Use of a centrifugal pump to peel and facilitate separation of grain sorghum kernels into three fractions wasinvestigated. Special emphasis was given to separating fractions to achieve a high concentration of wax in one fractionand a high concentration of starch in another. Trials were conducted to determine the effects of both soak time andrecirculation time on wet-peeling. After peeling, three fractions, peeled kernel, bran, and suspended solids, werecollected. Together, the bran and suspended solids fractions contained 12.7% of the initial total dry solids, 90% of initialwax, and 8.1% of the initial starch. Peeled kernel fraction accounted for 84% of the initial dry material, which contained94% of the initial starch with 8.5% of the initial wax. Circulation through the pump for 5 min resulted in over 90% of thewax being concentrated in bran and suspended solids fractions, and over 90% of the starch was recovered in peeledkernel fractions. Soaking for 10 min versus no soaking increased the starch available in the peeled kernel fraction to 94%.Circulation time through the centrifugal pump had a more significant effect on separation of constituents than the soakperiods studied.
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Lochte-Watson et al. (2000) studied this question.