Viscous Degradation of Acidic Chitosan Solutions and its Ionic Probe Study

Boyko, I. S.; Podkolodnaya, O. A.; Lysachok, S. G.; Shmakov, S. L.

doi:10.18500/1816-9775-2015-15-4-21-30

Cited by 1 publication

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“…CTS solutions are also characterized by instability of viscosity properties over time, which is usually explained by the destruction of macromolecules as a result of acid hydrolysis of glycosidic bonds [5][6][7]. However, there are studies that make it possible to exclude destruction as the main reason for the decrease in the viscosity of chitosan solutions in time [8,9] and to explain this effect by conformational rearrangements of macromolecules [10], changes in the supramolecular structure, including aggregation [9,11], and also by phase separation of the system as it is stored [11,12].…”

Section: Introductionmentioning

confidence: 99%

Kinetic instability of a chitosan – aspartic acid – water system as a method for obtaining nano- and microparticles

2021

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The specific electrical conductivity and dielectric constant of aqueous solutions of ionic aminopolysaccharide chitosan in L-aspartic acid were investigated. An increase of the mobility of charge carriers in these solutions was found in comparison with solutions of an individual acid. The evaluation of the kinetic stability revealed that the viscosity, electrical conductivity and dielectric constant of the chitosan – L-aspartic acid – water system decrease, while the pH value increases. It was shown that the time variation of physicochemical and electrochemical parameters is due to the effects of counterionic association with the transition of macromolecules to the ionomeric state and is accompanied by phase segregation of the polymer phase in the form of nano- and microparticles. The conducted studies carried out have shown the fundamental possibility of controlling the metastable state of this system in order to obtain nano- and microparticles.

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