From CO₂ to bioplastic – coupling the electrochemical CO₂ reduction with a microbial product generation by drop‐in electrolysis

  • CO2 has been electrochemically reduced to the intermediate formate, which was subsequently used as sole substrate for the production of the polymer polyhydroxybutyrate (PHB) by the microorganism Cupriavidus necator. Faradaic efficiencies (FE) up to 54 % have been reached with Sn‐based gas‐diffusion electrodes in physiological electrolyte. The formate containing electrolyte can be used directly as drop‐in solution in the following biological polymer production by resting cells. 56 mg PHB L−1 and a ratio of 34 % PHB per cell dry weight were achieved. The calculated overall FE for the process was as high as 4 %. The direct use of the electrolyte as drop‐in media in the bioconversion enables simplified processes with a minimum of intermediate purification effort. Thus, an optimal coupling between electrochemical and biotechnological processes can be realized.

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Author:Markus Stöckl, Svenja Harms, Ida Dinges, Steliyana Dimitrova, Dirk HoltmannORCiDGND
Parent Title (German):ChemSusChem
Place of publication:Weinheim
Document Type:Article
Date of Publication (online):2020/07/16
Date of first Publication:2020/07/16
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2020/12/09
Tag:cupriavidus necator; electrochemical CO2 reduction; formate; microbial electrosynthesis; polyhydroxy
Page Number:8
First Page:4086
Last Page:4093
Institutes:Biochemie, Chemie und Pharmazie / Biochemie und Chemie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Licence (German):License LogoCreative Commons - Namensnennung 4.0