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Microbiological quality of fresh fruit and vegetable products in Catalonia (Spain) using normalised plate‐counting methods and real time polymerase chain reaction (QPCR)
Author(s) -
Badosa Esther,
Trias Rosalia,
Parés Dolors,
Pla Maria,
Montesinos Emilio
Publication year - 2008
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.3124
Subject(s) - salmonella , listeria monocytogenes , food science , listeria , biology , contamination , polymerase chain reaction , plate count , most probable number , food contaminant , food microbiology , bacteria , veterinary medicine , medicine , ecology , biochemistry , genetics , gene
BACKGROUND: Commercially available fruits and raw and ready‐to‐eat vegetables ( n = 445) were examined for aerobic, coliform, and yeast and mould counts using normalised methods. Listeria spp., Listeria monocytogenes and Salmonella spp. were detected by real time polymerase chain reaction (QPCR) after enrichment. RESULTS: Aerobic plate counts ranged from < 10 to > 10 9 colony‐forming units (CFU) g −1 , with the lowest and highest counts recorded for fruits and sprouts respectively. The highest incidence level of coliforms was found in ready‐to‐eat vegetables, with up to 65.7% of samples containing from 5 to 9 log 10 CFU g −1 . Yeasts and moulds showed their highest incidence level between 5 and 6 log 10 CFU g −1 , with an overall range from < 2 to 9 log 10 CFU g −1 . Salmonella spp., Listeria spp. and L. monocytogenes were detected in 0.67, 2.7 and 0.9% respectively of the total samples examined. CONCLUSION: The samples analysed can be gathered into two main groups, one showing low microbial counts (fruits) and a second group (raw whole leaves and roots and packed ready‐to‐eat vegetables) with higher microbial contamination. Although incidence levels of pathogenic bacteria reported here are in the lower range of those reported elsewhere, positive detections highlight the importance of good hygienic measures throughout the whole food chain. Copyright © 2007 Society of Chemical Industry