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Fate of Listeria monocytogenes and Salmonella Species in Ground Beef Jerky

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Abstract:

Home-style drying procedures used for jerky made from whole meat strips may be insufficient to eliminate bacterial pathogens from jerky made from ground meat due to the possible distribution of pathogens throughout the product. The fate of Listeria monocytogenes and Salmonella species during preparation of ground beef jerky was determined. Ground beef was inoculated with these pathogens to a level of approximately 106 CFU/g prior to drying. A drying method shown to reduce the population of these microorganisms by 5 log CFU/g on jerky made with beef loin strips in a home-style dehydrator maintained at 60°C (140°F) was used with unheated samples and samples heated to 71.1°C (l60°F) prior to drying, with and without cure mix. Populations of each pathogen type were determined after 0, 2, 4, 6 and 8 h of drying. In unheated samples without cure mix, there was only a 2.5 to 4 log reduction in the pathogens after 8 h of drying. When cure mix was added, the populations were reduced by at least 4 logs. Population reductions in heated samples without cure were approximately 3.8 log CFU/g for Salmonella and Listeria. Addition of the cure mix resulted in a greater reduction in Salmonella populations in the heated samples.

Keywords: GROUND BEEF JERKY; LISTERIA MONOCYTOGENES; SALMONELLA

Document Type: Research Article

Affiliations: 1: Cooperative Extension Service, The University of Georgia, Hoke Smith Annex, Food Science Building, Athens, Georgia 30602, USA 2: Center for Food Safety and Quality Enhancement, Department of Food Science and Technology, The University of Georgia, Food Science Building, Athens, Georgia 30602, USA

Publication date: September 1, 1997

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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