Journal
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
Volume 56, Issue 5, Pages 2576-2583Publisher
SPRINGER INDIA
DOI: 10.1007/s13197-019-03740-7
Keywords
Loop-mediated isothermal amplification; Lateral flow assay; Filtration; Escherichia coli O157:H7
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A1B03030859]
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Rapid detection of low number of pathogenic bacteria in food is difficult. This study tested the filter-based loop-mediated isothermal amplification-lateral flow immunoassay (LAMP-LFA) method for rapid detection of pathogens in real food. Escherichia coli O157:H7 was inoculated on 25g of beef and the homogenized sample was filtered with 0.45m cellulose nitrate filter, and concentrated E. coli was recovered and DNA was extracted and analyzed by LAMP. LFA reaction was performed by hybridization of digoxygenin-labeled LAMP amplicon and biotinylated probe. The sensitivity of the filtered sample was 100times more sensitive than that of the unfiltered sample. The total reaction time used for detection from sample preparation to confirmation of E. coli was within 3h. These results suggest that the LAMP-LFA method can be used in real food systems as point-of-care testing for E. coli O157:H7 in beef.
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