Combination of a centrifugal microfluidic device with a solution-loading cartridge for fully automatic molecular...

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Diagnostics

Background:

• Foodborne pathogen detection is critical for public health and food safety.
• Current molecular diagnostic methods often involve complex, multi-step manual processes.
• There is a need for automated, integrated systems for rapid pathogen identification.

Purpose of the Study:

• To develop a fully automated centrifugal microfluidic device for molecular diagnostics of foodborne pathogens.
• To integrate a 3D-printed solution-loading cartridge for enhanced sample handling and automation.
• To demonstrate simultaneous detection of multiple pathogens with high sensitivity and speed.

Main Methods:

• Design and fabrication of a centrifugal microfluidic device.
• Incorporation of a 3D-printed cartridge for automated storage and sequential release of reagents.
• Integration of bead-based DNA extraction, loop-mediated isothermal amplification (LAMP), and colorimetric detection.
• Testing with four target foodborne pathogens: Escherichia coli O157:H7, Salmonella typhimurium, Vibrio parahaemolyticus, and Listeria monocytogenes.

Main Results:

• The device successfully performed automated DNA extraction, amplification, and detection.
• Simultaneous detection of 18 pathogens plus controls was possible in a single test.
• The assay demonstrated a limit of detection of 100 bacterial cells.
• The entire diagnostic process was completed within 65 minutes.

Conclusions:

• The centrifugal microfluidic device combined with a 3D-printed cartridge achieves true automation in molecular diagnostics.
• This integrated lab-on-a-chip system offers a promising solution for rapid and efficient foodborne pathogen detection.
• The technology has significant potential for point-of-care and field applications in food safety.