Multi-Probe Nano-Genomic Biosensor to Detect S. aureus from Magnetically-Extracted Food Samples

Area of Science:

• Food Science
• Nanotechnology
• Molecular Biology

Background:

• Staphylococcal food poisoning is a major global health concern.
• Accurate and rapid detection of Staphylococcus aureus in food is crucial for public health.
• Existing detection methods can be time-consuming and costly.

Purpose of the Study:

• To develop a robust method for extracting Staphylococcus aureus from food samples.
• To design a cost-effective genomic biosensor for rapid S. aureus detection.
• To evaluate the specificity and sensitivity of the developed biosensor.

Main Methods:

• Utilized glycan-coated magnetic nanoparticles (MNPs) for bacterial extraction.
• Developed a multi-probe genomic biosensor incorporating gold nanoparticles and DNA oligonucleotide probes.
• Assessed biosensor performance using various food matrices and common foodborne pathogens for specificity and sensitivity testing.

Main Results:

• Successfully extracted Staphylococcus aureus using glycan-coated MNPs.
• The genomic biosensor demonstrated rapid detection of the S. aureus nuc gene.
• Achieved high specificity against Escherichia coli, Salmonella enterica serovar Enteritidis, and Bacillus cereus.
• Sensitivity tests indicated detection as low as 2.5 ng/µL of target DNA, with a linear range up to 20 ng/µL.

Conclusions:

• The developed method offers a robust approach for S. aureus extraction.
• The cost-effective genomic biosensor provides rapid and sensitive detection of S. aureus in food.
• This technology has the potential for widespread application in food safety surveillance.