The Effect of Combination of Sorbitol and Polyethylene Glycol on Physicochemical Properties of Gelatin Films Made From (Parastromateus Niger)

In current study, the effect of two plasticizers, sorbitol and poly ethylene glycol 400 (PEG 400), at different ratios (5:5, 5:10, 5:15, 10:5, 10:10, 10:15, 15:5, 15:10 and 15:15) of on physicochemical properties of gelatin films from black pomfret (Parastromateus niger) were investigated. Plasticizers are low-molecular-weight Compounds which compounded into polymer molecules to improve its flexibility. With increasing amount of plasticizers, tensile strength and elastic modulus of gelatin films decreased whereas elongation at break (EAB) increased. That effect was the result of plasticizer molecules diffusion into polymer and weaken the polymer-polymer interactions which significantly led to increasing film elongation. High degree of opacity of the films was observed in the high plasticized films and the opacity of PEG plasticized films at 15% concentration was higher than the sorbitol ones at the same concentration (P