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KMID : 0380620010330020221
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Korean Journal of Food Science and Technology
2001 Volume.33 No. 2 p.221 ~ p.225
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Flow Properties of Red Flower Cabbage Pigment Solutions
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Lee Jung-Ju
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Abstract
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Flow properties of red flower cabbage pigment solutions were determined over a wide range of temperatures (20- 50℃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·sⁿ, 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/㏖ 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 In η_a=6.11 - 3103.94(1/T) - 0.03C.
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