Effect of Cross-Linking with Calcium Ions on the Physical Properties of Alginate Films

Three films of sodium alginate, with different amounts of guluronic fraction, were investigated with different techniques. On increasing the fraction of guluronic units the chain-to-chain interaction was promoted. The three samples were ionically cross-linked with calcium ions by soaking the films i...

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Bibliographic Details
Published in:Biomacromolecules 2007-10, Vol.8 (10), p.3193-3197
Main Authors: Russo, R, Malinconico, M, Santagata, G
Format: Article
Language:English
Subjects:
Alginates - chemistry
Applied sciences
Biocompatible Materials - chemistry
Calcium - chemistry
Calcium Chloride - chemistry
Calorimetry, Differential Scanning
Chemistry, Physical - methods
Cross-Linking Reagents - pharmacology
Exact sciences and technology
Glucuronic Acid - chemistry
Hexuronic Acids - chemistry
Ions
Materials Testing
Natural polymers
Permeability
Physicochemistry of polymers
Starch and polysaccharides
Stress, Mechanical
Temperature
Thermogravimetry - methods
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Summary:Three films of sodium alginate, with different amounts of guluronic fraction, were investigated with different techniques. On increasing the fraction of guluronic units the chain-to-chain interaction was promoted. The three samples were ionically cross-linked with calcium ions by soaking the films in a solution of calcium chloride. The introduction of the cross-linking points caused an appreciable change in the physical properties, and the results were discussed in terms of different composition of the materials and in terms of the increased free volume during the cross-linking process.
ISSN:1525-7797
1526-4602
DOI:10.1021/bm700565h