Preparation and Characterization of Whey Protein Film Incorporated with TiO2 Nanoparticles英文电子书.pdf

JFS N: Nanoscale Food Science, Engineering, and Technology Preparation and Characterization of Whey Protein Film Incorporated with TiO2 Nanoparticles J.J. ZHOU, S.Y. WANG, AND S. GUNASEKARAN ABSTRACT: Biodegradable titanium dioxide (TiO )/whey protein isolate (WPI) blend films were made by casting 2 denatured WPI film solutions incorporated with TiO2 nanoparticles. X-ray diffraction, UV-vis spectra, and fluo- rescence spectra of the films showed the successful incorporation of TiO2 nanoparticles into the WPI matrix and indicated the interactions between TiO2 and WPI. Mechanical tests revealed the antiplasticizing effect of TiO2 nanoparticles on the WPI/TiO2 film. Small amounts (1 wt%) of added TiO2 nanoparticles significantly increase the tensile properties of WPI film, but also decrease the moisture barrier properties. The addition of higher amounts (1 wt%) of TiO2 improves moisture barrier properties but lowers the tensile properties of the film. Microstructural evaluation confirmed the aggregation and distribution of TiO2 nanoparticles within the WPI matrix and validated the results of functional properties of the WPI/TiO2 film. Keywords: mechanical properties, microstructure, TiO2 nanoparticles, water vapor permeability, whey protein isolate films Introduction deterioration, and allergens on the presence of radiation of rela- lasticized, self-supporting films made of globular proteins are tively low wavelength near the ultraviolet region. Thin TiO2 films Ppotentially useful as edible coatings and wrappings (Lefevre