| Texto completo | |
| Autor(es): |
Bueno, Vania Blasques
[1]
;
Bentini, Ricardo
[1]
;
Catalani, Luiz Henrique
[1]
;
Siqueira Petri, Denise Freitas
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Carbohydrate Polymers; v. 92, n. 2, p. 1091-1099, FEB 15 2013. |
| Citações Web of Science: | 99 |
| Resumo | |
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) | |
| Processo FAPESP: | 10/13034-2 - Produção de suportes biodegradáveis de hidrogel de polissacarídeos para crescimento celular |
| Beneficiário: | Vânia Aparecida Blasques Bueno Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |