Journal
JOURNAL OF DAIRY SCIENCE
Volume 98, Issue 3, Pages 1563-1570Publisher
ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2014-8828
Keywords
Staphylococcus aureus; silica-coated magnetic nanoparticles; thermophilic helicase-dependent isothermal amplification; SYBR Green I
Funding
- Twelfth Five-Year Plan for the National Science and Technology Support Porgram [2011BAK10B06, 2011BAK10B01, 2011BAK10B02]
- Natural Science Foundation [31260363, 31000048]
- Ganpo Talent Engineering 555 Project [18000035]
- Academic and Technical Leaders Training Program for Major Subjects of Jiangxi Province [2009-12]
- Research Program of the State Key Laboratory of Food Science and Technology of Nanchang University [SKLF-ZZA-201302, SKLF-TS-200916]
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Staphylococcus aureus is one of the main pathogens in dairy and meat products; therefore, developing a highly sensitive and rapid method for its detection is necessary. In this study, a quantitative detection method for Staph. aureus was developed using silica-coated magnetic nanoparticles and thermophilic helicase-dependent isothermal amplification. First, genomic DNA was extracted from lysed bacteria using silica-coated magnetic nanoparticles and amplified using thermophilic helicase-dependent isothermal amplification. After adding the nucleic-acid dye SYBR Green I to the amplicons, the fluorescence intensity was observed using a UV lamp or recorded using a fluorescence spectrophotometer. This detection system had a detection limit of 5 x 10(0) cfu/mL in pure culture and milk-powder samples and 5 x 10(1) cfu/mL in pork samples using a UV light in less than 2 h. In addition, a good linear relationship was obtained between fluorescence intensity and bacterial concentrations ranging from 10(2) to 10(4) cfu/mL under optimal conditions. Furthermore, the results from contaminated milk powder and pork samples suggested that the detection system could be used for the quantitative analysis of Staph. aureus and applied potentially to the food industry for the detection of this pathogen.
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