Water-insoluble protein-based edible barrier coatings and films

摘要

This invention describes new water-insoluble protein-based edible coatings and films having improved barrier and mechanical properties, and methods for their preparation from water-soluble proteins. In the invention, aqueous protein solutions are denatured with heat, chemicals and/or enzymes to induce thiol-disulfide interchange and thiol oxidation reactions, thereby forming new intermolecular and intramolecular disulfide crosslinkages. The formation of covalent intermolecular crosslinkages in protein-based edible films and coatings results in films having improved barrier and mechanical properties which are insoluble in water. Water-insoluble emulsion film systems can be formed by incorporating lipids into the denatured aqueous protein matrix.