The polydisperse nature of gelatin molecules with the presence of unfolded proteins of high-molecular weight results in a film of considerable thickness, with extremely high deformability. When the soybean proteins (with their globular structure partially preserved) were introduced at low concentrations (25S:75G), gelatin aggregation as well as gelatin–SPI interactions were induced, leading to a notable reinforcement of the composite film. As the proportion of soybean protein increased, the gelatin matrix approached saturation, so that the consequent formation of localized independent soybean matrices reduced the film's mechanical properties (both the breaking force and its deformation).
Furthermore, SPI, having higher surface hydrophobicity than gelatin, contributed to the higher water-vapor barrier of the composite films. Although some physical properties have been improved (mainly the breaking force and the WVP), these composite films are nevertheless highly water-sensitive, making them still far from being a real alternative to the synthetic polymers. Soybean-protein–gelatin composite films could, however, serve as an efficient carrier of active components use in food preservation or for designing functional foods.
The polydisperse nature of gelatin molecules with the presence of unfolded proteins of high-molecular weight results in a film of considerable thickness, with extremely high deformability. When the soybean proteins (with their globular structure partially preserved) were introduced at low concentrations (25S:75G), gelatin aggregation as well as gelatin–SPI interactions were induced, leading to a notable reinforcement of the composite film. As the proportion of soybean protein increased, the gelatin matrix approached saturation, so that the consequent formation of localized independent soybean matrices reduced the film's mechanical properties (both the breaking force and its deformation).Furthermore, SPI, having higher surface hydrophobicity than gelatin, contributed to the higher water-vapor barrier of the composite films. Although some physical properties have been improved (mainly the breaking force and the WVP), these composite films are nevertheless highly water-sensitive, making them still far from being a real alternative to the synthetic polymers. Soybean-protein–gelatin composite films could, however, serve as an efficient carrier of active components use in food preservation or for designing functional foods.
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