Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/320069
Type: Artigo de Periódico
Title: Effects Of Supercritical Carbon Dioxide Processing On The Properties Of Chitosan-alginate Membranes
Author: Bueno
CZ; Moraes
AM; de Sousa
HC; Braga
MEM
Abstract: 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.
Subject: Chitosan-alginate Membranes
Biopolymers
Supercritical Co2 Processing
Biomedical Applications
Editor: ELSEVIER SCIENCE BV
Citation: The Journal Of Supercritical Fluids. ELSEVIER SCIENCE BV, n. 112, p. 128 - 135.
Rights: fechado
Identifier DOI: 10.1016/j.supflu.2015.10.001
Address: http://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S0896844615301479
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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