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Dissolution of chitosan nanocrystals in aqueous media of different acidity. Molecular dynamic study

Author:
Naumov, Vladimir S., Ignatov, Stanislav K.
Source:
Carbohydrate polymers 2019 v.207 pp. 619-627
ISSN:
0144-8617
Subject:
acidity, chitosan, equations, hydrogen bonding, molecular weight, nanocrystals, pH, polymers, viscosity
Abstract:
The process of dissolution of chitosan nanocrystals with molecular mass of polymer up to 12.8 kDa in aqueous media of various pH was studied by molecular dynamic simulations with the use of the improved force field GROMOS 56ACARBO_CHT specially developed for the chitosan polymers description. The effect of the media acidity and polymer molecular weight on the dissolution process kinetics has been studied and the regression expressions for kinetic parameters were established. The calculated solution viscosity, Mark–Houwink–Sakurada equation parameters, and pH values of the dissolution beginning are in good agreement with the available experimental data. The uniform/non-uniform distribution of protonated amino groups and hydrogen bonds along the polymeric chains is found to be of key importance parameter for the dissolution process which can be considered as a criterion of dissolution ability.
Agid:
6258160