Document Detail

Influence of treatment time and pulse frequency on Salmonella Enteritidis, Escherichia coli and Listeria monocytogenes populations inoculated in melon and watermelon juices treated by pulsed electric fields.
MedLine Citation:
PMID:  17512997     Owner:  NLM     Status:  MEDLINE    
Consumption of unpasteurized melon and watermelon juices has caused several disease outbreaks by pathogenic microorganisms worldwide. Pulsed electric field (PEF) has been recognized as a technology that may inactivate those bacteria present in fluid food products at low temperatures. Hence, PEF treatment at 35 kV/cm, 4 mus pulse duration in bipolar mode and square shape were applied on Salmonella Enteritidis, E. coli and L. monocytogenes populations inoculated in melon and watermelon juices without exceeding 40 degrees C outlet temperatures. Different levels of treatment time and pulse frequency were applied to evaluate their effects on these microorganisms. Treatment time was more influential than pulse frequency (P</=0.05) on the PEF microbial reduction levels for both melon and watermelon juices. Populations of S. Enteritidis, E. coli and L. monocytogenes were experimentally reduced and validated in a single process up to 3.71+/-0.17, 3.7+/-0.3 and 3.56+/-0.26 log(10) units, respectively, in melon juice when 1440 micros and 217 Hz were used; whereas reductions up to 3.56+/-0.12, 3.6+/-0.4 and 3.41+/-0.13 log(10) units of those microorganisms, respectively, were reached in watermelon juice treated for 1727 micros at 188 Hz. Although PEF treatment reduced the populations of the three microorganisms, L. monocytogenes was more resistant to PEF than S. Enteritidis and E. coli in both juices when treated at the same processing conditions.
Jonathan Mosqueda-Melgar; Rosa M Raybaudi-Massilia; Olga Martín-Belloso
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-04-25
Journal Detail:
Title:  International journal of food microbiology     Volume:  117     ISSN:  0168-1605     ISO Abbreviation:  Int. J. Food Microbiol.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-05-29     Completed Date:  2007-09-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8412849     Medline TA:  Int J Food Microbiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  192-200     Citation Subset:  IM    
Department of Food Technology, University of Lleida, UTPV-CeRTA, Av. Alcalde Rovira Roure, 191, 25198 Lleida, Spain.
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MeSH Terms
Citrullus / microbiology
Colony Count, Microbial
Consumer Product Safety
Cucurbitaceae / microbiology*
Electric Stimulation / methods*
Escherichia coli / growth & development*
Food Contamination / prevention & control
Food Preservation / methods*
Listeria monocytogenes / growth & development*
Salmonella enteritidis / growth & development*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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