|
KMID : 1007520010100030294
|
|
Food Science and Biotechnology
2001 Volume.10 No. 3 p.294 ~ p.298
|
|
|
Rheological Characteristics of Hot - Water Extract Concentrates from Agastache rugosa O. Kuntze
|
|
Lee, Hyeong Kyu
Oh, Se Ryang/Lee, Boo Yong/Choi, Hyeon Son
|
|
|
Abstract
|
|
|
|
To provide fundamental data for food processing and materialization of Agastache rugosa O. Kuntze, flow properties of the hot-water extract concentrates were determined over a broad range of temperatures (10-60℃) and soluble solid concentrations (1-50°Brix) using a rotational cylindrical viscometer. Flow properties of the hot-water extract concentrates were suitably described by power law model and Herschel-Bulkley model and exhibited a pseudoplastic behavior. The flow behavior index (n) and consistency index (K) of hot-water extract concentrates by power law model were in the ranges of 0.7173-0.9151 and 0.0059-0.1607 Pa·sⁿ, respectively. The maximum value of yield stress was 0.9695 Pa of 50°Brix concentrates at 10℃. The effect of concentration and temperature on the apparent viscosity of hot-water extract concentrates followed an Arrhenius equation. B (concentration dependency constant) value decreased from 0.0510 to 0.0436 with increasing of temperature. E_a (activation energy for flow) increased from 1.3164 to 2.1896×10⁴kJ/㏖·㎏ with increasing concentration ( 150°Brix) of hot-water extract concentrates.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|