Enhancement of anaerobic lysine production in Corynebacterium glutamicum electrofermentations
Artikel i vetenskaplig tidskrift, 2017

It has been suggested that application of electric potential can affect lysine producing fermentations, although experimental evidence is lacking. To study this hypothesis we used the lysine producer Corynebacterium glutamicum ZW04, and we exposed it to 12 different conditions regarding anaerobic gas environment, applied electrode potential (cathodic, open circuit, anodic), redox mediator and nitrate presence. The gas environment was found to play a major role, with CO2 leading to double the lysine concentrations and yields when compared to N2. Electrode potentials also played a major role, with reductive conditions doubling the titers and increasing the yields of lysine up to 4 times. Addition of the redox mediator anthraquinone-2-sulfonate (AQ2S) under the presence of CO2 and reductive conditions led to additional doubling of the titers, although the yields were not altered considerably. This study demonstrates for the first time that cathodic electrode conditions combined with CO2 and AQ2S as a redox mediator can significantly improve both the yields and the titers of lysine production of a C. glutamicum lysine producing strain, reaching levels that have only been achieved under aerobic conditions.

lysine

electrofermentations

Corynebacterium glutamicum

anthraquinone-2-sulfonate

biocathodes

Författare

Nikolaos Xafenias

Chalmers, Biologi och bioteknik, Industriell bioteknik

Cathleen Kmezik

Chalmers, Biologi och bioteknik, Industriell bioteknik

Valeria Mapelli

Chalmers, Biologi och bioteknik, Industriell bioteknik

Bioelectrochemistry

1567-5394 (ISSN)

Vol. 117C 40-47

Förädling av inhemska förnybara råvaror till värdefulla bulk- och finkemikalier för en biobaserad samhällsekonomi: teknikutveckling, systemintegration och miljöeffekter (BioBuF)

Formas, 2013-06-17 -- 2018-12-31.

Västra Götalandsregionen, Regionutvecklingssekretariatet, 2013-11-01 -- 2018-10-31.

Ämneskategorier

Oorganisk kemi

Biologiska vetenskaper

Miljöbioteknik

Styrkeområden

Energi

DOI

10.1016/j.bioelechem.2017.06.001