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• W2030484814 abstract "Commercially available alfalfa seeds were inoculated with low levels (∼ 4 CFU/g) of pathogenic bacteria and sprouted at 25C. At 48 h, the spent irrigation water and sprouts were separately transferred to brain heart infusion (BHI) broth and enriched for 4 h at 37C and 160 rpm. Specific immunomagnetic beads (IMB) were then applied to capture the E. coli O157 or Salmonella in the enriched media. Separation and concentration of captured pathogens were achieved using magnetic particle concentrators (MPC). IMB captured E. coli O157:H7 and Salmonella spp. then formed sandwiched complexes with europium (Eu) labeled anti-E. coli O157 antibodies and samarium (Sm) labeled anti-Salmonella antibodies, respectively. After washing the complexes, the lanthanide labels were extracted out from the complexes by specific chelators to form strongly fluorescent Eu- and Sm-chelates. The specific time-resolved fluorescence (TRF) associated with Eu or Sm was measured to estimate the extent of capture of the E. coli O157 and Salmonella, respectively. The results indicated that the approach could detect E. coli O157 and many Salmonella spp. from spent irrigation water or sprouts grown from contaminated seeds. Nontargeted bacteria, e.g., native microflora present on the untreated seeds and inoculated Aeromonas and Citrobacter, exhibited no crossreactivity and counts were not significantly different from background fluorescence of the IMB alone. Since pathogen detection was achieved within 6 h, the assay could detect contamination levels as low as 4 CFU/g of seeds and it showed no cross-reactivity with nonpathogenic microflora present on the sprouts, the developed methodology could be used as a rapid, sensitive and specific screening process for E. coli O157 and Salmonella spp. in sprouts and their irrigation water." @default.
• W2030484814 created "2016-06-24" @default.
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• W2030484814 date "2003-07-01" @default.
• W2030484814 modified "2023-10-12" @default.
• W2030484814 title "RAPID DETECTION OF OUTBREAK ESCHERICHIA COLI O157 AND SALMONELLA ON ALFALFA SPROUTS BY IMMUNOMAGNETIC CAPTURE AND TIME-RESOLVED FLUORESCENCE" @default.
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• W2030484814 doi "https://doi.org/10.1111/j.1745-4565.2003.tb00353.x" @default.
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