Aktif paketleme filmlerinden su ve antimikrobiyal madde difüzyonu

The release of antimicrobial agents (potassium sorbate, nisin, and chitosan) which the activity of them depends on the migration from the packaging films to the food surface and the apparent diffusivity constants (D) were examined. Moisture sorption isotherms of the active packaging films were an important parameter for the migration of the agents. In the study moisture sorption isotherms of the films were investigated and D of the films was evaluated. The release kinetics of potassium sorbate (1, 3, and 5%) and nisin (1, 2, and 3%) from polyethylene films were described using Fick?s second law of diffusion and D were found to be 4.21×10-21, 1.75×10-20 and 2.73×10-20 cm2/s at 25°C; 1.55×10-19, 2.69×10-19 and 2.82×10-19 cm2/s at 35°C, respectively. The release of chitosan from polyethylene films could not be detected. The moisture equilibrium isotherms of the films containing potassium sorbate, nisin and chitosan were determined by the Dynamic Vapor Sorption (DVS) method using the instrument, the DVS Intrinsic. Guggenheim, Anderson and De Boer (GAB) model was chosen the most suitable equation to define the adsorption isotherms of the films. The monolayer moisture content (Mo) of the films containing potassium sorbate 2%, nisin 3%, and chitosan 3% were 1.89, 0.29 and 0.09 at 20°C, respectively. D of the films between water activities of 70% to 80% RH were found as 4.12x10-20, 8.35x10-19 and 3.23x10-21 cm2/s at 20°C, respectively for potassium sorbate (2%), nisin (3%) and chitosan (3%) containing films. Keywords: Active packaging, antimicrobial agent, diffusion, moisture sorption