| Effect of gamma irradiation on Listeria monocytogenes in frozen, artificially contaminated sandwiches. | |
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MedLine Citation:
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PMID: 12430695 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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S Clardy; D M Foley; F Caporaso; M L Calicchia; A Prakash |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of food protection Volume: 65 ISSN: 0362-028X ISO Abbreviation: J. Food Prot. Publication Date: 2002 Nov |
Date Detail:
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Created Date: 2002-11-14 Completed Date: 2003-01-21 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 7703944 Medline TA: J Food Prot Country: United States |
Other Details:
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Languages: eng Pagination: 1740-4 Citation Subset: IM |
Affiliation:
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Department of Food Science and Nutrition, Chapman University, Orange, California 92866, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Colony Count, Microbial Consumer Product Safety Dose-Response Relationship, Radiation Food Handling / methods* Food Irradiation* Freezing Gamma Rays Humans Listeria monocytogenes / radiation effects* Meat Products / microbiology* Taste |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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