This study was carried out to compare the varietal difference in physiochemical properties and textural properties of waxy rice cultivars. Crude protein had 5.9-7.2% varietal difference while crude lipid and crude ash contents were within the range of 0.8-2.0% and 0.3-0.6% and had a similar tendency as non-waxy rice. The amylose content was within the range of 1.79-1.93% and did not show significant differences among the tested cultivars. The water binding capacity of Hwaseonchal of the japonica cultivars scored the highest, Sinseonchal showed the lowest, while tongil-type Hangangchal showed a lower value, which can be due to a higher internal density. Baekseolchal showed the highest alkali digestion value and Sinseonchal showed the lowest. In amylogram characteristics, Baekseolchal showed the lowest value and Hwaseonchal and Sangjuchal showed higher initial temperature. Hangangchal scored higher in peak viscosity, breakdown viscosity, and final viscosity. It was prospective for all the cultivars to show slow retrogradations due to low setbacks compared to non-waxy rice and Hangangchal which showed the lowest setback. X-ray diffraction of waxy rice starch particles was typical A pattern. Hangangchal scored the highest and Hwaseonchal scored the lowest in crystallinity. One of the characteristics of cooked rice made from waxy rice is the hardness, which shows degrees of retrogradations, increased in storage time. Hangangchal showed a higher range of transformation with time and a higher retrogradation rate.
The highly producible rice cultivars, hanareum and dasan 2, were prepared and investigated for their physicochemical properties, and the quality characteristics of frozen cookie dough with rice flour according to the thawing time were measured. The water, ash, crude protein, amylose, and damaged starch contents of rice flour, as well as its water holding capacity, particle size, and Hunter color value, were measured. The water, ash, and crude protein contents of the hanareum and dasan 2 rice flours were shown to range from 7.28 to 13.14%, from 0.35 to 0.39, and from 6.05 and 8.68%, respectively. The protein content of the control group was higher than that of hanareum and dasan 2 rice flours. The amylose contents of the hanareum and dasan 2 rice flour were 19.05 and 23.04%, respectively. The damaged starch content and water holding capacity of the control group were lower than those of the hanareum and dasan 2 rice flours. The particle sizes of the samples were 48.54~50.05 μm. The lightness values of the hanareum, and dasan 2 rice flour, and of the control were 93.72, 93.51 and 92.63, respectively. The quality characteristics of the gluten-free frozen cookie dough were investigated. The lightness of the cookie made with frozen cookie dough decreased according to the by thawing time, but the diameter of the cookie did not differ significantly. The hardness of the cookie made with rice frozen dasan 2 rice dough was lower than that of the cookie made with frozen hanareum rice dough.
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