Flow Properties of Red Flower Cabbage Pigment Solutions

꽃양배추 색소 추출액의 유동특성

  • Rhim, Jong-Whan (Department of Food Engnieering, Mokpo National University) ;
  • Lee, Jung-Ju (Department of Food Engnieering, Mokpo National University)
  • 임종환 (목포대학교 식품공학과) ;
  • 이정주 (목포대학교 식품공학과)
  • Published : 2001.04.30

Abstract

Flow properties of red flower cabbage pigment solutions were determined over a wide range of temperatures ($20-50^{\circ}C$) and soluble solid concentrations (1-65%) using a cone and plate rotational viscometer. Flow properties of the pigment solutions were adequately described by the simple power law model. Within the tested ranges of concentration, temperature and shear rate, the flow behavior index (n) and the consistency index (K) of the solutions were in the ranges of 0.841-0.998 and $0.008-31.525\;Pa{\cdot}s^n$, respectively. The effect of temperature on the apparent viscosity of the solutions followed an Arrhenius type relationship. Activation energy of flow varied from 9.36 to 52.48 kJ/mol depending on the solid concentration and shear rate. The combined effect of temperature and concentration on the apparent viscosity at the shear rate of $100\;s^{-1}$ could be represented by a single equation as ${\ln}\;{\eta}_a\;=\;6.11\;-\;3103.94(1/T)\;-\;0.03C$.

Keywords

red flower cabbage;pigment solution;flow properties;pseudoplastic behavior