Abstract
The influence of gamma-irradiation (32 kGy) followed by the addition of polysaccharides (potato starch, soluble potato starch, and sodium alginate) and heating on the properties of the films based on calcium caseinate (CC)-whey proteins isolate (WPI) and the gels formed with CaCl(2) was evaluated. Radiation induced an improvement of the mechanical and barrier properties of all films. The polysaccharides' effect on the irradiated and non-irradiated CC-WPI gels could be predicted as the sum of their separate effects on CC and on WPI, apart from the alginate interaction with the irradiated CC-WPI. The better properties of the films achieved after admixing polysaccharides to the formerly irradiated protein solution correspond to the smaller strength of gels. Properties of the films and gels prepared using the irradiated proteins and alginate differed depending on whether alginate was admixed before or after irradiation. Results were related to the protein structure, interaction with polysaccharides, and the film's microstructure.
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