苦丁茶冬青多糖流变学特性研究

朱科学; 赵书凡; 朱红英; 唐冰; 贺书珍; 谭乐和

doi:10.13386/j.issn1002-0306.2017.22.013

苦丁茶冬青多糖流变学特性研究

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

摘要

摘要: 以苦丁茶冬青多糖（ICP）为对象,研究浓度、剪切力、温度、p H、冻融变化和盐离子浓度等因素对ICP溶液表观粘度和粘弹性的影响。结果显示,ICP溶液表现出"非牛顿流体"特性,具有良好的抗降解性能;ICP多糖溶液的表观粘度随p H的变化而变化;冷藏和冷冻对ICP溶液的粘度基本无影响,ICP溶液的粘度随着温度的升高而下降;高浓度的Na⁺、K⁺、Mg²⁺和Ca²⁺四种盐离子可使ICP溶液的粘度明显下降。华体会（中国）流变实验结果显示,应变控制在100%以内时,ICP的弹性储能模量G’基本没有变化,ICP溶液的储能模量G’始终大于损耗模量G″,表现出凝胶特性,且G’和G″随Na⁺、K⁺和Mg²⁺的添加呈降低趋势。因此,ICP溶液的流变特性受浓度、温度、盐离子等因素的影响。

Abstract: 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.