Effects of Plasma treatment on properties of protein-based film-forming solutions
GAO Wenjing1, LEI Qiao1,2,3*, QIE Zihan1, CAO Qinglong1
1 (College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China) 2 (Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai 201306, China) 3 (Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation(Shanghai), Ministry of Agriculture, Shanghai 201306, China)
Abstract: The present study was designed to explore the effects of Plasma treatment on properties of protein-based film-forming solutions. For this purpose, the WPI-NaCas-GLY composite film-forming solution was treated with atmospheric pressure cold Plasma of 30 W at different temperatures for 0, 5, 10, 15, 20, 30, 40 and 60 min respectively. Changes of chromaticity, pH, particle size, surface tension, foaming properties and emulsifying capacity of the film forming solution during the treatment were observed. The results showed that the yellowness of the film forming solution rose while the pH value waved to decline. Protein polymerization increased the size of protein macromolecule particles in solution at a rate of doubling every 5 minutes which due to the reaction between reactive oxygen species and nitrogen species induced by plasma. The protein carbonyl groups and free SH groups increased and decreased one time respectively. Moreover, the surface tension of the matrix reduced to 35 mN/m and the foaming capacity was reduced by 10%. Meanwhile, the foam stability was significantly improved (P<0.05) from 74.99% to 94.60% and the emulsification capacity reached 0.12 m2/g. Furthermore, the resulting tensile strength of the composite protein film was increased by 0.5 MPa, light transmittance decreased, the oxygen transmission rate was reduced to 0.53 cc/(m2·d) and the water vapor transmission coefficient was reduced by 40%. It was inferred that the timely Plasma treatment could effectively improve the hydrophobicity, foaming ability, and emulsification properties of protein-based film-forming solution and got the ideal composite protein film.
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