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Bacillus cereus, Bacillus thuringiensis and Bacillus mycoides differentiation using a PCR-RE technique
Marisa Manzano1, Luca Cocolin, Carlo Cantoni
1Dipartimento di Scienze degli Alimenti, Facoltà di Agraria, Università degli Studi di Udine, Italy. marisa.manzano@DSA.uniud.it
International Journal of Food Microbiology
|December 18, 2002
Summary
A new polymerase chain reaction combined with restriction endonuclease (PCR-RE) method effectively differentiates Bacillus cereus group bacteria. This technique accurately identifies these bacteria in pure cultures and potentially in food samples.
Area of Science:
- Microbiology
- Molecular Biology
- Food Safety
Background:
- Accurate identification of Bacillus cereus group bacteria is crucial for food safety.
- Existing methods for differentiating Bacillus cereus, Bacillus mycoides, and Bacillus thuringiensis can be time-consuming.
Purpose of the Study:
- To develop a rapid and reliable method for differentiating between Bacillus cereus, Bacillus mycoides, and Bacillus thuringiensis.
- To validate the method for identifying these bacteria in pure cultures and potentially in food samples.
Main Methods:
- Development of a polymerase chain reaction combined with restriction endonuclease (PCR-RE) technique.
- Utilized the gyrB DNA sequence for amplification.
- Tested specificity using strains from international collections and isolates from food samples.
- Employed RsaI, Sau3AI, and EcoRI endonucleases for restriction analysis.
Main Results:
- The PCR-RE method showed specific amplification for the B. cereus group.
- Staphylococcus aureus produced a similar PCR product but was clearly differentiated by restriction analysis.
- The method provided good differentiation for pure strains.
Conclusions:
- The developed PCR-RE technique is a fast, simple, and effective method for differentiating B. cereus group bacteria.
- The method holds promise for direct identification of the B. cereus group in food samples.