title: [Comparative study of the physico-chemical properties of chitosans with varying degree of polymerization in neutral aqueous solutions].
abstract: The physicochemical properties of chitosan samples with high (130 kD) and low (30 kD) molecular masses in neutral aqueous solutions (pH 6.0) were studied by the methods of high-speed and equilibrium sedimentation, viscosimetry, and NMR and UV spectroscopies. Differences in the hydrodynamic characteristics of the samples were revealed. It was found that low-molecular-weight chitosan represents flexible linear macromolecules which undergo conformational changes upon temperature increase. The high-molecular-weight chitosan forms more rigid asymmetric structures whose conformation does not vary significantly with temperature increase. It was found that the high-molecular-weight chitosan has a higher constant of binding to the anionic dye tropeoline 000-II, which can be explained by different conformations of their macromolecules in solution.
authors.affiliation: Pacific Institute of Bioorganic Chemistry, Far East Division, Russian Academy of Sciences, Vladivostok, Russia.
authors.forename: V N
authors.initials: VN
authors.lastname: Davydova
authors.forename: I M
authors.initials: IM
authors.lastname: Ermak
authors.forename: V I
authors.initials: VI
authors.lastname: Gorbach
authors.forename: A L
authors.initials: AL
authors.lastname: Drozdov
authors.forename: T F
authors.initials: TF
authors.lastname: Solov'eva
mesh_terms: D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry*; D048271:Chitosan; D009682:Magnetic Resonance Spectroscopy; D008854:Microscopy, Electron; D008970:Molecular Weight; D011108:Polymers / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D011108:Polymers; D014867:Water; D002686:Chitin; D048271:Chitosan