食品科学 ›› 2009, Vol. 30 ›› Issue (7): 68-71.doi: 10.7506/spkx1002-6630-200907015

• 基础研究 • 上一篇    下一篇

葡聚糖水溶液流变性研究

徐学林1,励杭泉2   

  1. 1. 中国计量科学研究院
    2.北京化工大学材料科学与工程学院
  • 收稿日期:2008-06-05 修回日期:2008-08-29 出版日期:2009-04-01 发布日期:2010-12-29
  • 通讯作者: 徐学林 E-mail:xuxl@nim.ac.cn

Rheological Properties of Aqueous Dextran Solution

XU Xue-lin1 LI Hang-quan2   

  1. (1.National Institute of Metrology, Beijing 100013, China 2. College of Materials Science and Engineering, Beijing University of
    Chemical Technology, Beijing 100029, China)
  • Received:2008-06-05 Revised:2008-08-29 Online:2009-04-01 Published:2010-12-29
  • Contact: XU Xue-lin1 E-mail:xuxl@nim.ac.cn

摘要:

本实验研究了葡聚糖水溶液的流变性能,选取了五种不同分子量的葡聚糖,分别考查了分子量、溶液浓度、溶液温度等因素对葡聚糖水溶液流变性的影响。结果显示,多数葡聚糖水溶液表现出牛顿流体的特性,而当葡聚糖分子量为531000,溶液浓度为30%时,溶液则表现出假塑性流体的性质,黏度随着剪切速率的提高而降低。当葡聚糖浓度较低时(≤1%),水溶液均表现出一种特殊的流变性,即黏度随着剪切速率增加先降低后升高,本研究对出现这一现象的原因进行了分析。

关键词: 葡聚糖, 水溶液, 流变性, 牛顿流体, 假塑性流体

Abstract:

The rheological properties of five dextrans with various molecular weights in aqueous solution were investigated as well as the effects of molecular weight (Mw), concentration of solution and temperature. Results indicated that the solution with a molecular weight of 531000 and a concentration of 30% shows pseudo-plastic property, but most aqueous dextran solutions are Newtonian fluid. The viscosity decreases with the increase of shear rate. When the concentration is lower than 1%, the dextran solutions show unique rheological properties, i.e., with the increase of shear rate, the viscosity of solution firstly decreases and then increases.

Key words: dextran, aqueous solution, rheology, Newtonian fluid, pseudo-plastic fluid

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