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MPN-PCR-quantification method for staphylococcal enterotoxin c1 gene from fresh cheese
V Mäntynen1, S Niemelä, S Kaijalainen
1Department of Applied Chemistry and Microbiology, University of Helsinki BIOCENTER, Finland. Vesa.Mantynen@Helsinki.Fi
International Journal of Food Microbiology
|May 20, 1997
Summary
A new Most Probable Number PCR (MPN-PCR) assay offers a rapid and sensitive method for detecting and quantifying Staphylococcus aureus in food. This technique significantly reduces analysis time compared to traditional methods.
Area of Science:
- Microbiology
- Food Safety
- Molecular Diagnostics
Background:
- Polymerase Chain Reaction (PCR) is widely used in diagnostic microbiology.
- Quantification of PCR products is challenging, limiting routine application in food labs.
- Traditional methods like plate counting are time-consuming.
Purpose of the Study:
- To develop a simple, sensitive, and reliable method for quantifying PCR products.
- To detect and enumerate enterotoxin C producing Staphylococcus aureus in fresh cheese.
Main Methods:
- Developed a Most Probable Number PCR (MPN-PCR) assay.
- Utilized a single-copy chromosomal enterotoxin C gene fragment for amplification.
- Applied Moran's test to validate mathematical assumptions of MPN statistics.
Main Results:
- The MPN-PCR assay detected as low as 20 colony-forming units (cfu)/g.
- DNA dilution series met the mathematical assumptions for MPN methods.
- Analysis time was reduced to one day, compared to three days for plate counting.
Conclusions:
- The developed MPN-PCR assay is a sensitive and rapid tool for foodborne pathogen detection.
- This method simplifies quantification of PCR products for routine laboratory use.
- The MPN-PCR approach is adaptable to various primer systems.