The gellan sol-gel transition

被引：63
|
作者：
Milas, M
Rinaudo, M
机构：
[1] Ctr. Rech. sur Les Macromolec. Veg., CERMAV-CNRS, 38041 Grenoble Cedex 9
来源：
CARBOHYDRATE POLYMERS | 1996年 / 30卷 / 2-3期
关键词：
D O I：
10.1016/S0144-8617(96)00090-2
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The behavior of gellan during the conformational transition is discussed. This transition corresponds to the formation of a double helix from two separate coils. The influence of the counterion activity on the melting and gelling temperatures of the gels and/or the ordered conformation is also described. The sol-gel transition is studied by conductimetry in the presence of pure monovalent counterions or monovalent divalent mixtures. This method is one of the best ways of characterizing this transition. A two-step mechanism of gelation was demonstrated in the presence of monovalent counterions. In the presence of divalent counterions, at a given ionic strength, the mechanism of gelation and the gel properties depend only on the ratio Y between divalent and monovalent counterions. Three types of gel behavior are described as a function of Y and ionic strength. Copyright (C) 1996 Elsevier Science Ltd
引用
收藏
页码：177 / 184
页数：8
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