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KMID : 0380619920240060597
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Korean Journal of Food Science and Technology
1992 Volume.24 No. 6 p.597 ~ p.602
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Rheological Properties of Hot - Water Extractable Concentrates of Boxthorn(Lycii Fructus) and Mixed Boxthorn
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박무현/Park, Moo Hyun
김철진/이부용/김흥만/Kim, Chul Jin/Lee, Boo Yong/Kim, Heung Man
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Abstract
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To improve utilization of boxthorn (Lycii Fructus), the boxthron and mixed boxthron (Lycii Fructus, Schizandrae Fructus, Corni Fructus, Zizyphi Fructus, Zingiberis Rhizoma, Cinnamami Cortex) hot-water extractable concentrates were prepared by vaccum evaporation and its rheological properties were investigated. The rheological properties of concentrates (20∼50°Bx) followed power low model and showed a pseudoplastic behavior at the temperature range of 20∼60℃ . The apparent viscosity of 20°Bx, 30°Bx, 40°Bx and 50°Bx boxthron hot-water extractable concentrate was 0.0074 Pa s, 0.0175 Pa, 0.0431 Pa´s and 0.0988 Pa´s, that of mixed boxthorn hot-water extractable concentrate was 0.0099 Pa s, 0.0328 Pa s, 0.0720 Pa s and 0.1940 Pa s at 20 ℃ and 1500 1/s, respectively. The yield stress of boxthron and mixed boxthron hot-water extractable concentrates ranged from 0.045 to 6.253 Pa and from 0.022 to 8.891 Pa, respectively. The activation energy for the flow of boxthron and mixed boxthorn hot-water extractable concentrates increased from 1.6182 to 2.0543 × 10^7 J/kg·mol and from 1.7057 to 2.1462 × 10^7 J/kg·mol with the concentrations of concentrates, respectively.
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KEYWORD
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