Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes.

Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes. Research Abstract Details 

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Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes. Abstract Text:

Yung-Fu Wang,Seiya Tsujimura,Sheng-Shung Cheng,Kenji Kano,Yung-Fu Wang,Seiya Tsujimura,Sheng-Shung Cheng,Kenji Kano,

Escherichia coli K-12 was cultured under anaerobic conditions to form biofilm on carbon fiber electrodes in glucose-containing medium. The anodic current increased with the development of the biofilm and depended on the glucose concentration. Cyclic voltammetric results support the presence of a redox compound(s) excreted from E. coli cells in the biofilm. The compound remained in the film under conditions of continuous flow and gave a couple of oxidation and reduction waves, which may be assigned to a menaquinone-like compound based on the mid-point potential (-0.22 V vs Ag|AgCl at pH 7.1) and its pH dependence. The catalytic current started to increase around the anodic peak potential of the redox compound and also increased by the permeabilization of the E. coli cell membranes with ethylenediamine tetraacetic acid-treatment. The results indicate that the E. coli-excreted redox compound works as a mediator for the electron transfer from the E. coli cells to the electrode as the final electron acceptor. The activity of the redox compound in the E. coli-biofilm as a mediator with some mobility was also verified for diaphorase-catalyzed electrochemical oxidation of NADH.

Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes. Publishing Authors By Initials

YF Wang,S Tsujimura,SS Cheng,K Kano,YF Wang,S Tsujimura,SS Cheng,K Kano,

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Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Applied microbiology and biotechnology

VOLUME: 76

Page Numbers: 1439-46

Journal Abbreviation: Appl. Microbiol. Biotechnol.

ISSN: 0175-7598

DAY: 31

MONTH: 07

YEAR: 2007

Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Self-excreted mediator from Escherichia coli K-12 for electron transfer to carbon electrodes.

AFFILIATION: Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.

Country: Germany

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MEDLINETA: Appl Microbiol Biotechnol

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