卡拉胶溶液在低浓度时的流变性能及其影响因素研究

以低浓度卡拉胶溶液为研究对象,考察了其流变性能及浓度、剪切速率、温度、pH值、搅拌时间对溶液黏度的影响。结果表明,低浓度卡拉胶溶液的黏度随浓度的增大而增加;溶液呈现假塑性,表现出剪切稀化的特点;其黏度先随温度的升高逐步上升,当温度升高到一定程度时,溶液黏度开始下降;在酸性条件下(pH<5.0)其黏度随pH的增大而下降,在接近中性时基本稳定,随后又下降;低浓度卡拉胶溶液在不同的搅拌时间作用下具有不同的黏度。

Study on the rheology and the influence factor of low-concentration carrageenan

This paper studied the rheological properties of low-concentration carrageenan with different concentration, shearing rate, temperature, pH or stirring time that would affect the viscosity of gum solution. The results showed the viscosity of low-concentration carrageenan was increased with concentration. It became pseudo-plasticity fluid and its viscosity was fluctuated with temperature. At low concentration, the viscosity of carrageenan solution was distinct increased when its pH value was under 5.0, the viscosity of low-concentration gum solution was constant when its pH value in range of 5.0~10.0 and its viscosity was gradually reduced when its pH value up 10.0. The viscosity was influenced with different stirring action.