Recent advances in electro-fermentation technology: A novel approach towards balanced fermentation

Area of Science:

• Biotechnology
• Industrial Microbiology
• Green Chemistry

Background:

• Acidogenic fermentation (AF) converts organic substrates into valuable platform chemicals but is limited by low product titers due to thermodynamic constraints.
• Augmenting the redox potential in AF can optimize metabolic pathways and electron flow, enhancing substrate utilization and product yield.

Purpose of the Study:

• To critically review the current understanding of electro-fermentation (EF), an augmented AF system utilizing exogenous electricity.
• To focus on the extracellular electron transfer mechanisms of electroactive bacteria in EF.
• To identify perspectives and research gaps for advancing EF technology.

Main Methods:

• Systematic review of existing literature on electro-fermentation (EF) and acidogenic fermentation (AF).
• Analysis of extracellular electron transfer mechanisms in electroactive bacteria.
• Discussion of EF's potential in green chemical synthesis and waste management.

Main Results:

• EF, by supplying exogenous electricity, overcomes thermodynamic limitations in AF, leading to improved product titers and yields.
• Electroactive bacteria play a key role in EF through extracellular electron transfer, regulating metabolic pathways.
• EF demonstrates significant potential for enhancing substrate utilization and product speciation.

Conclusions:

• Electro-fermentation (EF) presents a powerful advancement over traditional AF, offering a more efficient and sustainable method for producing valuable chemicals.
• Further research into EF mechanisms and optimization is crucial for its widespread application in green synthesis and the circular bio-economy.