Phase diagram of the system sodium alginate/water: A model for biofilms

被引：32

作者：

Borchard, W ^{[1
]}

Kenning, A ^{[1
]}

Kapp, A ^{[1
]}

Mayer, C ^{[1
]}

机构：

[1] Univ Duisburg Gesamthsch, Inst Chem, D-47057 Duisburg, Germany

来源：

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2005年 / 35卷 / 05期

关键词：

sodium alginate; state diagram of polyelectrolyte/water; eutectic temperature; demixing; freezing point depression; swelling curve;

D O I：

10.1016/j.ijbiomac.2005.02.006

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Sodium alginate is a polyelectrolyte consisting of the monomer units beta-D-mannuronate and alpha-L-guluronate. Mainly based on the theory of Khokhlow et al., the state diagram of the binary system alginate/water has been calculated using different sets of parameters like degree of ionization, degree of polymerization and interaction function. The calculations comprise miscibility gaps, liquidus curves, eutectic points and the behaviour at temperatures below the melting point of water. Also gel and swelling curves have been treated, where gels are physically crosslinked. The DSC diagram of a 0.5 by wt.% polymer sot shows a double melting peak, which is explained by a heterogeneity above 0 degrees C. The crystallization of water seems to concentrate the gelled system irreversibly. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：247 / 256

页数：10