title: The influence of UV-irradiation on chitosan modified by the tannic acid addition.
abstract: The influence of UV-irradiation with the wavelength 254 nm on the properties of chitosan modified by the tannic acid addition was studied. Tannic acid was added to chitosan solution in different weight ratios and after solvent evaporation thin films were formed. The properties of the films such as thermal stability, Young modulus, ultimate tensile strength, moisture content, swelling behavior before and after UV-irradiation were measured and compared. Moreover, the surface properties were studied by contact angle measurements and by the use of atomic force microscopy. The results showed that UV-irradiation caused both, the degradation of the specimen and its cross-linking. The surface of the films made of chitosan modified by the addition of tannic acid was altered by UV-irradiation.
authors.affiliation: Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Chemistry of Biomaterials and Cosmetics, Gagarin 7 street, 87-100 Toruń, Poland. Electronic address: as@chem.umk.pl.
authors.forename: A
authors.initials: A
authors.lastname: Sionkowska
authors.affiliation: Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Chemistry of Biomaterials and Cosmetics, Gagarin 7 street, 87-100 Toruń, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Kaczmarek
authors.affiliation: Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Chemistry of Biomaterials and Cosmetics, Gagarin 7 street, 87-100 Toruń, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Gnatowska
authors.affiliation: Nicolaus Copernicus University in Torun, Faculty of Chemistry, Department of Chemistry of Biomaterials and Cosmetics, Gagarin 7 street, 87-100 Toruń, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Kowalonek
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry / Q000528:radiation effects*; D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000737:chemistry*; D055119:Elastic Modulus; D018625:Microscopy, Atomic Force; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013634:Tannins / Q000737:chemistry*; D013718:Tensile Strength; D014466:Ultraviolet Rays
chemical_list: D001672:Biocompatible Materials; D013634:Tannins; D048271:Chitosan
keywords: Biomaterials; Chitosan; Tannic acid; UV-irradiation