Survival of Listeria monocytogenes in postpasteurized precooked beef roasts

The potential for Listeria monocytogenes to survive various times and temperatures of postpasteurization in precooked beef roasts was investigated. Precooked eye of round roasts were inoculated with 10(9) cells of L. monocytogenes per package prior to packaging in cook-in bags and postpasteurization...

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Bibliographic Details
Published in:Journal of food protection 1993-08, Vol.56 (8), p.655-660
Main Authors: HARDIN, M. D, WILLIAMS, S. E, HARRISON, M. A
Format: Article
Language:English
Subjects:
alimentos
almacenamiento
beef
Biological and medical sciences
carne de res
Food industries
foods
Fundamental and applied biological sciences. Psychology
listeria monocytogenes
Meat and meat product industries
pasteurisation
pasteurizacion
pasteurizing
produit alimentaire
stockage
storage
supervivencia
survie
survival
temperatura
temperature
temps
tiempo
time
viande bovine
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Summary:The potential for Listeria monocytogenes to survive various times and temperatures of postpasteurization in precooked beef roasts was investigated. Precooked eye of round roasts were inoculated with 10(9) cells of L. monocytogenes per package prior to packaging in cook-in bags and postpasteurization. Four groups of roasts (n = 54) each containing 27 uninoculated and 27 inoculated roasts were allotted to four pasteurization treatments consisting of two different exposure temperatures (91 degrees C, 96 degrees C) and two different dwell times (3 min, 5 min). Equal numbers of inoculated and uninoculated roasts from each treatment were then stored at 4 and 10 degrees C. Triplicate samples of inoculated and uninoculated roasts were sampled on day 1, 4, 8, and 12 for product stored at 10 degrees C and 1, 8, 14, 28, and 56 d for product stored at 4 degrees C. Survivors were encountered for every treatment employed. The lethality of the treatment was directly related to an increase in dwell time and postpasteurization temperature. Treatment 4 (96 degrees C, 5 min) was found to decrease the L. monocytogenes population the greatest (p < 0.05) and also maintained a lower (p < 0.05) count from its initial inoculum level during storage at both 4 and 10 degrees C.
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028X-56.8.655