Document Detail

Bacterial dynamics in model cheese systems, aiming at safety and quality of Portuguese-style traditional ewe's cheeses.
MedLine Citation:
PMID:  19903385     Owner:  NLM     Status:  MEDLINE    
An experiment using model ewe's milk cheeses was designed to characterize microbial interactions that arise in actual raw milk cheese environments. These model cheeses were manufactured according to Portuguese artisanal practices, except that the microbial load and biodiversity were fully controlled: single potential pathogens and spoilage bacteria, or a combination thereof, were combined at various initial inoculum levels in sterilized raw ewe's milk with several lactic acid bacteria (LAB) normally found in traditional cheeses. Viable microbial counts were monitored throughout a 60-day ripening period. Two alternative mathematical approaches were used to fit the experimental data generated in terms of population dynamics: percent of inhibition and D-values. These were able to explain the complex competitive interactions between the contaminant microorganisms and the LAB adventitious populations. In general, the tested LAB were less able to inhibit contaminants present in combination and in higher concentrations. Lactococcus lactis, with its strong acidifying potential, was the most effective factor in controlling the unwanted bacterial population, especially single Staphylococcus aureus. The two lactobacilli studied, especially Lactobacillus brevis, were shown to be less effective; Escherichia coli and Listeria innocua were the contaminants least inhibited by the LAB.
Cl??udia I Pereira; Jo??o A Gra??a; Natacha S Ogando; Ana M P Gomes; F Xavier Malcata
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  72     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-11-11     Completed Date:  2010-01-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2243-51     Citation Subset:  IM    
CBQF/Escola Superior de Biotecnologia, Universidade Cat??lica Portuguesa, P-4200-072 Porto, Portugal.
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MeSH Terms
Cheese / microbiology*,  standards
Colony Count, Microbial
Consumer Product Safety*
Escherichia coli / growth & development
Food Microbiology
Lactobacillaceae / physiology*
Listeria / growth & development
Population Dynamics
Staphylococcus aureus / growth & development

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

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