The gellan sol-gel transition

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 descr...

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Bibliographic Details
Published in:Carbohydrate polymers 1996, Vol.30 (2), p.177-184
Main Authors: Milas, M., Rinaudo, M.
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
characterization
Exact sciences and technology
Food additives
Food industries
Fundamental and applied biological sciences. Psychology
gel properties
gelation
General aspects
ionic strength
Natural polymers
Physicochemistry of polymers
polysaccharides
Starch and polysaccharides
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Summary: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.
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(96)00090-2