eng Science and Education Publishing Journal of Food and Nutrition Research 2333-1240 2014-07-09 2 7 363 368 10.12691/jfnr-2-7-6 JFNR2014276 article Huiling Di 1 Lei Shi 1 Huiping Shen 1 He Yan 1 Hecheng Meng 1 Lili Li 1 M. Jahangir Alam 2 Shinji Yamasaki 3 Lei Ye jiema17@yeah.net 3 College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, PR China University of Houston College of Pharmacy Houston, TX, USA Graduate Schools of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan A real-time turbidimeter loop-mediated isothermal amplification (LAMP) assay was developed for the rapid, sensitive, and convenient detection of genetically modified (GM) ingredients in soybean products obtained from local supermarkets in China. Specific primers were designed based on the published sequence of lectin, nos terminator and endogenous genes of two GM soybean strains (GTS40-3-2 and MON89788). The total genomic DNA of soybean-made products was extracted by cetyltrimethylammonium bromide (CTAB) method. Then, the genomic DNA was used as template for LAMP assay. The results showed that this real-time turbidimeter LAMP assay was specific and sensitive enough to amplify DNA from soybean products. The limit of detection (LOD) of lectin and MON89788 was 0.01% (weight of GM soybean/weight of non-GM soybean), roughly equivalent to four copies of soybean genomic DNA in DNA mixture within one hour; and the LOD of nos and GTS40-3-2 was 0.1%, roughly equivalent to forty copies of soybean genomic DNA within 1 hour. The sensitivity reaches to 0.01%, which meets the requirements of the European Union (EU). In practical application, the total detectable ratio in soybean-made products was the same as that of PCR, suggesting that LAMP method was accurate and sensitive. http://pubs.sciepub.com/jfnr/2/7/6/jfnr-2-7-6.pdf real-time turbidimeter-LAMP GM soybean rapid detection