Enhanced electron transfer of different mediators for strictly opposite shifting of metabolism in Clostridium pasteurianum grown on glycerol in a new electrochemical bioreactor

Biotechnology and Bioengineering - Tập 116 Số 7 - Trang 1627-1643 - 2019
Tyll Utesch1, Wael Sabra1, Christin Prescher1, Julian Baur1, Philipp Arbter1, An‐Ping Zeng2,1
1Institute of Bioprocess and Biosystems Engineering, Hamburg University of Technology Denickestrasse, Hamburg, Germany
2Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Chaoyang District, Beijing, China

Tóm tắt

AbstractMicrobial electrosynthesis or electro‐fermentation in bioelectrochemical systems (BES) have recently received much attention. Here, we demonstrate with the glycerol metabolism by Clostridium pasteurianum that H 2 from in situ water electrolysis, especially in combination with a redox mediator, provides a simple and flexible way for shifting product selectivity and enhancing product yield in the fermentation process. In particular, we report and quantify for the first time strictly different effects of Neutral Red (NR) and the barely studied redox mediator Brilliant Blue (BB) on the growth and product formation of C. pasteurianum grown on glycerol in a newly developed BES. We were able to switch the product formation pattern of C. pasteurianum with a concentration‐dependent addition of NR and BB under varied iron availability. Interestingly, NR and BB influenced the glycerol metabolism in a strictly opposite manner concerning the formation of the major products 1,3‐propanediol (1,3‐PDO) and n‐butanol (BuOH). Whereas, NR and iron generally enhance the formation of BuOH, BB favors the formation of 1,3‐PDO. In BES the metabolic shifts were enhanced, leading to a further increased yield by as high as 33% for BuOH in NR fermentations and 21% for 1,3‐PDO in BB fermentations compared with the respective controls. For the first time, the electron transfer mediated by these mediators and their recycle (recharge) were unambiguously quantified by excluding the overlapping effect of iron. BB has a higher capacity than NR and iron. The extra electron transfer by BB can account for as high as 30–75% of the total NAD + regeneration under certain conditions, contributing significantly to the product formation.

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Biotechnology and Bioengineering

Tập 116 Số 7

1627-1643

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