Microbiological Quality of Fresh-Cut Carrots and Process Waters
Määttä, Jenni; Lehto, Marja; Kuisma, Risto; Kymäläinen, Hanna-Riitta; Mäki, Maarit (2013)
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Määttä, Jenni
Lehto, Marja
Kuisma, Risto
Kymäläinen, Hanna-Riitta
Mäki, Maarit
Julkaisusarja
Journal of Food Protection
Volyymi
76
Numero
7
Sivut
1240-1244
International Association For Food Protection
2013
Tiivistelmä
Fresh vegetables may be contaminated by pathogens in different ways after harvest. Pathogenic microorganisms associated
with fresh vegetables can cause severe outbreaks of foodborne disease. We discuss here the results of microbiological analysis of
carrot samples, as well as of washing, processing, and wastewater samples. Washed, unpeeled carrots generally contained the
highest aerobic plate counts (mean, 5.5 log CFU/g). Escherichia coli was not detected in any carrot or water sample examined.
The amounts of coliform bacteria and enterobacteria were higher in carrot samples taken from the first steps in the processing line
than in samples taken in later phases of the process. Yersinia pseudotuberculosis was not detected in any of the samples by the
cultivation method; however, nonpathogenic Yersinia enterocolitica was detected from most carrot samples and almost all
washing water and wastewater samples but only from 2 of 10 process water samples. Using a more-sensitive real-time PCR
method, pathogenic Y. enterocolitica was found from several carrot samples, and when these positive samples were cultivated, no
pathogenic Y. enterocolitica strains were detected.
with fresh vegetables can cause severe outbreaks of foodborne disease. We discuss here the results of microbiological analysis of
carrot samples, as well as of washing, processing, and wastewater samples. Washed, unpeeled carrots generally contained the
highest aerobic plate counts (mean, 5.5 log CFU/g). Escherichia coli was not detected in any carrot or water sample examined.
The amounts of coliform bacteria and enterobacteria were higher in carrot samples taken from the first steps in the processing line
than in samples taken in later phases of the process. Yersinia pseudotuberculosis was not detected in any of the samples by the
cultivation method; however, nonpathogenic Yersinia enterocolitica was detected from most carrot samples and almost all
washing water and wastewater samples but only from 2 of 10 process water samples. Using a more-sensitive real-time PCR
method, pathogenic Y. enterocolitica was found from several carrot samples, and when these positive samples were cultivated, no
pathogenic Y. enterocolitica strains were detected.
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