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Updated: Aug 31, 2026
Detection of Foodborne Bacterial Pathogens from Individual Filth Flies
Published on: February 13, 2015
[Co-enrichment and triple PCR detection of three foodborne pathogens]
1College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China.
Objective:
A triple PCR method was established for the detection of Salmonella enteritidis, Staphylococcus aureus and Vibrio parahaemolyticus.
Methods:
The three strains were mixed cultured in SSV enrichment medium for 16 h, specific primers were designed for Salmonellaenteritidis invA gene, Staphylococcus aureus nuc gene and Vibrio parahaemolyticus collagenase gene, respectively, and the triple PCR system was established. By optimizing the primer concentration, annealing temperature and cycle times of the triple PCR system, thus optimal triple PCR system was established. The system was evaluated from three aspects: specificity, repeatability and sensitivity.
Results:
The optimized result showed that, in the triple PCR system, the primers concentration of invA, nuc and collagenase were 10 nmol/L, 12.5 nmol/L and 12.5 nmol/L, respectively. The optimum annealing temperature was 55.6 ℃. The primers of the target bacteria had good specificity, and the detection sensitivity of the system was high. The sensitivity of the three strains in the triple PCR system was above 10~2 CFU/mL.
Conclusion:
The established triple PCR method has high specificity, high sensitivity and good repeatability, which provided a new technical support for the rapid detection of Salmonella enteritidis, Staphylococcus aureus and Vibrio parahaemolyticus.
Insights
A novel triple PCR method rapidly detects Salmonella enteritidis, Staphylococcus aureus, and Vibrio parahaemolyticus. This highly specific and sensitive technique offers improved food safety testing capabilities.
Area of Science:
- Microbiology
- Molecular Biology
- Food Safety
Background:
- Accurate detection of foodborne pathogens is crucial for public health.
- Existing methods may lack the speed or specificity required for comprehensive screening.
Purpose of the Study:
- To establish a multiplex PCR assay for simultaneous detection of three key foodborne pathogens.
- To optimize and validate the specificity, sensitivity, and repeatability of the triple PCR method.
Main Methods:
- Development of specific primers targeting invA, nuc, and collagenase genes.
- Optimization of primer concentrations, annealing temperature, and PCR cycling parameters.
- Evaluation of the assay's performance using mixed cultures and sensitivity testing.
Main Results:
- The optimized triple PCR assay demonstrated high specificity for Salmonella enteritidis, Staphylococcus aureus, and Vibrio parahaemolyticus.
- Sensitivity reached levels above 10^2 CFU/mL for all three target pathogens.
- The assay exhibited excellent repeatability and robustness.
Conclusions:
- The developed triple PCR method provides a reliable and efficient tool for the simultaneous detection of these three significant foodborne pathogens.
- This advancement offers enhanced technical support for rapid and accurate food safety monitoring.
