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http://dx.doi.org/10.5851/kosfa.2013.33.5.610

Comparison of Polymerase Chain Reaction, Real-time Polymerase Chain Reaction, and Loop-Mediated Isothermal Amplification for the Detection of Cronobacter sakazakii in Milk Powder  

Kim, Young-Joo (Department of Nutrition Education, Chung-Ang University)
Seo, Sheungwoo (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Wang, Xiaoyu (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Seo, Dong Joo (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Lee, Min Hwa (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Son, Na Ry (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Lee, Bog-Hieu (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Choi, Changsun (School of Food Science and Technology, Department of Food and Nutrition, Chung-Ang University)
Publication Information
Food Science of Animal Resources / v.33, no.5, 2013 , pp. 610-616 More about this Journal
Abstract
Loop-mediated isothermal amplification (LAMP) is an emerging detection technology for the amplification of DNA under isothermal conditions. The aim of this study was to develop a rapid and reliable LAMP technique for the detection of Cronobacter sakazakii in milk powder. In order to enhance the sensitivity and specificity, LAMP primers targeting outer membrane protein A (ompA) gene of C. sakazakii were designed using Explorer V4 software. Thirty seven C. sakazakii strains and 13 pathogenic microorganisms were used for comparative detection of C. sakazakii using polymerase chain reaction (PCR), real-time PCR, and LAMP. LAMP developed in this study could specifically detect C. sakazakii strains without cross-reactivity with other foodborne pathogens. LAMP products amplified from ompA gene of C. sakazakii were digested with with HhaI and NruI enzyme. The specificity of LAMP was confirmed by restriction fragment length polymorphism (RFLP) analysis. LAMP could detect C. sakazakii within 1 h without bacterial culture and its detection limit was as low as 1 CFU/mL C. sakazakii in milk. In the comparison of the sensitivity, LAMP showed 10,000- and 100-times higher detection limit than PCR or real-time PCR, respectively. Therefore, this study can conclude that LAMP is a rapid and reliable detection technique for C. sakazakii contaminated in powdered milk.
Keywords
loop-mediated isothermal amplification (LAMP); Cronobacter sakazakii; ompA; specificity; sensitivity;
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