Investigation of the film-forming ability of proteins subjected to UV treatment for the dairy industry development

Film-forming mixtures based on reconstituted solutions of whey protein concentrates (WPC) with a protein content of 2.0 and 5.0% were subjected to UV irradiation in the range from 90 to 150 J/ml. With an increase in the dose of UV irradiation in film-forming solutions, the solubility of the protein decreased, the greatest effect was achieved in a mixture with a protein content of 2.0%. The decrease in solubility indirectly proved the process of aggregation of protein molecules in the studied solutions. It has been shown that UV exposure improves the strength properties of protein films. The highest specific stress at film rupture at an irradiation dose of 150 J/ml was 23.11 MPa in a 5.0% protein solution and 5.74 MPa in a 2.0% solution. The indicator of the applied force increased more intensively when processing a 5.0% protein solution, and amounted to 16.00 N in the case of a 2.0% solution, and 24.82 N in a 5.0% solution.