Relationship Among Alkali Digestive Value, Amylopectin Fine Structure and Physical Properties of Cooked Rice

要旨

This study was performed to effect of chain length distribution of amylopectin on gelatinization physical properties of cooked rice grains which were analyzed by alkali digestive value (ADV) in six rice cultivars. Those rice cultivars were Hwangumnuribyeo, Ilpumbyeo, Sangju- byeo, Taebongbyeo, Nampyungbyeo, and Dasanbyeo. The ADV values were evenly distributed from 7.0 (Hwangum- nuribyeo) to 5.0 (Dasanbyeo). A similar chain length distri- bution of amylopectin was found in rice cultivars, indi- cating that DP12 had the highest distribution. Rice cultivars with high ADV value showed higher portion of short chain distribution upto DP15. The surface hardness of cooked rice increased consecutively to Dasanbyeo, Ilpumbyeo, and Hwangumnuribyeo. Among japonica type rice cultivars, the highest overall hardness was observed in Dasanbyeo followed by Hwangumnuribyeo and Ilpumbyeo. Correlation between hardness of rice graim and chain length distribution of amylopectin had the similar inclination to surface hardness of rice grains and overall hardness.

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