Rapid Detection of Salmonella enterica in Food Using a Compact Disc-Shaped Device

Area of Science:

• Food Safety
• Microbiology
• Biotechnology

Background:

• Rapid detection of foodborne pathogens is critical for public health and the food industry.
• Conventional culture methods are sensitive but slow (days), while polymerase chain reaction (PCR) is faster (hours) but more expensive and less sensitive.
• Existing methods present limitations in speed, cost, and sensitivity for effective foodborne pathogen surveillance.

Purpose of the Study:

• To develop a rapid, sensitive, and cost-effective method for detecting foodborne pathogens, specifically *Salmonella enterica*.
• To utilize a compact disc (CD)-shaped device to reduce reagent consumption in PCR-based detection.
• To optimize sample preparation for efficient bacterial cell collection from food matrices.

Main Methods:

• Developed a novel detection method combining bacterial culture with PCR on a CD-shaped device.
• Investigated a sample preparation technique for collecting bacterial cells from spiked chicken meat.
• Performed PCR on collected bacterial cells after an optimized cultivation period.

Main Results:

• The combined culture and PCR method on the CD device demonstrated faster detection than conventional culture methods.
• Achieved sensitive detection of *S. enterica* at low concentrations (1.7 × 10⁴ CFUs·g⁻¹) within 8 hours, including sample preparation and detection time.
• Successfully detected down to 30 CFUs·g⁻¹ of *S. enterica* within 12 hours, incorporating an 8-hour cultivation step.

Conclusions:

• The developed CD-based, culture-PCR integrated method offers a rapid, sensitive, and cost-effective alternative for foodborne pathogen detection.
• This approach significantly improves upon the limitations of traditional culture and standard PCR methods.
• The optimized sample preparation and detection protocol holds promise for enhanced food safety monitoring.