The molecular properties of three sorghum starches and their components have been compared by methods involving iodine staining, enzymic degradation and gel chromatography. The starches from the red and chalky varieties were very similar in properties and in amylose to amylopectin ratio, but differed in their molecular weight distribution profiles. The waxy sorghum starch was fractionated by the thymol‐butanol method to yield a small quantity of amylose. The three starch samples were all resistant to dissolution in boiling water but when subjected to physical damage the granules became partly soluble in cold water and almost totally soluble in boiling water.
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Craig et al. (1984) studied this question.
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