Concentration regimes of solutions of levan polysaccharide from Bacillus sp.

被引：105

作者：

Arvidson, Sara A. ^{[1
]}

Rinehart, B. Todd ^{[1
]}

Gadala-Maria, Francis ^{[1
]}

机构：

[1] Univ S Carolina, Dept Chem Engn, Columbia, SC 29208 USA

来源：

CARBOHYDRATE POLYMERS | 2006年 / 65卷 / 02期

关键词：

levan; polysaccharide; intrinsic viscosity; specific viscosity; space occupancy; Bacillus sp; coil overlap parameter; critical concentration; dilute regime; semi-dilute regime; concentrated regime; concentration regimes;

D O I：

10.1016/j.carbpol.2005.12.039

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The theological proper-ties of aqueous solutions of levan polysaccharide from Bacillus sp. were studied at 20.0 degrees C over a wide range of concentrations. At low concentrations the solutions were Newtonian, becoming shear thinning at higher concentrations. The intrinsic viscosity of this levan was found to be 0.14 dL/g, which is close to that of other levans. However, whereas other polysaccharides exhibit up to three concentrations regimes (dilute, semi-dilute, and concentrated) in a double logarithmic plot of the specific viscosity versus space occupancy, this levan exhibits four distinct concentration regions, at least three of which are linear. To the best of our knowledge, this is the first report of a solution of any kind exhibiting more than three distinct regions in this type of plot. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：144 / 149

页数：6

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