DIPPING SOLUTIONS OF NISIN AND BUFFERED SODIUM CITRATE SUPPLEMENTED WITH SODIUM DIACETATE FAIL TO PREVENT GROWTH OF LISTERIA MONOCYTOGENES ON VACUUM PACKAGED BEEF FRANKFURTERS STORED AT 4 AND 10°C UNDER MODEL CONDITIONS

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S. KUMARI
O. TOKARSKYY
D.L. MARSHALL

Keywords

Abstract

This study evaluated commercially available dip solutions of nisin alone, buffered sodium citrate combined with sodium diacetate (BSCSD), and combined solution of the three antimicrobials for potential to control growth of surface-inoculated Listeria monocytogenes during vacuum packaged refrigerated storage of model beef frankfurters. None of the treatments prevented growth of L. monocytogenes during Frankfurter storage. The combined treatments slowed growth of L. monocytogenes better than individual treatments. Failure to completely eliminate L. monocytogenes on frankfurters or inhibit outgrowth during storage might be attributed to high initial L. monocytogenes inoculum levels, insufficient quantities of antimicrobials to interact with all the target cells, low nisin activity at high pH, or presence of resistant subpopulations, such as nisin-resistant strains. The model conditions used in the experimental setup, such as elimination of natural microbiota from frankfurters and nutrient-rich diluent used for Listeria introduction on the surface, could also contributed to enhanced survival and growth of the pathogen.
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