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    Potential of a nisin-containing bacterial cellulose film to inhibit Listeria monocytogenes on processed meats

    Access Status
    Fulltext not available
    Authors
    Nguyen, V.
    Gidley, M.
    Dykes, Gary
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Nguyen, V. and Gidley, M. and Dykes, G. 2008. Potential of a nisin-containing bacterial cellulose film to inhibit Listeria monocytogenes on processed meats. Food Microbiology. 25 (3): pp. 471-478.
    Source Title
    Food Microbiology
    DOI
    10.1016/j.fm.2008.01.004
    ISSN
    0740-0020
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/32226
    Collection
    • Curtin Research Publications
    Abstract

    A bacterially produced cellulose film containing nisin was developed and used in a proof-of-concept study to control Listeria monocytogenes and total aerobic bacteria on the surface of vacuum-packaged frankfurters. Bacterial cellulose pellicles were produced by Gluconacetobacter xylinus K3 in Corn Steep Liquor-Mannitol Medium and were subsequently purified before nisin was incorporated into them. Investigations into the effect of nisin concentrations and contact times on incorporation of nisin into cellulose films showed that the lowest nisin concentration and shortest time needed for production of an effective antimicrobial cellulose film were 625 IU ml-1 and 6 h, respectively. The active cellulose films produced under these conditions did not, however, significantly reduce L. monocytogenes populations on frankfurters (P>0.05) during refrigerated storage for 14 days as compared to the controls. Films produced using a higher concentration of nisin (2500 IU ml-1) with the same exposure time (6 h) resulted in a significant (P<0.05) decrease in L. monocytogenes counts on frankfurters of ~2 log CFU g-1 after 14 days of storage as compared to the control. Both the above-mentioned films showed a similar effectiveness in reducing total aerobic bacterial populations as measured by total aerobic plate counts on frankfurters. For both films, total aerobic bacterial levels were significantly (P>0.05) reduced by ~3.3 log CFU g-1 after 14 days of storage as compared to control samples. Bacterial cellulose films were demonstrated in this study to have potential applicability as antimicrobial packaging films or inserts for processed meat products. © 2008 Elsevier Ltd. All rights reserved.

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