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Control of Listeria monocytogenes on commercially-produced frankfurters prepared with and without potassium lactate
A C S Porto-Fett1, S G Campano, J L Smith
1US Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Microbial Food Safety Research Unit, Wyndmoor, PA 19038, USA. John.Luchansky@ars.usda.gov
Abstract:
Viability of Listeriamonocytogenes was monitored on frankfurters formulated with or without potassium lactate and sodium diacetate at a ratio of ca. 7:1 and treated with lauric arginate (LAE; 22 or 44ppm) using the Sprayed Lethality in Container (SLIC(R)) delivery method. Without antimicrobials, pathogen numbers remained relatively constant at ca. 3.3logCFU/package for ca. 30d, but then increased to ca. 8.4logCFU/package over 120d. Regardless of whether or not lactate and diacetate were included, when treated with LAE, pathogen numbers decreased from ca. 3.3logCFU/package to ca. 1.5logCFU/package within 2h, but then increased to 7.3 and 6.7logCFU/package, respectively, after 120d. When frankfurters were formulated with lactate and diacetate and treated with LAE, pathogen numbers decreased by ca. 2.0logCFU/package within 2h and remained relatively unchanged over the 120d. These data confirm that LAE provides an initial lethality towards L. monocytogenes and when used in combination with reduced levels/ratio of lactate and diacetate as an ingredient for frankfurters provides inhibition throughout shelf life.
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