Phage-Loaded Microfluidic Device for Selective Bacterium Detection with a High Potential for in-the-Field...

Area of Science:

• Biotechnology
• Biosensor Technology
• Food Safety Science

Background:

• Foodborne bacterial pathogens pose significant global public health risks.
• Conventional detection methods (e.g., PCR, ELISA) are sensitive but slow and labor-intensive.
• There is a critical need for rapid, point-of-use bacterial detection techniques.

Purpose of the Study:

• To develop a microfluidic biosensor for rapid and selective detection of Salmonella enterica.
• To leverage bacteriophage-loaded surfaces for enhanced bacterial capture and detection.
• To address limitations of conventional methods in food and water safety analysis.

Main Methods:

• Fabrication of a microfluidic biosensor using polydimethylsiloxane (PDMS) with microscale topographical roughness.
• Immobilization of P22 bacteriophages onto the PDMS surface to capture Salmonella enterica.
• Detection of bacteria under continuous flow conditions without requiring incubation.

Main Results:

• Achieved a limit of detection of 9.15 × 10^3 cells/mL for Salmonella enterica.
• Demonstrated high specificity, successfully differentiating Salmonella enterica from Staphylococcus aureus.
• Validated rapid detection capabilities under continuous flow, eliminating incubation time.

Conclusions:

• The developed microfluidic biosensor provides a rapid and selective method for detecting Salmonella enterica.
• The platform shows high potential for in-field applications and resource-limited settings.
• This technology offers a promising solution for real-world food and water safety monitoring.