Effects of bentonite combinations and gelatin on the rheological behaviour of bentonite - Apple juice dispersions

Abstract

Rheological behaviour of bentonite - apple juice suspensions were experimentally determined at 25 °C, within the shear rate range of 4.3 to 43.1 s-1 with 0.90, 1.33 and 2.66 g/L bentonite mixtures and 0 to 0.25 g/L (on dry basis) gelatin concentrations. The mixtures consisted of 100%, 80%, 60%, 40% 20% and 0% Ca-bentonite and balance Na-bentonite combinations. The experimental data were described with the power law as τ = Kγ.1.56. The consistency index was related to the calcium, sodium and gelatin concentrations as K = K0 + K1CαCa + K2CβNa + K3CεG. ©1996 Academic Press Limited.