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    The effects of temperature, chlorine and acids on the survival of Listeria and Salmonella strains associated with uncooked shrimp carapace and cooked shrimp flesh

    Access Status
    Fulltext not available
    Authors
    Wan Norhana, M.
    Poole, S.
    Deeth, H.
    Dykes, Gary
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Wan Norhana, M. and Poole, S. and Deeth, H. and Dykes, G. 2010. The effects of temperature, chlorine and acids on the survival of Listeria and Salmonella strains associated with uncooked shrimp carapace and cooked shrimp flesh. Food Microbiology. 27 (2): pp. 250-256.
    Source Title
    Food Microbiology
    DOI
    10.1016/j.fm.2009.10.008
    ISSN
    0740-0020
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/26999
    Collection
    • Curtin Research Publications
    Abstract

    The purpose of this study was to assess the influence of the association of Listeria and Salmonella with shrimp surfaces on the effects of temperature, chlorine and acids on their survival. Planktonic, attached and colonized cells of Listeria monocytogenes Scott A, L. monocytogenes V7, Salmonella Senftenberg 1734b and S. Typhimurium ATCC 14028 were challenged with high (50°, 60° and 70 °C) and low (4 °C) temperature, 100 ppm sodium hypochlorite solution, and acetic, hydrochloric and lactic acids (pH 4.0). Attached and colonized Listeria and Salmonella showed significantly greater (p < 0.05) resistance to heat (~1.3-2.6 fold increase in D-values), hypochlorite (~6.6 = 40.0 fold) and acids (~4.0-9.0 fold) than their planktonic counterparts. There were no significant differences (p > 0.05) in the survival of planktonic, attached or colonized cells of Listeria and Salmonella stored under refrigerated conditions. The association of Listeria and Salmonella with shrimp surfaces enhances their resistance to heat, chlorine and acids. Both attachment to, and subsequent colonization of, shrimp surfaces by pathogens may reduce the efficacy of methods used in their control. Strategies to reduce attachment of these pathogens to shrimp are required to assure safety of this product. Crown Copyright © 2009.

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