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KMID : 0380619870190020081
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Korean Journal of Food Science and Technology
1987 Volume.19 No. 2 p.81 ~ p.88
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Rheological Properties of Rehydrated Suspensions of Freeze Dried Kochujang Powders
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이상규/Lee, Sang Kyu
이신영/윤한교/김석신/장규섭/Lee, Shin Young/Yoon, Han Kyo/Kim, Suk Shin/Chang, Kye Seob
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Abstract
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Rheological properties of rehydrated suspensions of two kinds of freeze dried Kochujang powders, processed at different freezing rates, were compared with raw Kochujang using Brookfield wide-gap rotational viscometer at 25℃-60℃. Shear rates ranged from 0.1965 sec^(-1) to 1.9650 sec^(-1) and solid content ranged from 47% to 56%. Rehydrated suspensions of quickly frozen Kochujang powder and slowly frozen Kochujang powder, and raw Kochujang exhibited pseudoplastic behaviors with yield stress and presented thixotropic properties which followed the second-order kinetic behavior proposed by Tiu. Suspensions of Kochujang powders exhibited considerably higher decaying rates than raw Kochujang. The dependency of the equilibrium structure parameter on the shear rate was weak, and there were no significant differences among the values of structure parameters of three samples. The temperature dependency of the apparent viscosity of Kochujang suspension was fully expressed by Arrhenius equation and activation energies of suspensions of quickly frozen Kochujang powder and slowly frozen Kochujang powder, and raw Kochujang were 2.21, 2.18, and 2.32 Kcal/.mole respectively. Consistency indices of three samples increased with solid content and decreased with temperature. Flow behavior indices of three samples showed no considerable dependency on the temperature and solid content. There were no significant differences in the rheological properties between two Kochujang powders.
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KEYWORD
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