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KMID : 0380619840160010029
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Korean Journal of Food Science and Technology
1984 Volume.16 No. 1 p.29 ~ p.36
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Flow Behaviors of Native and Gelatinized Rice Starch Solutions
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이상규/Lee, Sang Kyu
변유량/유주현/이신영/조형용/Pyun, Yu Ryang/Yu, Ju Hyun/Lee, Shin Young/Cho, Hyung Yong
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Abstract
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Flow behaviors of rice starch-water systems containing 3-9% (w/v) of native and gelatinized starch solutions were studied with the capillary tube rheometer in the temperature range of 30-80℃. Flow behaviors of rice starch-water systems showed non-Newtonion behavior which could be expressed as φ(^τg_c-^τ_yg_c)^N. Flow parameters φ, N and ^τy were determined for native and gelatinized solutions. These parameters indicated that native rice starch solution shows a dilatancy and the gelatinized solution ranges from pseudoplastic to mixed type flow behavior with increasing concentrations. The value of flow behavior index for gelatinized solutions was about 1.2 in all samples but for native solutions, the values were 0.87-0.90. The values of yield stress, which were negligible below 5%, were increased with the increase in concentration from 5 to 9%. The value of consistency index was exponentially dependent on concentration and temperature. The values of activation energy for native and gelatinized solutions were 0.13-2.71 and 5.39-9.57 ㎉/g mole, respectively.
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