A polymer microfluidic chip for quantitative detection of multiple water- and foodborne pathogens using real-time
Dieter M Tourlousse1, Farhan Ahmad, Robert D Stedtfeld
1Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA.
Biomedical Microdevices
|May 9, 2012
Summary
A new microfluidic chip enables rapid, low-cost detection of multiple food and waterborne pathogens using loop-mediated isothermal amplification (LAMP). This portable device offers quick, quantitative results for enhanced public health safety.
Area of Science:
- Biomedical Engineering
- Microfluidics
- Molecular Diagnostics
Background:
- Rapid detection of microbial pathogens is crucial for ensuring food and water safety.
- Existing methods can be costly, time-consuming, or require specialized laboratory equipment.
- There is a need for inexpensive, portable, and user-friendly devices for on-site pathogen screening.
Purpose of the Study:
- To develop a disposable polymer microfluidic chip for the quantitative detection of multiple microbial pathogens.
- To integrate features for robust sample loading and amplification using cost-effective manufacturing.
- To enable real-time monitoring of isothermal nucleic acid amplification for rapid pathogen identification.
Main Methods:
- Development of a multi-layered polymer microfluidic chip with 15 interconnected reaction wells.
- Integration of dehydrated primers for loop-mediated isothermal amplification (LAMP) and hydrophobic air vents/microvalves.
- Real-time fluorescence monitoring using SYTO-82 dye and a low-cost fluorescence imaging system.
- Testing with genomic DNA mixtures of Salmonella, Campylobacter jejuni, Shigella, and Vibrio cholerae.
Main Results:
- Successful quantitative detection of multiple virulence and marker genes from target pathogens.
- Achieved detection and quantification of 10-100 genomes per μl in under 20 minutes.
- Demonstrated the chip's effectiveness for rapid analysis of common food and waterborne bacteria.
Conclusions:
- The developed microfluidic chip provides a rapid, inexpensive, and portable solution for pathogen detection.
- The integrated system enables on-site screening of multiple pathogens, enhancing food and water safety.
- This technology has the potential to be a key tool for public health surveillance and diagnostics.
