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KMID : 0380619880200060850
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Korean Journal of Food Science and Technology
1988 Volume.20 No. 6 p.850 ~ p.855
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Effects of Defatting and Reincorporation with Fatty Acid on the Rheological Characteristics of Rice Starch .
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Oh Doo-Hwan
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Abstract
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Rheological propreties of defatted and 1% palmitic acid reincorporated rice starch solutions were investigated, comparing with nondefatted starch. Flow behavior of gelatinized starch solutions(3-7%) revealed pseudoplastic behavior with yield stress, but yield stress was decreased by defatting. Relationship between logarithmic consistency index and concentration of nondefatted starch solution was linear with single slope, but the slopes for defatted and reincorporated starch solutions were different at 3-5% and 5-7% starch concentration. The activation energies for 7% starch solutions were estimated to be 3.14-4.76 ㎉/g·㏖ and increased slightly by defatting. All thre starch solutions above 4% concentration exhibited hysteresis phenomena, but by defatting, humping phenomena was observed and thixotropic behavior were increased slightly.
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