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KMID : 0380619840160010011
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Korean Journal of Food Science and Technology
1984 Volume.16 No. 1 p.11 ~ p.16
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Rheological Properties of Gelatinized Dilute Rice Starch Solutions
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Cho Yu-Sean
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Abstract
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Rheological properties of waxy and non-waxy rice starch solutions were evaluated with a narrow gap rotational and Cannon Fenske viscometers. The gelatinized rice starch solutions containing 0.2-1.0% starch displayed pseudoplastic flow behavior. At higher starch level, degree of pseudoplasticity of waxy rice starch solutions increased, while that of non-waxy rice did not changed apparently. The consistency coefficient (K) of non-waxy rice starch solutions increased with increasing gelatinizadon temperature, but waxy rice starch solutions remained constant, and in alkaline aqueous solutions both of them showed increasing K values. The value of K increased exponentially with an increase in concentration. The effect of the temperature on the viscosity of the solutions followed Arrhenius´ type equation, and the activation energies were in the range of 3.675-3.775 ㎉/g-㏖ that were near to that of pure water. The changes of reduced viscosity with concentration were followed Huggin´s equation and the values of intrinsic viscosity and interaction coefficient were 0.78-1.59 ㎗/g and 0.67-2.75, respectively.
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KEYWORD
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