| Full text | |
| Author(s): |
Bueno, Vania Blasques
[1]
;
Bentini, Ricardo
[1]
;
Catalani, Luiz Henrique
[1]
;
Siqueira Petri, Denise Freitas
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Carbohydrate Polymers; v. 92, n. 2, p. 1091-1099, FEB 15 2013. |
| Web of Science Citations: | 99 |
| Abstract | |
In this work xanthan chains were crosslinked by esterification reaction at 165 degrees C either in the absence or in the presence of citric acid. Higher crosslinking density was obtained using citric acid, as evidenced by its lower swelling degree. Tensiometry, a very precise and sensitive technique, was applied to study swelling rates and diffusion mechanisms of water, which was initially quasi-Fickian, controlled by wicking properties, changing to Fickian or Anomalous, depending on hydrogel composition. Hydrogels swelling degree increased at high pH values, due to electrostatic repulsion and ester linkages rupture. Equilibrium swelling degree was affected by salts, depending on gel composition and kind of salt. Effects could be explained by interaction between ions and polymeric chains, EPA/EPD ability of water or osmotic gradient. (C) 2012 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 10/13034-2 - Production of biodegradable scaffolds of polysaccharide hydrogel for cell growth |
| Grantee: | Vânia Aparecida Blasques Bueno Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |