Document Detail


Impacts of treatment parameters on the inactivation of Campylobacter jejuni by high pressure: a statistical study of main effects and interactions.
MedLine Citation:
PMID:  19141038     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIM: The influence of environmental (temperature and pH) and biological (strain) parameters on the inactivation of Campylobacter jejuni by high hydrostatic pressure (HHP) was investigated. METHODS AND RESULTS: Two clinical strains harvested in stationary phase were pressurized at 20 degrees C and 37 degrees C within a range of 50-400 MPa, in a phosphate (pH 7.0) or a citrate phosphate buffer (pH 5.6), for 10 min. Treatment efficiencies were determined by logarithmic comparisons of culturable cells on blood agar before and after treatment. Results were statistically compared using an anova of culturable cells after treatment to evaluate the effect of all factors. At least a 7-log reduction in cell numbers was observed for both strains. The pH and the strains had no effect on HHP treatment at 20 degrees C while at 37 degrees C, both pH and strain influenced significantly the HHP treatment on C. jejuni. CONCLUSIONS: The pressure efficacy on C. jejuni eradication was affected by both environmental and biological factors. SIGNIFICANCE AND IMPACT OF THE STUDY: Depending on the treatment conditions, C. jejuni sensitivity to HHP can significantly vary. The determination of the inactivation treatment by HPP has to be normalized considering the interaction of environmental and biological factors.
Authors:
C Bièche; M Ritz; O Tresse; M Federighi; M de Lamballerie
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Publication Detail:
Type:  Journal Article     Date:  2008-01-03
Journal Detail:
Title:  Letters in applied microbiology     Volume:  48     ISSN:  1472-765X     ISO Abbreviation:  Lett. Appl. Microbiol.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-02-06     Completed Date:  2009-02-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8510094     Medline TA:  Lett Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  198-202     Citation Subset:  IM    
Affiliation:
UMR-INRA SECALIM ENVN/ENITIAA, Ecole Nationale Vétérinaire de Nantes, France.
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MeSH Terms
Descriptor/Qualifier:
Campylobacter Infections / microbiology
Campylobacter jejuni / growth & development*
Disinfection / methods,  statistics & numerical data*
Humans
Hydrogen-Ion Concentration
Hydrostatic Pressure
Microbial Viability*
Temperature

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


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