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2014 ; 2014
(ä): 608296
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A fast, reliable, and sensitive method for detection and quantification of
Listeria monocytogenes and Escherichia coli O157:H7 in ready-to-eat fresh-cut
products by MPN-qPCR
#MMPMID24949460
Russo P
; Botticella G
; Capozzi V
; Massa S
; Spano G
; Beneduce L
Biomed Res Int
2014[]; 2014
(ä): 608296
PMID24949460
show ga
In the present work we developed a MPN quantitative real-time PCR (MPN-qPCR)
method for a fast and reliable detection and quantification of Listeria
monocytogenes and Escherichia coli O157:H7 in minimally processed vegetables. In
order to validate the proposed technique, the results were compared with
conventional MPN followed by phenotypic and biochemical assays methods. When L.
monocytogenes and E. coli O157:H7 were artificially inoculated in fresh-cut
vegetables, a concentration as low as 1 CFU g(-1) could be detected in 48 hours
for both pathogens. qPCR alone allowed a limit of detection of 10(1) CFU g(-1)
after 2 hours of enrichment for L. monocytogenes and E. coli O157:H7. Since
minimally processed ready-to-eat vegetables are characterized by very short shelf
life, our method can potentially address the consistent reduction of time for
microbial analysis, allowing a better management of quality control. Moreover,
the occurrences of both pathogenic bacteria in mixed salad samples and fresh-cut
melons were monitored in two production plants from the receipt of the raw
materials to the early stages of shelf life. No sample was found to be
contaminated by L. monocytogenes. One sample of raw mixed salad was found
positive to an H7 enterohemorrhagic serotype.