Abstract
Pork is often marketed in packages with high oxygen atmosphere (MAP) or vacuum to improve shelf life and appearance. As silver ions have antibacterial effects, food contact films coated with silver might improve the shelf life of meat. In the present study, pork was wrapped in commercially available films, coated with nanosilver particles, and stored in the two packaging variants MAP and vacuum for 12 days. During storage, samples were analyzed on days 1 (before packaging), 4, 8 and 12 for microbiological contamination, meat quality (e.g., pH, color), and for the percentages of the myoglobin (Mb) redox forms. In addition, the effects of the film were examined after inoculation of the meat with high quantities of methicillin-resistant Staphylococcus aureus (MRSA) cells before vacuum storage for 8 days. MAP storage resulted in higher lightness (L*) values, lower liquid loss and higher Mb oxidation compared to vacuum. Microbiological spoilage was partly affected by the packaging variants with reducing effects of the MAP. The nanosilver-coating only affects the Mb redox form percentages of the pork cutlets and on day 4 the L* values, whereas microbiological parameters were not influenced. As the nanosilver coating had no influence on the total viable bacteria counts as well as Pseudomonas spp., Enterobacteriaceae and MRSA counts, an advantage of the nanosilver coating on the shelf life could be excluded.
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This study was funded by the Ahrberg Foundation, Hannover, Germany. The authors gratefully acknowledge all the people participating the time-consuming meat collections and analyses.
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Kernberger-Fischer, I., Kehrenberg, C., Klein, G. et al. Influence of modified atmosphere and vacuum packaging with and without nanosilver-coated films on different quality parameters of pork. J Food Sci Technol 54, 3251–3259 (2017). https://doi.org/10.1007/s13197-017-2768-4
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DOI: https://doi.org/10.1007/s13197-017-2768-4