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Changes in Escherichia coli O157:H7 numbers during holding on excised lean, fascia and fat beef surfaces at different temperatures.
MedLine Citation:
PMID:  19457044     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
AIM: To investigate changes in Escherichia coli O157:H7 numbers on excised beef carcass surfaces over 72 h at different temperatures. METHODS AND RESULTS: Excised lean meat, fascia and fat were inoculated with E. coli O157:H7 and held in an environmental chamber for 72 h, at air speed 0.5 m s(-1), relative humidity (RH) 90%, and temperatures 4, 8 and 12 degrees C. On lean, pathogen counts increased significantly at 12 degrees C. On fascia, significant reductions in counts occurred at 4 and 8 degrees C. Pathogen numbers were significantly reduced on fat at 4, 8 and 12 degrees C (64 h). Counts on fat were significantly less at all temperatures, compared to lean or fascia and surface water activity, a(w), decreased significantly over time on fat at 4 degrees C. Significant decreases in surface pH values were recorded on all meat substrates. CONCLUSIONS: The survival of E. coli O157:H7 varied in relation to the meat substrate and the holding temperature. Reductions in counts on fat surfaces appeared to be related to low surface a(w) values. No relationship between pathogen survival and surface pH was established. SIGNIFICANCE AND IMPACT OF THE STUDY: The use of excised meat pieces in an environmental cabinet offers a more flexible approach to determining the use of different chilling regimes in the production of safe meat.
Authors:
K M Crowley; D M Prendergast; D A McDowell; J J Sheridan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-04-15
Journal Detail:
Title:  Journal of applied microbiology     Volume:  107     ISSN:  1365-2672     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-10-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1542-50     Citation Subset:  IM    
Affiliation:
Food Safety Department, Ashtown Food Research Centre (formerly The National Food Centre), Dublin, Ireland. karen.crowley@teagasc.ie
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