Viscometric study of chitosan solutions in acetic acid/sodium acetate and acetic acid/sodium chloride

Carbohydrate Polymers
Cristiane N CostaMarcos A S Costa

Abstract

A viscometric study was carried out at 25°C to assess the physical-chemical behavior in solution and the mean viscometric molar mass (M¯v) of chitosan solutions with different deacetylation degrees, in two solvent mixtures: medium 1-acetic acid 0.3mol/L and sodium acetate 0.2mol/L; and medium 2-acetic acid 0.1mol/L and sodium chloride 0.2mol/L. Different equations were employed, by graphical extrapolation, to calculate the intrinsic viscosities [η] and the viscometric constants, to reveal the solvent's quality: Huggins (H), Kraemer (K) and Schulz-Blaschke (SB). For single-point determination, the equations used were SB, Solomon-Ciuta (SC) and Deb-Chanterjee (DC), resulting in a faster form of analysis. The values of ̄M¯v were calculated by applying the equation of Mark-Houwink-Sakurada. The SB and SC equations were most suitable for single-point determination of [η] and ̄M¯v and the Schulz-Blachke constant (kSB), equal to 0.28, already utilized for various systems, can also be employed to analyze chitosan solutions under the conditions studied.

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Citations

Jan 10, 2019·Pharmaceutics·Raúl Cazorla-LunaMaría Dolores Veiga
May 13, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Jin-Ning LiangNa-Ru Zhao
Nov 6, 2018·The Journal of Chemical Physics·Nir KampfJacob Klein
Jan 9, 2021·Journal of Hazardous Materials·Ismaila Olalekan SaheedFaiz Bukhari Mohd Suah
Jan 22, 2020·International Journal of Biological Macromolecules·Wen QiuGang Yu
Nov 26, 2019·Materials Science & Engineering. C, Materials for Biological Applications·Pritam DasPatrice Bacchin
Nov 15, 2019·International Journal of Biological Macromolecules·Evgeniya A BezrodnykhVladimir E Tikhonov

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