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This MEC study investigates BOD sensor, Biocathode, Electrotrophs. Key performance metrics include current density.

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Abstract

Electrotrophic biocathodes enable rapid biochemical oxygen demand (BOD) sensing but face challenges like slow colonization, low current, and poorly understood microbial interactions. This study employed exogenous quorum sensing signals (C6-HSL and 3O-C12-HSL) to enhance biofilm development on oxygen-reducing biocathodes. These two N-acyl-homoserine lactones (AHLs) accelerated formation and boosted current density 5-6 times. Candidatus Tenderia served as key electrotrophs, while non-electroactive Moheibacter promoted early adhesion and extracellular polymeric substance (EPS) production. Metagenomics showed upregulation of genes related to iron metabolism, adhesion, and electron transfer, alongside increased fulvic-like shuttle secretion. A cascade model was proposed: AHLs initiate non-electrotrophic EPS production, facilitating electrotrophs colonization and electron transfer. AHL-enhanced biofilm showed improved BOD sensing sensitivity and linearity, providing a new strategy and mechanistic basis for developing efficient biocathode biosensors.

Keywords

BiofilmQuorum sensingExtracellular polymeric substanceExtracellularElectron acceptorBacteria

Identifiers

DOI
10.1016/j.biortech.2025.133363
PubMed
40983296
Journal
Bioresource technology
Year
2025