Abstract
The structures of low-molecular-weight chitosan oligomers and their two nitroxide derivatives were examined using the force field molecular dynamics (MD) and density functional theory calculations with implicit and explicit solvent models. Rotamers of both neutral oligomers and those protonated at amino group were determined and the influence of the chain length and solvent (water) on their stability was studied. Bent conformations of the chitosan chain were found to be the most stable in the gas phase, whereas a linear structure of the polysaccharide is more preferred in water. Conformational transitions between the bent structures can occur only via the linear conformation of chitosan. According to the MD calculations, the nitroxides linked at the amino group do not form intramolecular hydrogen bonds with polar groups of the polysaccharide. The nitroxide substituents enhance the conformational flexibility of chitosan, but the linear conformation of the substituted oligomers remains most populated in water.
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The authors express their gratitude to the staff of Computing Center at the Institute of Problems of Chemical Physics, Russian Academy of Sciences, for help in performing calculations.
This work was carried out within the framework of the State Assignment Theme No. AAAA-A19-119071890015-6.
This paper does not contain descriptions of studies on animals or humans.
The authors declare no competing interests.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1523–1532, August, 2021.
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Krapivin, V.B., Luzhkov, V.B. Molecular modeling of the conformational dynamics of nitroxide derivatives of chitosan in aqueous solution. Russ Chem Bull 70, 1523–1532 (2021). https://doi.org/10.1007/s11172-021-3247-7
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DOI: https://doi.org/10.1007/s11172-021-3247-7