Publication: Succinic acid production with Actinobacillus succinogenes - Influence of an electrochemical assisted fermentation on the intercellular NADH/NAD+ balance

Together with partners from the University of Applied Science in Aaachen the BioVt published the paper "Succinic acid production with Actinobacillus succinogenes - Influence of an electrochemical assisted fermentation on the intercellular NADH/NAD⁺ balance" in the journal Engineering in Life Science.

Bioelectrochemical systems (BES) offer a sustainable method for chemical production, including the enhanced production of succinic acid. By combining fermentation with BES, it could be possible to achieve sustainable succinic acid production and CO₂ fixation using Actinobacillus succinogenes. In literature, the potential application of BES is commonly associated with increased succinate yields, as it is expected to enhance the availability of NADH, thereby influencing the intracellular NADH/NAD⁺ balance. However, it remains unclear whether BES can improve NADH regeneration and achieve higher NADH/NAD+ ratios across all growth phases of A. succinogenes. This study investigates the impact of an applied electrical potential on the intracellular NADH/NAD⁺ ratio during an electrochemical assisted fermentation process. Using an adapted high-performance liquid chromatography method with a Supelcosil LC-18-T column, it was demonstrated that NADH availability in BES, particularly during the stationary growth phase, improved by up to 1.98-fold compared to the control. This enhancement in reducing power led to a succinate yield of 0.747 ± 0.01 g·g^-1, representing a 15.65% increase compared to a fermentation without electrochemical assistance. These findings support the expectation that the use of BES could enhance the competitiveness of bio-based succinate production.

J.-N. Hengsbach, M. Cwienczek, W. Laudensack, J. Stiefelmaier, N. Tippkötter, R. Ulber; Succinic acid production with Actinobacillus succinogenes - Influence of an electrochemical assisted fermentation on the intercellular NADH/NAD⁺ balance; Engineering in Life Sciences (2024) in press