| Staphylococcus aureus growth and enterotoxin production during the manufacture of uncooked, semihard cheese from cows' raw milk. | |
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MedLine Citation:
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PMID: 16995519 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Staphylococcus aureus growth and enterotoxin production during the manufacture of model Saint-Nectaire, Registered Designation of Origin Saint-Nectaire, and Registered Designation of Origin Salers cheeses, three types of uncooked, semihard, raw milk cheese, were investigated. Coagulase-positive staphylococci (SC+) grew rapidly during the first 6 h. Between 6 and 24 h, counts increased by less than 0.5 log CFU/ml. Raw milk counts ranged from undetectable (<10 CFU/ml) to 3.03 log CFU/ml. Maximal levels reached in cheese on day 1 ranged from 2.82 to 6.84 log CFU/g. The level of SC+ after 24 h was mainly influenced by the milk baseline SC+ level (correlation coefficient, r > 0.80) but pH at 6 h influenced the SC+ growth observed between 6 and 24 h (r > 0.70). Thus, the initial level of SC+ in raw milk should be maintained below 100 CFU/ml and best below 40 CFU/ml. To limit growth, acidification should be managed to obtain pH values around or below 5.8 at 6 h in Saint-Nectaire cheeses and around or below 6.3 at 6 h in Salers cheeses. Enterotoxins were only detected in two Salers cheeses whose SC+ counts on day 1 were 5.55 log CFU/g and 5.06 log CFU/g, respectively, and whose pH values at 6 h were high (approximately 6.6 and 6.5, respectively). |
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Authors:
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Celine Delbes; Jomaa Alomar; Nadia Chougui; Jean-François Martin; Marie-Christine Montel |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of food protection Volume: 69 ISSN: 0362-028X ISO Abbreviation: J. Food Prot. Publication Date: 2006 Sep |
Date Detail:
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Created Date: 2006-09-25 Completed Date: 2006-10-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7703944 Medline TA: J Food Prot Country: United States |
Other Details:
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Languages: eng Pagination: 2161-7 Citation Subset: IM |
Affiliation:
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IINRA, Unité de Recherches Fromagères, Aurillac, F-15000, France. cdelbes@clermont.inra.fr |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle Cheese / microbiology* Colony Count, Microbial Consumer Product Safety Enterotoxins / biosynthesis* Food Microbiology* Humans Hydrogen-Ion Concentration Milk / microbiology* Staphylococcus aureus / growth & development*, metabolism* Temperature Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Enterotoxins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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