Retrogradation Properties of Waxy Starches

The retrogradation properties of waxy starches isolated from waxy rice(Shin sun, Tong il), waxy barley(Suwon # 227), waxy indian millet. waxy millet and Jobs tears(Yullmoo) were investigated. The extent of retrogradation determined by the glucoamyase method during freeze-thaw treatment and storage in low temperature showed that six kinds of waxy starches were very slowly retrograded. The order of the retrogradation tendencies of these starches were waxy indian millet > Suwon # 227 Waxy millet > Yullmoo > Tong il > Shin sun. Waxy indian millet and Suwon # 227 starches were distinctively retrograded compared with other starches. Retrogradation properties observed during freeze-thaw 30 cycles were similar to those of storage for 30 days at . Suwon # 227, which has been the only recommened variety in our nation, was composed of 15% of non-waxy starch and 85% of waxy starch granule.