title: [The preparation and properties of Modified silk fibroin membranes by chitosan].
abstract: The Modified silk fibroin membranes were prepared by mixing the aqueous solutions of both silk fibroin and chitosan with the use of oxidized glucose aldehyde as a crosslinking agent. It was characterized by FTIR, DSC, measurements of membrane-potential and mechanical properties, the water swelling ratios and permeability coefficient for model drug 5-Fu in the different pH buffer solutions. It was shown that there were some strong hydrogen bond interaction and good compatibility between silk fibroin and chitosan molecules in the modified silk fibroin films. The isoelectric point of modified fibroin film was about pH 5.35, but that of natural fibroin film was around pH 4.5. It was also found that the mechanical properties of modified fibroin films were much better than those of fibroin itself. Its tensile strength and breaking elongation were greatly enhanced with the increase of chitosan content and their maximum values were as high as 71.4-72.7 MPa and 2.96%-3.82% respectively, at the composition of 40 wt%-60 wt% chitosan. Its coefficient of permeability decreased firstly and then increased slowly with the change of the pH value of solutions from pH 5 to pH 9, and the minimum coefficient of permeability was observed when pH=7.
authors.affiliation: Department of Chemistry, Zhejiang Shaoxing Arts and Sciences College, Shaoxing 312000, China. keke-liu@hotmail.com
authors.forename: Liping
authors.initials: L
authors.lastname: Liu
authors.forename: Zezhi
authors.initials: Z
authors.lastname: Wu
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Shaoxi
authors.initials: S
authors.lastname: Cai
authors.forename: Xiouli
authors.initials: X
authors.lastname: Chen
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004337:Drug Carriers / Q000138:chemical synthesis*; D005338:Fibrin Fibrinogen Degradation Products; D005349:Fibroins / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008566:Membranes; D047011:Silk / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D005338:Fibrin Fibrinogen Degradation Products; D047011:Silk; D005349:Fibroins; D048271:Chitosan