Silver nanoparticles formation by extracellular polymeric substances (EPS) from electroactive bacteria

Environmental Science and Pollution Research International
Shan-Wei LiGuo-Ping Sheng

Abstract

Microbial extracellular polymeric substances (EPS) excreted from microorganisms were a complex natural biological polymer mixture of proteins and polysaccharides, which played an important roles in the transport of metals, such as Ag(+). Electroactive bacteria, is an important class of environmental microorganisms, which can use iron or manganese mineral as terminal electron acceptors to generate energy for biosynthesis and cell maintenance. In this work, the EPS extracted of three electroactive bacteria (Shewanella oneidensis, Aeromonas hydrophila, and Pseudomonas putida) were used for reducing Ag(+) and forming silver nanoparticles (AgNPs). Results showed that all the three microbial EPS could reduce Ag(+) to AgNPs. The formed AgNPs were characterized in depth by the UV-visible spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The main components in the EPS from the three electroactive bacteria were analyzed. The presence of cytochrome c in these EPS was confirmed, and they were found to contribute to the reduction of Ag(+) to AgNPs. The results indicated that the EPS of electroactive bacteria could act as a reductant for AgNPs synthesis and could provide ...Continue Reading

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Citations

Apr 22, 2017·Angewandte Chemie·Serhii I VasylevskyiMichael Füeg
Apr 26, 2017·Critical Reviews in Microbiology·Ganesan SathiyanarayananYung-Hun Yang
Feb 14, 2017·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Kengo IshikiTsutomu Nagaoka
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Feb 3, 2021·Folia Microbiologica·Ranjana BhatiaGavin Sethi
Sep 9, 2021·Applied and Environmental Microbiology·Vishnu D RajputJonathan R Lloyd

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