Use of Capillary Tubes and Plate Heat Exchanger to Validate U.S. Department of Agriculture Pasteurization Protocols for Elimination of Listeria monocytogenes in Liquid Egg Products
Abstract:D -values for a ﬁve-strain cocktail of Listeria monocytogenes in ﬁve different liquid egg products (whole egg, egg yolk, egg white, egg yolk + 5% sucrose + 5% NaCl, and egg yolk + 10% NaCl) were determined using 100-μl capillary tubes. The egg products were inoculated with approximately 1 × 1010 organisms/ml and heated in capillary tubes to temperatures ranging from 53 to 69°C for various time intervals. Using a pilot scale plate heat exchanger, the U.S. Department of Agriculture (USDA) protocols for pasteurization were also evaluated using egg products inoculated with approximately 1 × 107 L. monocytogenes/ml. Results of experiments with capillary tubes suggested that all processes would result in less than the 9D process recommended by USDA. Moreover, although pasteurization with a plate heat exchanger provided greater lethality than did capillary tubes, all products still received less than a 5.4D process. Hence, these results suggest that the current USDA protocol may not be adequate to assure a large margin of safety.
Document Type: Research Article
Affiliations: Center for Food Safety and Quality Enhancement, University of Georgia, Griffin, Georgia 30223, USA
Publication date: July 1, 2000
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