Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 101, Issue 3, Pages 579-586Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/bit.21914
Keywords
endogenous mediator; metabolism regulation; propionibacteria; bioelectrocatalysis; propionate oxidation
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Funding
- Ministry of Education, Science, Sports and Culture of Japan
- Kyoto University
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The end-product profile of the glucose fermentation by Propionibacterium freudenreichii ET-3 changed on an electrochemical treatment, in which the culture vessel was filled with a carbon felt anode. Acetate and propionate were produced as final end products in a molar ratio of 2:3 without any electrochemical treatments at the point of the consumption of lactate as an intermediate of the glucose fermentation. The ratio was changed to 1:1 at the point of the lactate consumption by the electrochemical incubation at an electrode potential of 0.4 V versus Ag vertical bar AgCl for 100 h. During further electrochemical incubation, propionate was oxidized to acetate as a final end-product in the microbecontaining anode chamber. 1,4-Dihydroxy-2-naphthoic acid produced by P. freudenreichii ET-3 itself Would receive electrons from the metabolic pathway and serve as an electron transfer mediator from the microbial cells to the electrode.
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