Physicochemical properties of starch-maltodextrin and starch-maltodextrin-glucose systems
Keywords:starch, maltodextrin, glucose, flow curves, retrogradation
Starch is a widely used food additive. The addition of other ingredients changes the physical properties of resulting systems. The aim of this study was to investigate the rheological characteristics and susceptibility to retrogradation of starch-maltodextrin and starch-maltodextrin-glucose systems. Flow curves of 5% starch - maltodextrin and starch-maltodextrin-glucose pastes were tested by using rotational rheometer. The susceptibility to retrogradation of 2% pastes starch-maltodextrin and starch-maltodextrin-glucose systems by means of turbidimetric method was evaluated. It was found that all samples (systems) were a non-Newtonian, pseudoplastic fluids, with tend to the yield stress. Moreover addition of low and high DE maltodextrins and glucose to the starch caused a decrease in the values of shear stress throughout whole shear rate range. Starch pastes with greater concentration of the maltodextrins had less tendency to retrogradation. Also addition of glucose to starch-maltodextrin systems reduce the susceptibility to retrogradation.
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