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http://dx.doi.org/10.5851/kosfa.2018.e11

Direct Detection of Escherichia coli, Staphylococcus aureus, and Salmonella spp. in Animal-derived Foods Using a Magnetic Bead-based Immunoassay  

Kim, Jong-Hui (National Institute of Animal Science, Rural Development Administration)
Yoo, Jae Gyu (National Institute of Animal Science, Rural Development Administration)
Ham, Jun-Sang (National Institute of Animal Science, Rural Development Administration)
Oh, Mi-Hwa (National Institute of Animal Science, Rural Development Administration)
Publication Information
Food Science of Animal Resources / v.38, no.4, 2018 , pp. 727-736 More about this Journal
Abstract
In this study, an immuno-magnetic bead (IMB)-based assay was developed to simultaneously detect Escherichia coli, Staphylococcus aureus, and Salmonella spp. and was tested in four animal-derived foods: beef, ham, egg, and ricotta cheese. The IMB-based assay exhibited good specificity by binding to five E. coli serotypes [capture efficiency (CE) average (avg.) 90.4%], five S. aureus strains (CE avg. 91.4%), and five Salmonella serotypes (CE avg. 95.4%) but not binding to non-target bacteria (CE<10%). Furthermore, the assay detected all three pathogens with a detection limit of 10 CFU/g without the need for enrichment or additional platforms. Since the results demonstrated that the IMB-based assay can effectively separate and enrich target bacteria from a variety of animal-derived food matrixes, the assay exhibits good specificity for potential use in providing rapid, immunological, presumptive identification of pathogenic bacteria.
Keywords
foodborne pathogen; Escherichia coli; Staphylococcus aureus; Salmonella spp.; immunomagnetic beads;
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