Document Detail


Modeling the growth rate and lag time of different strains of Salmonella enterica and Listeria monocytogenes in ready-to-eat lettuce.
MedLine Citation:
PMID:  22265311     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The growth parameters (growth rate, μ and lag time, λ) of three different strains each of Salmonella enterica and Listeria monocytogenes in minimally processed lettuce (MPL) and their changes as a function of temperature were modeled. MPL were packed under modified atmosphere (5% O₂, 15% CO₂ and 80% N₂), stored at 7-30 °C and samples collected at different time intervals were enumerated for S. enterica and L. monocytogenes. Growth curves and equations describing the relationship between μ and λ as a function of temperature were constructed using the DMFit Excel add-in and through linear regression, respectively. The predicted growth parameters for the pathogens observed in this study were compared to ComBase, Pathogen modeling program (PMP) and data from the literature. High R² values (0.97 and 0.93) were observed for average growth curves of different strains of pathogens grown on MPL. Secondary models of μ and λ for both pathogens followed a linear trend with high R² values (>0.90). Root mean square error (RMSE) showed that the models obtained are accurate and suitable for modeling the growth of S. enterica and L. monocytogenes in MP lettuce. The current study provides growth models for these foodborne pathogens that can be used in microbial risk assessment.
Authors:
Anderson S Sant'Ana; Bernadette D G M Franco; Donald W Schaffner
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-11-15
Journal Detail:
Title:  Food microbiology     Volume:  30     ISSN:  1095-9998     ISO Abbreviation:  Food Microbiol.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-01-23     Completed Date:  2012-05-10     Revised Date:  2013-05-24    
Medline Journal Info:
Nlm Unique ID:  8601127     Medline TA:  Food Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  267-73     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil. assantana@usp.br
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MeSH Terms
Descriptor/Qualifier:
Colony Count, Microbial
Consumer Product Safety
Fast Foods / microbiology*
Food Contamination / analysis*
Food Microbiology*
Food Packaging / methods
Food Storage / methods
Lettuce / microbiology*
Linear Models
Listeria monocytogenes / growth & development,  isolation & purification*
Models, Biological
Salmonella enterica / growth & development,  isolation & purification*
Temperature
Time Factors
Comments/Corrections
Erratum In:
Food Microbiol. 2013 Jun;34(2):436

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


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