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 −1with 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= K 0+ K 1 C α Ca+ K 2 C ß Na+ K 3 C ϵ G.

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