| Antimicrobial properties of a commercially processed polyethylene film coated with AgION™ silver zeolite were tested for its ability to inhibit growth of four strains of Listeria monocytogenes (CWD 95 and 246 from silage, CWD 201 from raw milk, and CWD 1503 from ground turkey). The surface of the films was inoculated with Listeria monocytogenes , and was inhibited 1.34 logs, respectively, on trypticase soy agar (TSA) containing 0.6% yeast extract (TSA-YE) after 24 hours of storage at 37°C.; The antimicrobial properties of the film were also tested over 48 hours of storage at 4°C and 12°C, on beef bologna packaged in film inoculated with Listeria monocytogenes at a level of 106 CFU/cm2. The bologna was examined at specified intervals for numbers of Listeria monocytogenes, mesophilic aerobic bacteria (MAB), and lactic acid bacteria (LAB). During 48 hours of storage, Listeria populations decreased 0.39 and 0.05 logs, at 4°C and 12°C, respectively. At both temperatures, MAB populations decreased 0.07 logs at 4°C and 0.08 logs at 12°C using antimicrobial film compared to antimicrobial-free control film. At 4°C LAB populations were unchanged at 6.91 logs, while at 12°C the antimicrobial film decreased LAB populations 0.25 logs compared to antimicrobial-free film. |
