Estimation of starch in sorghum and other grains

Abstract

Grain is ground finely and refluxed in CaCl2 solution and protein is precipitated with zinc uranyl acetate. The percentage of starch in the grain is calculated from the optional rotation of the filtrate, taking the specific rotation of starch as 200 at 20°0.1°C and correcting for the volume of the filter paper, which goes into the volumetric flask. The method is rapid and at least 99.6% of the starch is recovered.-M. S.