NDLI: Effect of the growth environment on the strain variability of Salmonella enterica kinetic behavior.

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Effect of the growth environment on the strain variability of Salmonella enterica kinetic behavior.

Year: 2011 Volume: 28 Issue: 3

Year: 2011 Volume: 28 Issue: 2

Year: 2011 Volume: 28 Issue: 1

Year: 2010 Volume: 27

Year: 2009 Volume: 26

Year: 2008 Volume: 25

Effect of the growth environment on the strain variability of Salmonella enterica kinetic behavior.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lianou, Alexandra Koutsoumanis, Konstantinos P.
Description	Country affiliation: Greece Author Affiliation: Lianou A ( Laboratory of Food Microbiology and Hygiene, Department of Food Science and Technology, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece.)
Abstract	Intra-species variability of microbial growth kinetic behavior is an event with important implications for food safety research. Aiming at the evaluation of the growth variability among Salmonella enterica strains as affected by the growth environment, the kinetic behavior of 60 isolates of the pathogen was assessed at 37 °C in tryptone soy broth of different pH values (4.3-7.0) and NaCl concentrations (0.5-6.0%). Maximum specific growth rate (µ(max)) values corresponding to each strain and growth condition were estimated by means of absorbance detection times of serially decimally diluted cultures using the automated turbidimetric system Bioscreen C. A total of 9600 optical density curves were generated for the strains and the growth conditions tested. The variability of µ(max) among the S. enterica strains was important and greater than that observed within the strains (i.e. among replicates). Moreover, strain variability increased as the growth conditions became more stressful both in terms of pH and NaCl. The coefficient of variation of µ(max) among the tested strains at pH 7.0-0.5% NaCl was 6.1%, while at pH 4.3-0.5% NaCl and pH 7.0-6.0% NaCl was 11.8% and 23.5%, respectively. Beyond the scientific interest in understanding strain variability, the findings of this study should be useful in strain selection for exploitation in food safety challenge studies as well as in incorporating strain variability in predictive microbiology and microbial risk assessment.
File Format	HTM / HTML
ISSN	07400020
Issue Number	4
Volume Number	28
e-ISSN	10959998
Journal	Food Microbiology
Language	English
Publisher	Elsevier
Publisher Date	2011-06-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Microbiology Discipline Nutritional Sciences Food Microbiology Methods Salmonella Enterica Growth & Development Animals Culture Media Pharmacology Humans Hydrogen-ion Concentration Kinetics Nephelometry And Turbidimetry Sodium Chloride Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Microbiology Food Science

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