title: Chitosan-based membranes with different ionic crosslinking density for pharmaceutical and industrial applications.
abstract: Chitosan membranes (Ch), ionically crosslinked with pentasodium tripolyphosphate (TPP), were prepared using chitosan of medium and high molecular weight of similar degree of deacetylation and different crosslinking conditions. An effect of synthesis conditions (pH of crosslinking TPP solution equal to 5.5 and 9.0) on molecular and supermolecular structure and on crosslinking density of Ch/TPP membranes was confirmed using Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD) method and energy dispersive X-ray (EDX) spectrometry. Atomic-force microscopy (AFM) and contact angle measurements indicated some differences in membrane roughness and hydrophilicity. The state of water in non-crosslinked and ionically crosslinked Ch membranes containing different amount of water was investigated by low temperature differential scanning calorimetry (DSC) measurements. DSC analysis confirmed presence of freezing and non-freezing water in non-crosslinked and ionically crosslinked membranes. The amount of non-freezing water generally decreased after Ch crosslinking and was affected by crosslinking conditions and crosslinking density. Molecular weight of Ch had only slight influence on all characterized properties of ionically crosslinked membranes.
authors: Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina St. 7, 87-100 Toruń, Poland. Electronic address: mgd@chem.uni.torun.pl.
authors: Magdalena
authors: M
authors: Gierszewska
authors: Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina St. 7, 87-100 Toruń, Poland. Electronic address: jocz@chem.uni.torun.pl.
authors: Jadwiga
authors: J
authors: Ostrowska-Czubenko
mesh_terms: D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D007477:Ions / Q000737:chemistry; D008567:Membranes, Artificial; D011122:Polyphosphates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D003432:Cross-Linking Reagents; D007477:Ions; D008567:Membranes, Artificial; D011122:Polyphosphates; D014867:Water; D048271:Chitosan; C005692:triphosphoric acid
keywords: Chitosan; Ionic crosslinking density; Polymer membrane; State of water; Tripolyphosphate