黄原胶在低浓度时的流变特性及影响因素研究

Rheological Properties and Affecing Factors of Low-Concertration Xanthan Gum

以低浓度黄原胶溶液为研究对象，考察了其流变特性及浓度、温度、pH值和搅拌作用对溶液粘度的影响。结果表明当浓度≤0.10%时，黄原胶溶液呈牛顿流体，浓度>0.10%时为假塑性流体；不同温度和浓度的黄原胶溶液粘度符合指数律流变方程τ=KDn；低浓度的黄原胶溶液在pH5.0-9.5范围，粘度不受pH值变化的影响；搅拌作用使黄原胶溶液的粘度提高。

Xanthan gum, when used in soft-drink industry, was usually used in very low concentration. This paper studied the rheological propertied of low-concentration xanthan gum with different concentration, temperature, pH or stirring that would affect the viscosity of the gum solution. The results showed that it behaved like Newtonian fluid. When it抯 concentration was smaller than or equal to 0.10%, it became pseudo-plasticity fluid. The viscosity of xanthan gum solution was in accordance with rheological equation τ=KDn . The viscosity of low-concentration gum solution was constant when its pH value was in the range of 5.0-9.5. The viscosity increased with stirring action.