Complexation of chitosan with acetic acid according to Fourier transform Raman spectroscopy data

Mikhailov, G.P.; Tuchkov, S. V.; Лазарев, В. В.; Kulish, E. I.

doi:10.1134/s0036024414060181

Cited by 20 publications

(11 citation statements)

References 3 publications

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“…It would seem this increase also indicates the formation of ion pairs during the complexing of the CTS polycation with dodecyl sulfate ions. This agrees with the data from the Fourier spectroscopy of Raman scattering on the complexing of CTS macromolecules with acetate ions [12].…”

Section: Resultssupporting

confidence: 90%

“…Calculations were performed for a monomer unit of protonated chitosan (CTS + ); to neutralize its charge during calculations, а chloride ion was added to the protonated group. The thermodynamic characteristics of complexing between the protonated monomer CTS unit and an SDS ion were determined as the difference between the sum of the enthalpy and Gibbs energy of the [CTS + ⋅ C 12 The structure of the model complex of a protonated CTS monomer with an SDS ion is shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

“…In [12], CTS complexing with acetate ions in solutions of acetic acid was studied via Raman scattering (RS) and quantum-chemical simulations. It was shown that the complexing of protonated CTS macromolecules with acetate ions is apparent in the RS spectrum as a band at 934 сm −1 , indicating the formation of ion pairs [CTS + ⋅ CH 3 OСOО -].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of the complexing of chitosan with sodium dodecyl sulfate, according to IR spectroscopy data and quantum-chemical calculations

Shilova

Романова

Galyametdinov

et al. 2016

Russ. J. Phys. Chem.

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The complexing of protonated chitosan with dodecyl sulfate ions in water solutions is studied using IR spectroscopy data and quantum-chemical calculations. It is established that the electrostatic interaction between the protonated amino groups of chitosan and dodecyl sulfate ions is apparent in the IR spectrum as a band at 833 cm −1 . The need to consider the effect the solvent has on the formation of hydrogen-bound ion pairs [CTS + ⋅ C 12 H 25 ] is shown via a quantum-chemical simulation of the equilibrium geometry and the energy characteristics of complexing and hydration.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of the complexing of chitosan with sodium dodecyl sulfate, according to IR spectroscopy data and quantum-chemical calculations

Shilova

Романова

Galyametdinov

et al. 2016

Russ. J. Phys. Chem.

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“…Although, CHT particulates preserve their spherical morphology, while elongated filiform structures were also noticed in the blended regions of the film (i.e., S2-S4). It was stated that these threadlike structures could support some toughness improvements similar to the one provided by fibre reinforcing in the composite materials, ensuring the desired mechanical behavior for tissue substitution (Mikhailov et al, 2014).…”

Section: Sem Afm and Eds Observationsmentioning

confidence: 99%

Combinatorial MAPLE deposition of antimicrobial orthopedic maps fabricated from chitosan and biomimetic apatite powders

Visan

Stan

Ristoscu

et al. 2016

International Journal of Pharmaceutics

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Chitosan/biomimetic apatite thin films were grown in mild conditions of temperature and pressure by Combinatorial Matrix-Assisted Pulsed Laser Evaporation on Ti, Si or glass substrates. Compositional gradients were obtained by simultaneous laser vaporization of the two distinct material targets. A KrF* excimer (λ=248nm, τFWHM=25ns) laser source was used in all experiments. The nature and surface composition of deposited materials and the spatial distribution of constituents were studied by SEM, EDS, AFM, GIXRD, FTIR, micro-Raman, and XPS. The antimicrobial efficiency of the chitosan/biomimetic apatite layers against Staphylococcus aureus and Escherichia coli strains was interrogated by viable cell count assay. The obtained thin films were XRD amorphous and exhibited a morphology characteristic to the laser deposited structures composed of nanometric round shaped grains. The surface roughness has progressively increased with chitosan concentration. FTIR, EDS and XPS analyses indicated that the composition of the BmAp-CHT C-MAPLE composite films gradually modified from pure apatite to chitosan. The bioevaluation tests indicated that S. aureus biofilm is more susceptible to the action of chitosan-rich areas of the films, whilst the E. coli biofilm proved more sensible to areas containing less chitosan. The best compromise should therefore go, in our opinion, to zones with intermediate-to-high chitosan concentration which can assure a large spectrum of antimicrobial protection concomitantly with a significant enhancement of osseointegration, favored by the presence of biomimetic hydroxyapatite.

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“…We established in [15] that the interaction between a CTS and acetic acid is apparent in the Raman scattering spectra of dilute aqueous solutions of acetic acid as the band of the acetate ion at 934 cm −1 , indicating the formation of hydrogenbonded ion pairs of the CTS + · Actype. Protonation of the CTS monomer and the formation of CTS + · Ac - ion pairs (calculated allowing for the effect of water within the IEFPCM model) results in disruption of the O8-H15···N1 H-bonds (Fig.…”

Section: Different Sets Of Inter-and Intra-unitmentioning

confidence: 92%

Estimating the energy of intramolecular hydrogen bonds in chitosan oligomers

Mikhailov

Лазарев

2016

Russ. J. Phys. Chem.

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The effect the number of chitosan monomer units CTS n (n = 1-5), the protonation of chitosan dimers, and the interaction between CTS n (n = 1-3) and acetate ions have on the energy of intramolecular hydrogen bonds is investigated by means of QTAIM analysis and solving the vibrational problem within the cluster-continuum model. It is established that the number of H-bonds in CTS n is 2n − 1 and the total energy of H-bonds grows by ~20 kJ/mol. It is concluded that the hydrogen bonds between CTS and acetate ions play a major role in the stabilization of polyelectrolyte complexes in dilute acetic acid solutions of CTS.

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Complexation of chitosan with acetic acid according to Fourier transform Raman spectroscopy data

Cited by 20 publications

References 3 publications

Characteristics of the complexing of chitosan with sodium dodecyl sulfate, according to IR spectroscopy data and quantum-chemical calculations

Characteristics of the complexing of chitosan with sodium dodecyl sulfate, according to IR spectroscopy data and quantum-chemical calculations

Combinatorial MAPLE deposition of antimicrobial orthopedic maps fabricated from chitosan and biomimetic apatite powders

Estimating the energy of intramolecular hydrogen bonds in chitosan oligomers

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