Rheological properties of polysaccharide isolated from Ilex kudingcha C.J.Tseng

Effects of concentration, shear force, temperature, p H, freezing-thawing and addition of metallic ions on the apparent viscosity and viscoelasticity of polysaccharide isolated from Ilex kudingcha C.J.Tseng (ICP) were studied.The results showed that the aqueous ICP solution was a typical non-Newtonianfluid with good anti-degradation property.The p H value affected the apparent viscosity of ICP solution.Freeze-thawing had little effect on the apparent viscosity of ICP solution.However, the apparent viscosity decreased along with the increase of temperature and addition of metallic ions (Na⁺, K⁺and Mg²⁺) .The dynamic rheological results showed that the storage modulus G'hadchanged slightly within 100%strain rate, and the storage modulus G'were always higher than loss modulus G″.G'and G″decreased along with theaddition of metallic ions (Na⁺, K⁺, Mg²⁺and Ca²⁺) .These results suggested that concentration, temperatureand addition of metallic ions could affect the rheological property of ICP solution.