Effects of supercritical carbon dioxide processing on the properties of chitosan–alginate membranes
Cecilia Zorzi Bueno, Ângela Maria Moraes, Hermínio C. de Sousa, Mara Elga Medeiros Braga
ARTIGO
Inglês
Chitosan–alginate membranes with different porosities designed to be used as wound dressings or scaffolds were processed in supercritical CO2 (scCO2) with the aim of improving their physicochemical properties. The membranes were characterized before and after processing at 100 or 300 bar and 45 °C...
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Chitosan–alginate membranes with different porosities designed to be used as wound dressings or scaffolds were processed in supercritical CO2 (scCO2) with the aim of improving their physicochemical properties. The membranes were characterized before and after processing at 100 or 300 bar and 45 °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 scCO2 according to thermal analysis. The results indicate that supercritical CO2 processing made the membranes more adequate for use as wound dressings
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COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Fechado
Effects of supercritical carbon dioxide processing on the properties of chitosan–alginate membranes
Cecilia Zorzi Bueno, Ângela Maria Moraes, Hermínio C. de Sousa, Mara Elga Medeiros Braga
Effects of supercritical carbon dioxide processing on the properties of chitosan–alginate membranes
Cecilia Zorzi Bueno, Ângela Maria Moraes, Hermínio C. de Sousa, Mara Elga Medeiros Braga
Fontes
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The journal of supercritical fluids Vol. 112 (June, 2016), p. 128-135 |