the packing and even the excessive packaging of products for human consumption is a current practice in the industrialized countries . as this packaging is made primarily of non - biodegradable polymers , they currently cause environmental problems . these environmental problems are found not only in industrialized countries but also in developing countries . this situation supported the development of various films , more ecological , starting from biodegradable elements containing polysaccharides , proteins and / or lipids . we developed a biodegradable protein film from a casein salt . of dairy origin , casein is abundant and could even be recovered from unsold milk . the process of polymerization is induced by gamma irradiation . indeed , the interaction of hydroxyl radicals with tyrosins present in protein creates a covalent bond . the addition of a plasticizing agent is essential in order to produce a more flexible and less friable film . the presence of glycerol does not inhibit the formation of bityrosine . it protects protein from the denaturation caused by irradiation , increases the deforming capacity and decreases the breaking strength of film . the biodegradation tests , carried out in our laboratories , showed that the film produced by gamma irradiation is accessible to the enzymatic attacks from pseudomonas fragi .