[Comparative study of the physico-chemical properties of chitosans with varying degree of polymerization in neutral aqueous solutions].
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.
Davydova
V N
VN
Pacific Institute of Bioorganic Chemistry, Far East Division, Russian Academy of Sciences, Vladivostok, Russia.
Ermak
I M
IM
Gorbach
V I
VI
Drozdov
A L
AL
Solov'eva
T F
TF
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
D011108:Polymers; D014867:Water; D002686:Chitin; D048271:Chitosan