Biodegradable cellulose acetate/layered double-hydroxide composite film for active packaging of fresh food

Biodegradable and active packaging films able to positively interact with fresh foods are extremely important to enhance the quality and the sustainability of the modern food industry. In this study, a novel biodegradable active packaging film is developed using thermoplastic cellulose acetate (CAT) and modified layered double hydroxide (LDH) as a filler. The active molecules, potassium sorbate, are ionically bonded to the LDH lamellae, resulting in delayed and controlled release system. By analysing the thermal and mechanical properties of the composites, it is found that the presence of the hybrid LDH-sorbate filler has a minor impact on the processability of the material, up to a concentration of 5% wt/wt. The kinetic release of the sorbate molecule from the composites films is evaluated using UV-Vis Spectroscopy, and analyzed by Brouers-Sotolongo kinetic equation. The active films are shown to be effective in preserving the physicochemical qualities of Pomegranate arils during storage. Overall, these results suggest that CAT active films have potential for use in the food industry to improve the shelf life and quality of fresh fruit.