Rice straw hydrolysate to fuel and volatile fatty acid conversion by Clostridium sporogenes BE01: bio-electrochemical analysis of the electron transport mediators involved

Title

Rice straw hydrolysate to fuel and volatile fatty acid conversion by Clostridium sporogenes BE01: bio-electrochemical analysis of the electron transport mediators involved

Author

Lalitha Devi Gottumukkala,*^ac   Rajeev Kumar Sukumaran,^a  S. Venkata Mohan,^b   Sajna Kuttuvan Valappil,^a  Omprakash Sarkar^b and   Ashok Pandey^a  

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Green Chem., 2015,17, 3047-3058

DOI: 10.1039/C5GC00310E
Received 09 Feb 2015, Accepted 13 Mar 2015
First published online 18 Mar 2015

Clostridium sporogenes BE01, a non-acetone forming butanol producer, can produce hydrogen and volatile fatty acids (VFAs) during butanol fermentation from rice straw hydrolysate. Bio-electrochemical analysis revealed the changes that occurred in the redox microenvironment and electron transport mediators during fermentation at different pH and CaCO₃ concentrations. CaCO₃ played a very important role in enhancing the production of hydrogen, volatile fatty acids and solvents by stimulating the changes in the electron transport system. The electron transport system mediated by NAD/NADH, flavins, Fe–S clusters, protein bound FAD, and cytochrome complex in C. sporogenes BE01 was analysed by cyclic voltammetry (CV). Electrokinetic analysis revealed that the favorability for redox reactions increased with an increase in pH, and the polarization resistance reduced significantly with CaCO₃ supplementation.

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http://pubs.rsc.org/en/content/articlelanding/2015/gc/c5gc00310e