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Updated: Apr 13, 2026
Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
Published on: October 23, 2011
Sensitive detection of multiplex bacteria based on finger driven microfluidics and recombinase aided amplification
Nana Jin1, Fengzhen Yang2, Xinyang Zhang1
1Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China; Xianghu Laboratory, Hangzhou, 311231, China.
A novel microfluidic chip combined with recombinase aided amplification offers rapid, sensitive detection of foodborne pathogens like Salmonella, E. coli, and Listeria. This technology enhances food safety through simple, in-field screening capabilities.
Area of Science:
- Biotechnology
- Microfluidics
- Food Safety
Background:
- Traditional bacterial detection methods are time-consuming, lack sensitivity, and are operationally complex.
- Foodborne pathogens such as Salmonella Typhimurium, E. coli O157:H7, and Listeria monocytogenes pose significant public health risks.
Purpose of the Study:
- To develop a versatile, finger-driven microfluidic chip for fast, sensitive, and simple multiplex bacterial detection.
- To integrate the microfluidic chip with recombinase aided amplification (RAA) for enhanced pathogen detection.
Main Methods:
- Designed a microfluidic chip with pneumatic check valves and a 3D-printed rotating valve for precise solution control.
- Integrated a portable fluorescence detection device with an LED light source for bacterial quantification.
- Utilized recombinase aided amplification (RAA) for rapid amplification of target bacterial DNA.
Main Results:
- Achieved detection limits as low as 15 CFU/mL for Salmonella Typhimurium, 48 CFU/mL for E. coli O157:H7, and 38 CFU/mL for Listeria monocytogenes.
- Completed multiplex bacterial detection within 45 minutes under optimal conditions.
- Demonstrated simple operation, high sensitivity, and short detection times.
Conclusions:
- The developed microfluidic chip coupled with RAA is a promising tool for in-field screening of foodborne pathogens.
- This technology has significant potential to enhance overall food safety and public health protection.
- The system offers a user-friendly and efficient alternative to conventional bacterial detection methods.
