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Related Experiment Video

Updated: Mar 15, 2026

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
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New method for characterizing electron mediators in microbial systems using a thin-layer twin-working electrode cell.

Md Mahamudul Hassan1, Ka Yu Cheng2, Goen Ho3

  • 1School of Engineering and Information Technology, Murdoch University, WA 6150, Australia; Department of Microbiology, University of Chittagong, Chittagong 4331, Bangladesh.

Biosensors & Bioelectronics
|September 9, 2016
PubMed
Summary

This study introduces a novel twin working electrode system to simulate redox gradients in microbial biofilms. The method accurately detects and quantifies electron mediators, crucial for understanding microbial electron transfer.

Keywords:
Electron mediatorMid-point potentialPseudomonas aeruginosaRedox gradientRiboflavinTwin working electrode

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Area of Science:

  • Electrochemistry
  • Microbiology
  • Environmental Science

Background:

  • Microbial biofilms create redox gradients essential for electron transfer.
  • Soluble electron mediators play a key role in these processes.
  • Simulating these gradients is vital for studying biofilm function.

Purpose of the Study:

  • To develop and validate a method for simulating redox gradients.
  • To detect and quantify electron mediators within these simulated gradients.
  • To analyze mediator-dependent microbial electron transfer.

Main Methods:

  • Utilized two interfacing working electrodes (WEs) with independently controlled potentials.
  • Established a
  • voltage window
  • to enable simultaneous oxidation and reduction of mediators.
  • Characterized electrochemical properties of mediators (hexacyanoferrate, riboflavin) and those from *Pseudomonas aeruginosa*.

Main Results:

  • Demonstrated simultaneous anodic and cathodic currents, indicating mediator oxidation and reduction.
  • Successfully identified and quantified individual mediators and mixtures.
  • Precisely determined mid-potentials of added and biologically produced mediators.

Conclusions:

  • The twin working electrode system effectively simulates biofilm redox gradients.
  • This technique enables accurate detection and quantification of electron mediators.
  • It is highly suitable for studying mediator-dependent microbial electron transfer.