Journal
CARBOHYDRATE POLYMERS
Volume 103, Issue -, Pages 472-479Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.12.084
Keywords
DBD plasma; Chitosan; In situ gelation; Hydrogels; Swelling
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Funding
- Consejo Superior de Investigaciones Cientificas [PIE 2009801119]
- Catalan Agency for University and Research Grants [2010 PIV 00024]
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This work reports on the feasibility of atmospheric dielectric barrier discharge (DBD) plasma as a novel synthetic pathway for the liquid phase gelation of chitosan. The DBD plasma chitosan gelation process did not significantly alter the chemical structure of the biopolymer as confirmed by FTIR study. However, the oxidation processes and local heating effect associated with the solvent evaporation during the plasma treatment could provoke both reaction of chitosan degradation and the cleavage of beta-1-4-glycosidic linkages with the concomitant generation of aldehyde groups able to crosslink via Schiff-base with amino groups from other chitosan molecules. Shear viscosity measurements suggested the formation of chitosan fragments of lower molecular weight after the plasma treatment of 1% (w/v) chitosan and fragments of higher molecular weight after the plasma treatment of 2% (w/v) chitosan. The crosslinking density of hydrogels generated during the in situ DBD plasma chitosan gelation process increased as a function of the treatment time and concentration of chitosan. As of consequence of the increase of the cross-linking density, the equilibrium swelling ratio and water content decreased significantly. (C) 2014 Elsevier Ltd. All rights reserved.
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