

SUBMITTER: Li SW 

PROVIDER: S-EPMC5171820 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Redox properties of extracellular polymeric substances (EPS) from electroactive bacteria.

Li Shan-Wei SW   Sheng Guo-Ping GP   Cheng Yuan-Yuan YY   Yu Han-Qing HQ  

Scientific reports 20161219


Although the capacity for electroactive bacteria to convert environmental metallic minerals and organic pollutants is well known, the role of the redox properties of microbial extracellular polymeric substances (EPS) in this process is poorly understood. In this work, the redox properties of EPS from two widely present electroactive bacterial strains (Shewanella oneidensis and Pseudomonas putida) were explored. Electrochemical analysis demonstrates that the EPS extracted from the two strains exh  ...[more]

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