Microbial fuel cell-based biosensor for fast analysis of biodegradable organic matter

Area of Science:

• Environmental Science
• Biotechnology
• Electrochemistry

Background:

• Microbial fuel cells (MFCs) offer potential for biosensing applications.
• Analyzing biodegradable organic matter requires sensitive and efficient methods.
• Previous biosensor designs faced limitations in long-term stability and reusability.

Purpose of the Study:

• To develop a novel biosensor for analyzing biodegradable organic matter.
• To utilize a single-chamber microbial fuel cell with a replaceable anaerobic consortium.
• To optimize the MFC-based sensor for maximum output and sensitivity.

Main Methods:

• A single-chamber microbial fuel cell (MFC) was designed with a proton exchange membrane separating anode and cathode compartments.
• A replaceable anaerobic consortium served as biocatalyst for organic matter oxidation and electron transfer.
• Optimization involved an 800 Omega resistor, 25 mM phosphate buffer with 50mM NaCl catholyte, and a 37°C anaerobic compartment temperature.

Main Results:

• The MFC biosensor demonstrated a linear response to glucose concentration up to 25 gl(-1).
• A low detection limit of 0.025 gl(-1) was achieved.
• Increased glucose loading resulted in a higher cell potential across the electrodes.

Conclusions:

• The developed MFC biosensor with a replaceable anaerobic consortium is effective for on-line monitoring of organic matter.
• The sensor's design allows for biocatalyst renewal, enhancing its practicality.
• This approach presents a promising tool for environmental monitoring and wastewater treatment analysis.