Document Detail

Effect of gamma irradiation on Listeria monocytogenes in frozen, artificially contaminated sandwiches.
MedLine Citation:
PMID:  12430695     Owner:  NLM     Status:  MEDLINE    
Gamma irradiation has been shown to effectively control L monocytogenes in uncooked meats but has not been extensively studied in ready-to-eat foods. The presence of Listeria in ready-to-eat foods is often due to postprocess contamination by organisms in the food-manufacturing environment. Because gamma irradiation is applied after products are packaged, the treated foods are protected from environmental recontamination. Currently, a petition to allow gamma irradiation of ready-to-eat foods is under review by the Food and Drug Administration. This study was conducted to determine if gamma irradiation could be used to control L. monocytogenes in ready-to-eat sandwiches. Ham and cheese sandwiches were contaminated with L. monocytogenes, frozen at -40 degrees C, and exposed to gamma irradiation. Following irradiation, sandwiches were assayed for L. monocytogenes. A triangle test was performed to determine if irradiated and nonirradiated sandwiches differed in sensory quality. We found that the D10-values ranged from 0.71 to 0.81 kGy and that a 5-log reduction would require irradiation with 3.5 to 4.0 kGy. The results of a 39-day storage study of sandwiches inoculated with 10(7) CFU of L monocytogenes per g indicated that counts for nonirradiated sandwiches remained fairly constant. Counts for sandwiches treated with 3.9 kGy decreased by 5 log units initially and then decreased further during storage at 4 degrees C. Sensory panelists could distinguish between irradiated and nonirradiated sandwiches but were divided on whether irradiation adversely affected sandwich quality. Our results suggest that manufacturers of ready-to-eat foods could use gamma irradiation to control L. monocytogenes and improve the safety of their products.
S Clardy; D M Foley; F Caporaso; M L Calicchia; A Prakash
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of food protection     Volume:  65     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-14     Completed Date:  2003-01-21     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1740-4     Citation Subset:  IM    
Department of Food Science and Nutrition, Chapman University, Orange, California 92866, USA.
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MeSH Terms
Colony Count, Microbial
Consumer Product Safety
Dose-Response Relationship, Radiation
Food Handling / methods*
Food Irradiation*
Gamma Rays
Listeria monocytogenes / radiation effects*
Meat Products / microbiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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