Artículos de revistas
Effects Of Supercritical Carbon Dioxide Processing On The Properties Of Chitosan-alginate Membranes
Registro en:
1872-8162
The Journal Of Supercritical Fluids. ELSEVIER SCIENCE BV, n. 112, p. 128 - 135.
0896-8446
WOS:000374078100017
10.1016/j.supflu.2015.10.001
Autor
Bueno
CZ; Moraes
AM; de Sousa
HC; Braga
MEM
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Chitosan alginate membranes with different porosities designed to be used as wound dressings or scaffolds were processed in supercritical CO2 (scCO(2)) with the aim of improving their physicochemical properties. The membranes were characterized before and after processing at 100 or 300 bar and 45 degrees C for 2 h with a depressurization rate of 5 bar/min. The results show that after processing, thickness, real density and porosity increased up to 68%, 100% and 167%, respectively, and surface area decreased up to 47%. Because of changes in structure, water vapor sorption and permeability increased up to 53% and 84%, respectively. Stabilization of the chitosan alginate complex was noticed after processing with scCO(2) according to thermal analysis. The results indicate that supercritical CO2 processing made the membranes more adequate for use as wound dressings. (C) 2015 Elsevier B.V. All rights reserved. 112
128 135 Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), Brazil Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES), Brazil Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil Fundacao para a Ciencia e a Tecnologia (FCT) from Portugal Programa Iberoamericano de Ciencia y Tecnologia para el Desarrollo (CYTED) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)