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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Related Experiment Video

Updated: Mar 23, 2026

Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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NMR Study on the Inclusion Complexes of β-Cyclodextrin with Isoflavones.

Rui Zhao1,2,3, Corine Sandström4, Haiyang Zhang5

  • 1School of Food and Chemical Engineering, Beijing Engineering and Technology Research Center of Food Additives, Beijing Higher Institution Engineering Research Center of food additives and Ingredients, Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University, Beijing 100048, China. zhaorui@btbu.edu.cn.

Molecules (Basel, Switzerland)
|April 5, 2016
PubMed
Summary

Nuclear magnetic resonance (NMR) spectroscopy revealed how beta-cyclodextrin (β-CD) forms inclusion complexes with daidzein and daidzin. Different binding orientations were observed for daidzein, while daidzin

Keywords:
NMRflavonoidsinteractionβ-cyclodextrin

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Cyclodextrins are cyclic oligosaccharides with a hydrophobic cavity and hydrophilic exterior, widely used for encapsulating guest molecules.
  • Isoflavonoids like daidzein, daidzin, and puerarin, found in Radix puerariae, possess various biological activities.
  • Understanding the host-guest interactions between cyclodextrins and isoflavonoids is crucial for developing novel drug delivery systems and enhancing their bioavailability.

Purpose of the Study:

  • To elucidate the structural basis of inclusion complex formation between beta-cyclodextrin (β-CD) and isoflavonoids (daidzein and daidzin) in D2O.
  • To investigate the binding affinities and stoichiometry of these host-guest interactions.
  • To compare the binding behavior of individual isoflavonoids and their mixture under simulated chromatographic conditions.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy, specifically diffusion-ordered spectroscopy (DOSY), was employed to study the inclusion complexes.
  • Molecular docking simulations were utilized to construct and visualize the determined inclusion complex structures.
  • Analysis of a mixture of puerarin, daidzein, and daidzin with and without β-CD.

Main Results:

  • Two distinct 1:1 inclusion complexes of β-CD with daidzein were identified, with daidzein exhibiting deep insertion into the β-CD cavity in varied orientations.
  • A 1:1 inclusion complex of β-CD with daidzin was observed, where the flavonoid moiety of daidzin entered the β-CD cavity via the wider rim.
  • DOSY analysis of the isoflavonoid mixture demonstrated differential binding affinities to β-CD, mimicking chromatographic separation behavior.

Conclusions:

  • The study successfully characterized the structural details and stoichiometry of β-CD-isoflavonoid inclusion complexes using NMR spectroscopy and molecular docking.
  • The findings highlight the specific binding modes and affinities of daidzein and daidzin within the β-CD cavity.
  • The comparative analysis of isoflavonoid mixtures provides insights into their potential separation and delivery applications using cyclodextrin complexation.