starch dispersions may be considered as composite materials comprising of swollen granules (amylopectin) dispersed in a continuous biopolymer matrix (amylose). Alloncle et al. (1989) reported that in galactomannan (e.g. locust bean gum) and corn starch mixture dispersions, gums are located within the continuous phase (amylose). Consequently, if the volume of this phase is reduced, it will cause an obvious increase in the concentration of gum in the continuous phase, thereby resulting in higher viscosity. The shear thinning behavior of HP treated mixtures could be due to the alteration in macromolecular organization of the mixtures at variable shear rates and applied pressures (Oh, Pinder et al., 2008).