Abstract
In this study, the effects of the addition of various polysaccharides (konjac gum, gellan gum, and curdlan gum) on the rheological and textural properties of calcium sulfate-induced soy protein isolate gels were investigated. The incorporation of konjac gum and curdlan gum at 0.3 and 0.5% (w/v) concentrations and gellan gum at 0.5% concentration significantly enhanced (P < 0.05) the hardness and water-holding capacity of the resultant gels. The increased elastic moduli during and after gelation, reinforced fracture stress, and lowered onset gelling temperature indicated that the addition of the abovementioned polysaccharides strengthened gel structures and accelerated gelation. Confocal laser scanning microscopy analysis revealed that the polysaccharides also improved gel microstructures, with the gels containing konjac gum displaying the highest homogeneity. The findings of this study may provide important information for the development of innovative soy protein isolate-based gel products with improved texture.
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