Electron Beam Crosslinking of Glycerol-Plasticized Tilapia Gelatin for Enhanced Biopolymer Film Performance

Polymer films derived from fish gelatin were evaluated for their moderate absorbency and moisture protection properties. To improve mechanical strength and hydrophilicity, irradiation-induced crosslinking was applied. Tilapia skin gelatin, plasticized with glycerol, served as the base material for assessing the effects of varying electron beam irradiation dose on the biopolymer’s performance. The formulations were optimized and analyzed for changes in gel content, swelling capacity, and mechanical properties following irradiation. Water vapor transmission rate (WVTR) measurements were used to confirm the effective integration of the crosslinker and glycerol into the gelatin matrix, providing insights into the permeability of the films. This study supports the development of fish gelatin-based biopolymers with improved functionality for use in environmentally friendly and biodegradable products, potentially enhancing shelf life and product quality. Gel content is improved up to 15 kGy only, and swelling capacity is reduced due to irradiation doses. WVTR is decreased by an increase in irradiation doses due to less permeable films produced after being irradiated. The irradiated plasticized fish gelatin films can be a promising, biodegradable film with improved moisture resistance for packaging applications.