Enhancing xylose and glucose utilization as well as solvent production using a simplified three-electrode potentiostat system during Clostridium fermentation

Author:

Popovic Jovan1,Finneran Kevin T2

Affiliation:

1. Naval Facilities Engineering and Expeditionary Warfare Center Port Hueneme CA USA

2. grid.26090.3d 0000 0001 0665 0280 Department of Environmental Engineering and Earth Sciences Clemson University Clemson SC USA

Abstract

Abstract A simple potentiostat was constructed as a strategy to enhance solvent production in a mediatorless and oxygen-exposed fermentation inoculated with the aerotolerant strain Clostridium sp. C10. Elevated n-butanol and acetone titers were recorded in all fermentations with either glucose or xylose in the presence of electrodes poised at + 500 mV (+ 814 mV vs SHE) relative to cells plus substrate only controls. Respective butanol titers and volumetric butanol productivities in studies performed with 30 g/L glucose or 30 g/L xylose were 1.67 and 2.27 times and 1.90 and 6.13 times greater in the presence of electrodes compared to controls. Glucose and xylose utilization in the presence of electrodes was 61 and 125% greater than no-electrode controls, respectively. Increasing substrate concentrations to 60 g/L decreased the butanol yields relative to the studies performed at 30 g/L. These data suggest that it may be more efficient to alter reactor reduction potential than increase substrate concentration for solvent output during industrial fermentations, which favors higher yield with few additional inputs.

Publisher

Oxford University Press (OUP)

Subject

Applied Microbiology and Biotechnology,Biotechnology,Bioengineering

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Introduction to Special Issue on “Frontiers in Industrial Microbiology and Biotechnology 2020”;Journal of Industrial Microbiology and Biotechnology;2020-10-01

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