PHYSICOCHEMICAL CHARACTERISTICS AND FUNCTIONAL-PROPERTIES OF STARCH FROM A HIGH BETA-GLUCAN WAXY BARLEY

The physicochemical properties and functional characteristics of starch from a high beta-glucan waxy barley were compared with those of starches isolated from normal and high amylose barleys. Amylose content of the starches ranged from 1.9 to 34.8%. There was no relationship between amylose content and water binding capacity and gelatinization temperature of the starches. Amylose content and swelling power as well as enzyme susceptibility were negatively correlated. Waxy barley starches had a lower solubility than amylose-containing starches. High amylose barley starch registered no swelling in the Amylograph. Amylose content in starch proved to be very important for good bread- and cake baking quality. Waxy starches did not produce acceptable breads and cakes. The starch from the high beta-glucan barley variety ''Shonkin'' will be suitable as a thickening agent, but not as an ingredient in bakery products.