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Updated: May 12, 2025
Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Published on: October 24, 2016
Effect of iron-based oxide-modified electrodes on the selectivity of carbon chain elongation metabolites in
Xiaoyan Sun1, Yanan Yin2, Hui Chen3
1Division of Materials Chemistry and New Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; The State Key Laboratory of Advanced Refractories, Wuhan University of Science & Technology, Wuhan 430081, PR China.
Abstract:
This study explored the electrode modification by iron-based materials (IBM) including Fe2O3, Fe3O4, and FeN in the aim of promoting the medium-chain fatty acids (MCFA) production by electro-fermentation (EF). Results showed that the modification of cathodes with IBM increased MCFA production by 15 %-169 %. FeN exhibited the best performance, achieved the maximum MCFA production of 4450.2 mg COD/L and triggered longer-chain MCFA (i.e., caprylate) production of 211.7 mg COD/L. Electrochemical analyses demonstrated that IBM modification promoted the electrochemical activity of electrodes by reducing the charge transfer resistance by 15-62 %. Microbial analysis illustrated that IBM modification promoted microbial cooperation in the system by enriching chain elongation (CE) functional microorganisms (Fermentimonas sp., Blautia sp. and Anaerosalibacter sp.) and electrochemically active bacteria (Bacillus sp.) to facilitate MCFA generation. Metabolic pathways analysis indicated that IBM modification significantly promoted the production of Acetyl-CoA for the CE process and enhanced the relative abundances of functional genes involved in reverse β-oxidation (RBO) pathway.
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