The Effect of Physical Damage on Large and Small Barley Starch Granules

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Abstract
Barley starch from a Scottish brewing barley (Golden Promise) has been isolated, purified and fractionated into two populations according to the granule sizes. The effects of physical damage on the two types of granules have been examined by iodine staining, debranching, gel chromatography, viscosity measurements and scanning electron microscopy. The amylose content of large starch granules was slightly greater than that of the small granules and the effect of physical damage did not differ significantly between the two types of granules. Physical damage to both types of granules in the dry state followed by extraction with cold water resulted in the preferential solubilization of low molecular weight amylopectin.