A novel real-time polymerase chain reaction-based method for the detection and quantification of lactose-fermenting Enterobacteriaceae in the dairy and other food industries |
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Authors: | M.C. Martí n,B. del Rio |
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Affiliation: | Instituto de Productos Lácteos de Asturias, CSIC, 33300 Villaviciosa, Asturias, Spain |
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Abstract: | The presence of lactose-fermenting Enterobacteriaceae and coliforms is routinely assessed to determine the hygienic quality of water and foods, particularly dairy products. This paper reports the use of lacZ-specific primers in an SYBR green I-based real-time PCR method for the easy and rapid detection of coliforms in dairy products. A large number of bacterial species were assayed to establish the specificity of the method. The sensitivity of the method was assessed using artificially contaminated cheeses. The limit of detection was 1 coliform cell in cheese samples enriched for 8 h in a culture medium. The entire procedure, including sample processing, enrichment, DNA extraction, and real-time PCR amplification, can be completed within 10 to 12 h, making it a single-day assay. |
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Keywords: | Enterobacteriaceae coliform real-time polymerase chain reaction detection cheese |
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