Abstract: 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.

Key words: Low-concentration Xanthan gum Rheological propertied Viscosity