Biotechnology Bulletin ›› 2021, Vol. 37 ›› Issue (5): 237-247.doi: 10.13560/j.cnki.biotech.bull.1985.2020-1054

Previous Articles     Next Articles

Principle and Research Progress in Microbial Electrosynthesis of Medium-chain Fatty Acids

CHU Na(), JIANG Yong(), ZENG Jian-xiong   

  1. Fujian Agriculture and Forestry University,Fuzhou 350002
  • Received:2020-08-19 Online:2021-05-26 Published:2021-06-11
  • Contact: JIANG Yong E-mail:cn609fafu@yeah.net;jiangyongchange@163.com

Abstract:

Microbial electrosynthesis(MES)is a novel microbial electrochemical technology,which utilizes the electric energy to drive the microbial production of organic compounds from water and CO2 under mild conditions. Medium-chain fatty acids(MCFAs)are defined as saturated monocarboxylic acids with a carbon chain in the range from C6 to C12,and are important chemicals with various industrial and agricultural applications. Microbial production of MCFAs usually involves the primary and secondary fermentation process. Primary fermentation is the conversion of monomers and polymers into pyruvic acid as intermediate to produce short chain fatty acids,alcohols,H2,and CO2 as the final products. Secondary fermentation is the further reuse of the final products from primary fermentation,including the chain elongation for MCFAs production. MCFAs production in MES is expected to obtain a higher energy efficiency than that of traditional anaerobic fermentation of organic waste,and is also expected to promote the practical application of MES technology itself with high value-added products. This paper reviews recent advances of MCFAs production in MES,by integrating the catalytic conversion of C1 waste gas with secondary fermentation(chain elongation),and discusses the metabolic pathways,functional microorganisms,electrode materials,as well as key operating parameters,aiming to provide important scientific and technical support for further development of MCFAs production in MES.

Key words: microbial electrosynthesis, chain elongation, medium-chain fatty acids, C1 waste gas