Effect of gums on the Theological characteristics and microstructure of acid-induced SPI-gum mixed gels

摘要

The effect of addition of xanthan gum (XG) and guar gum (GG) on the Theological properties and microstructure of glucono-8-lactone induced soy protein isolate (SPl)-XG gels and SPI-GG gels was investigated using steady and dynamic Theological tests, creep-recovery and confocal laser scanning microscopy (CLSM). Results showed that the apparent viscosity of SPI-gum (XG, GG) mixed solutions increased with the increase in the gum (XG, GG) concentration. The storage (C) and loss (G") moduli of SPI-gum (XG, GG) mixed gels increased in the presence and increase in the gum (XG, GG) concentration. The Burger's model fitted the creep recovery data well (R~2 > 0.919) and showed that both the instantaneous and equilibrium (retarded) elastic components of this model increased with the increase in SP1 and gum concentrations. The proportion occupied by gum in mixed gels was found to increase with the increase in the concentration of gums which increased the density of protein aggregates in the mixed gels.