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Updated: Jun 11, 2026
10:10
Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
Published on: August 15, 2016
Electronic structure and normal vibrations in (+)-catechin and (-)-epicatechin encapsulated beta-cyclodextrin
Jayshree K Khedkar1, Vivekanand V Gobre, Rahul V Pinjari
1Department of Chemistry, University of Pune, Ganeshkhind, Pune 411007, India.
The Journal of Physical Chemistry. A
|July 6, 2010
Summary
Density functional theory reveals distinct binding patterns between beta-cyclodextrin (beta-CD) and flavan-3-ol enantiomers, (+)-catechin (CA) and (-)-epicatechin (EC). These host-guest interactions influence molecular structures and infrared spectra, confirmed by experimental data.
Area of Science:
- Computational Chemistry
- Supramolecular Chemistry
- Molecular Modeling
Background:
- Beta-cyclodextrin (beta-CD) is a cyclic oligosaccharide widely used as a host molecule.
- Flavan-3-ols, such as (+)-catechin (CA) and (-)-epicatechin (EC), are important natural compounds with distinct stereochemistry.
- Understanding host-guest interactions is crucial for applications in drug delivery and materials science.
Purpose of the Study:
- To investigate the host-guest interactions between beta-cyclodextrin and flavan-3-ol enantiomers using computational methods.
- To elucidate the specific binding modes and stabilizing interactions within beta-CD-CA and beta-CD-EC complexes.
- To correlate computational findings with experimental spectroscopic data.
Main Methods:
- Density Functional Theory (DFT) calculations were employed to model the complexes.
- Analysis of minimum energy structures and binding interactions.
- Comparison of computational results with experimental Nuclear Magnetic Resonance (NMR) and infrared (IR) spectroscopy data.
- Natural Bond Orbital (NBO) analyses and electron density topography were utilized.
Main Results:
- Distinct binding patterns were identified for beta-CD-CA and beta-CD-EC complexes.
- Specific interactions, including hydrogen bonding and hydroxyl group involvement, were detailed for each complex.
- Computational structures were consistent with experimental NMR data.
- Characteristic frequency shifts in IR spectra were analyzed and explained by computational findings.
Conclusions:
- The study provides a detailed molecular-level understanding of beta-cyclodextrin's interactions with catechin and epicatechin enantiomers.
- Computational modeling successfully predicted and explained experimental observations in NMR and IR spectroscopy.
- The findings contribute to the knowledge of flavan-3-ol complexation with cyclodextrins, relevant for various applications.
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