Electrochemical Microwell Plate to Study Electroactive Microorganisms in Parallel and Real-Time

Abstract

Microbial resource mining of electroactive microorganism (EAM) is currently methodically hampered due to unavailable electrochemical screening tools. Here, we introduce an electrochemical microwell plate (ec-MP) composed of a 96 electrochemical deepwell plate and a recently developed 96-channel multipotentiostat. Using the ec-MP we investigated the electrochemical and metabolic properties of the EAM models Shewanella oneidensis and Geobacter sulfurreducens with acetate and lactate as electron donor combined with an individual genetic analysis of each well. Electrochemical cultivation of pure cultures achieved maximum current densities ( j max ) and coulombic efficiencies ( CE ) that were well in line with literature data. The co-cultivation of S. oneidensis and G. sulfurreducens led to an increased current density of j max of 88.57 ± 14.04 µA cm −2 (lactate) and j max of 99.36 ± 19.12 µA cm −2 (lactate and acetate). Further, a decreased time period of reaching j max and biphasic current production was revealed and the microbial electrochemical performance could be linked to the shift in the relative abundance.

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Identifiers

DOI

10.3389/fbioe.2021.821734

Journal

Frontiers in Bioengineering and Biotechnology

Year

2022