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KMID : 1007520030120010088
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Food Science and Biotechnology
2003 Volume.12 No. 1 p.88 ~ p.91
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Effect of Extracting Condition on Rheological Behaviors of Korean Red Ginseng Extract
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Yoo, Byoungseung
Choi, Yun-Hee/Lee, Sang-Yoon
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Abstract
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Korean red ginseng extract samples with an equal total solid (65% TS) were prepared at different ethanol concentrations in the range of 0-90%. The rheological behaviors of ginseng extracts were evaluated in steady and dynamic shear as a function of ethanol concentration. Ginseng extracts prepared with ethanol (ethanol concentration; 30-90%) as solvent showed a very low shear-thinning flow behavior (n=0.902-0.958) with low consistency index (K=0.59-2.14 Pa·s^n) and apparent viscosity (η_(a,100)) at 25℃. Over the temperature range of 15-45℃, the magnitudes of K and η_(a,100) decreased with temperature. Magnitudes of K and η_(a,100) from 70% ethanol were slightly higher than those from 50% and 90% ethanol. The apparent viscosity obeyed the Arrhenius temperature relationship; the activation energies for flow of ginseng extracts were in the range of 60.5-98.1 kJ/mol. Ginseng extracts displayed liquid-like behavior, with loss modulus (G") much greater than storage modulus (G´), showing the high dependence on frequency (ω). Magnitudes of G´ from 70% ethanol were slightly higher than those from 50% and 90% ethanol.
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