Physicochemical Properties of Phosphorylated Rice Starch

인산 쌀 전분의 이화학적 특성

  • Published : 1994.04.01

Abstract

Starch phosphates were prepared by dry heating method using sodium triphosphate as a substitution reagent and their physicochemical properties were investigated with the chucheongbyeo and samkangbyeo. The solubility and swelling power of rice starches were increased by phosphorylation reaction. The solubility of the chucheongbyeo was greater than that of samkangbyeo , but the swelling power was appeared in vice versa. The transparency of raw starch was increased at the 6$0^{\circ}C$, but phosphorylated rice starch was begun to increase from 5$0^{\circ}C$. Light transmittance was higher inthe phosphorylate drice starch. The lightness of phosphyorylated rice starch decreased more than that of raw starch. Whereas the yellowness of phosphorylated rice starch increased. The temperature of initial gelatinization of the phosphorylated chucheong and samkang rice starch was shown to 5$0^{\circ}C$ and 53$^{\circ}C$, respectively. lowering 14-15$^{\circ}C$ in temperatureby the phosphorylation . The viscosity as well as by the phosphorylation reaction was raised 7.4-8.4 times, respectively. The hardness, adhesiveness, cohesiveness and texture which is rheological properties of starch gel increased by the phosphoryulation reaction. The chucheong rice starch gel was slightly higher in its rheolgocial values thanthat of the samkang rice starch gel. The rice starch particles were shown to polygonal structure, but they were deformed in the phosphorylated starch.

Keywords

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