A Programmable and Printable Microbial Bioelectronic Sensor for Real-Time and Targeted Pollutant Monitoring in Water

Area of Science:

• Biotechnology
• Environmental Science
• Sensor Technology

Background:

• Routine water contaminant monitoring is slow and expensive.
• Existing microbial sensors lack specificity, stability, and speed.

Purpose of the Study:

• To develop a programmable and printable microbial bioelectronic sensor for rapid and specific detection of toxic trace contaminants.
• To overcome limitations of current microbial sensors through multi-scale chemical design.

Main Methods:

• Genetically reprogramming Shewanella oneidensis for specific pollutant recognition and bioelectrical detection.
• Encapsulating engineered microbes in a dual-network hydrogel for stability and biocompatibility.
• 3D-printing the biosensor into a fractal architecture to minimize mass transport resistance.

Main Results:

• Achieved a 5-minute response time, a 24-fold improvement over conventional methods.
• Demonstrated a low detection limit of 6.75 µg L⁻¹ and a broad dynamic range (20.4–700.0 µg L⁻¹).
• Maintained high accuracy (<4.2% relative error) in real wastewater samples.

Conclusions:

• Multiscale chemical design enables the development of advanced microbial bioelectronic sensors.
• This technology facilitates real-time, targeted monitoring of water pollutants.
• The programmable and printable sensor offers a promising solution for global water security.