文摘
Polyethylene films coated by commercially available polyvinyldichloride (PVdC) as well as nitrocellulose (NC) lacquer with addition of natamycin preparation Delvocid® (16.7 % w/w of natamycin in lacquer) were studied at 6 and 23 °C to determine the preservative migration into distilled water. The films released natamycin at maximal level 2.34 ± 0.32 mg/dm2. The diffusion coefficient of 0.79 × 10−10 ± 0.29 × 10−10 cm2/s and 1.03 × 10−10 ± 0.17 × 10−10 cm2/s was determined for natamycin transport in PVdC lacquer layer at 6 and 23 °C, respectively. For nitrocellulose lacquer the diffusion coefficient of 0.89 × 10−10 ± 0.16 × 10−10 cm2/s was found at 23 °C. The coextruded polyamide/polyethylene film coated with the PVdC lacquer containing both nisin (16.7 % w/w of preparation Nisaplin®) and natamycin (see above) provided inhibitory effect against selected indicator microorganisms (Penicillium expansum, Fusarium culmorum, Lactobacillus helveticus, Listeria ivanovixed;). This film was unsuitable for the packaging of the surface ripened cheese Olomouckxe9; tvarůžky. On the other hand, it was able to prevent the growth of spoilage microorganisms on the surface of the packaged soft cheese Blaťxe1;ckxe9; zlato.