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• W1996465576 abstract "ABSTRACT Recent outbreaks linked to Salmonella -contaminated produce heightened the need to develop simple, rapid, and accurate detection methods, particularly those capable of determining cell viability. In this study, we examined a novel strategy for the rapid detection and quantification of viable salmonellae in produce by coupling a simple propidium monoazide sample treatment with loop-mediated isothermal amplification (PMA-LAMP). We first designed and optimized a LAMP assay targeting Salmonella . Second, the performance of PMA-LAMP for detecting and quantifying viable salmonellae was determined. Finally, the assay was evaluated in experimentally contaminated produce items (cantaloupe, spinach, and tomato). Under the optimized condition, PMA-LAMP consistently gave negative results for heat-killed Salmonella cells with concentrations up to 10 8 CFU/ml (or CFU/g in produce). The detection limits of PMA-LAMP were 3.4 to 34 viable Salmonella cells in pure culture and 6.1 × 10 3 to 6.1 × 10 4 CFU/g in spiked produce samples. In comparison, PMA-PCR was up to 100-fold less sensitive. The correlation between LAMP time threshold ( T T ) values and viable Salmonella cell numbers was high ( R 2 = 0.949 to 0.993), with a quantification range (10 2 to 10 5 CFU/reaction in pure culture and 10 4 to 10 7 CFU/g in produce) comparable to that of PMA in combination with quantitative real-time PCR (PMA-qPCR). The complete PMA-LAMP assay took about 3 h to complete when testing produce samples. In conclusion, this rapid, accurate, and simple method to detect and quantify viable Salmonella cells in produce may present a useful tool for the produce industry to better control potential microbial hazards in produce." @default.
• W1996465576 created "2016-06-24" @default.
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• W1996465576 date "2011-06-15" @default.
• W1996465576 modified "2023-10-17" @default.
• W1996465576 title "Rapid Detection of Viable Salmonellae in Produce by Coupling Propidium Monoazide with Loop-Mediated Isothermal Amplification" @default.
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• W1996465576 doi "https://doi.org/10.1128/aem.00354-11" @default.
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