【摘要】 研究了温度、pH、变性剂(脲)及金属离子(Mg2+、Cu2+、Fe2+、Ca2+、Mn2+、Na+)对普鲁兰(Pull)溶液粘度的影响,发现在10～20℃时,Pull溶液的粘度略有增加,在20～70℃,其粘度基本保持不变;溶液的pH对Pull的粘度影响很小;变性剂会使Pull的粘度略有增加;而金属离子对Pull溶液的粘度有显著影响,其中Mg2+使Pull溶液的粘度增加最大,Na+的影响最小。分子量的测定表明,其粘度的增加是由于其分子量的增大造成的。更多还原

【Abstract】 The effects of temperature,pH,denaturant(urea)and metal ions on the viscosity of pullulan solution were studied.The viscosity of pullulan solution went up from 10℃ to 20℃,but was kept constant between 20℃ and 70℃.The pH of thesolution showed little effect on the viscosity and denaturant results in increase of the viscosity of pullulan solution slightly.However,metal ions could increase the viscosoity of pullulan solution obviously,among which the effect of Mg2+ was thegreatest and Na+ the least.The enhancement of the viscosity of pullulan solution was proved to be the result of the incrementof molecular weight.更多还原