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Applied and Environmental Microbiology, July 2001, p. 3122-3126, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3122-3126.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Comparison of Different Approaches To Quantify Staphylococcus aureus Cells by Real-Time Quantitative PCR and Application of This Technique for Examination of Cheese

Ingeborg Hein,1,* Angelika Lehner,1 Petra Rieck,1 Kurt Klein,2 Ernst Brandl,1 and Martin Wagner1

Institute of Milk Hygiene, Milk Technology, and Food Science, University of Veterinary Medicine,1 and Roche Diagnostics GmbH,2 1210 Vienna, Austria

Received 11 December 2000/Accepted 20 April 2001

Two different real-time quantitative PCR (RTQ-PCR) approaches were applied for PCR-based quantification of Staphylococcus aureus cells by targeting the thermonuclease (nuc) gene. Purified DNA extracts from pure cultures of S. aureus were quantified in a LightCycler system using SYBR Green I. Quantification proved to be less sensitive (60 nuc gene copies/µl) than using a fluorigenic TaqMan probe (6 nuc gene copies/µl). Comparison of the LightCycler system and the well-established ABI Prism 7700 SDS with TaqMan probes revealed no statistically significant differences with respect to sensitivity and reproducibility. Application of the RTQ-PCR assay to quantify S. aureus cells in artificially contaminated cheeses of different types achieved sensitivities from 1.5 × 102 to 6.4 × 102 copies of the nuc gene/2 g, depending on the cheese matrix. The coefficients of correlation between log CFU and nuc gene copy numbers ranged from 0.979 to 0.998, thus enabling calculation of the number of CFU of S. aureus in cheese by performing RTQ-PCR.

* Corresponding author. Mailing address: Institute of Milk Hygiene, Milk Technology and Food Science, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria. Phone: 431250773511. Fax: 431250773590. E-mail: Ingeborg.Hein{at}vu-wien.ac.at.

Applied and Environmental Microbiology, July 2001, p. 3122-3126, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3122-3126.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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