Abstract
The physicochemical properties and molecular structures of waxy rice starches isolated from the newly inbred Korean varieties, Nunbora, Baegseolchal, Baegokchal, and Boseokchal were investigated. Nunbora had the highest ash and crude protein contents and the lowest damaged starch content and solubility at 80°C. The amylopectin contents of all samples were in the range of 98.35–98.84%. All the four waxy rice starches showed A-type crystallinity by x-ray diffraction pattern. Baegseolchal had the lowest pasting temperature (71.9°C), but the highest peak (320.1 RVU) and trough (210.5 RVU) viscosities. Nunbora had the highest pasting temperature, breakdown and setback viscosities. Beagseolchal had the lowest gelatinization temperatures, 63.12 (to) and 68.59°C (tp); however all waxy rice starches did not show significantly different gelatinization enthalpy change (10.25–11.09 J/g). The molecular weight of samples ranged from 4.55×107 to 5.15×107 g/mol. Baegseolchal had the highest proportion (30.02%) of shorter branch chains (DP 6–12) but the lowest proportion of DP 13–24.
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