Structure and stability of warfarin-sodium inclusion complexes formed with permethylated monoamino-β-cyclodextrin

G. Tárkányi, Krisztina Németh, Réka Mizsei, Orsolya Todoubleacuteke, J. Visy, M. Simonyi, László Jicsinszky, Julianna Szemán, Lajos Szente

Research output: Article

10 Citations (Scopus)

Abstract

Inclusion complexes of warfarin enantiomers with permethylated monoamino-β-cyclodextrin (PMMABCD) were characterized using CE and 1H NMR spectroscopy in aqueous solution. These techniques gave complementary information on the stability and the structure of the diastereomeric host-guest inclusion complexes. The stability constants were determined from CE experiments in a wide pH range. Change in the migration order on the variation of the pH was observed. 1H NMR assignments have been established for the seven non-equivalent carbohydrate units of the host in the complex at pH 7-9. Specific H-H distance restraints were obtained from NOESY experiments and were introduced into molecular modeling to establish the geometry of the inclusion complexes. It was found that the open side chain warfarin enters the cavity from the primary side of the CD. The orientation of the coumarin ring within the cavity has the same preference for the two warfarin enantiomers owing to an ionic interaction with the amino group of the CD. Accordingly, enantioselectivity at pH 8.5 arises from the difference in the CH/π interactions between warfarin aromatics and the manifold of CH groups of the CD.

Original languageEnglish
Pages (from-to)292-298
Number of pages7
JournalJournal of Pharmaceutical and Biomedical Analysis
Volume72
DOIs
Publication statusPublished - jan. 18 2013

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Cyclodextrins
Warfarin
Enantiomers
Molecular modeling
Enantioselectivity
Nuclear magnetic resonance spectroscopy
Magnetic Resonance Spectroscopy
Experiments
Carbohydrates
Nuclear magnetic resonance
Geometry
Proton Magnetic Resonance Spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Drug Discovery
  • Pharmaceutical Science
  • Spectroscopy
  • Clinical Biochemistry

Cite this

Structure and stability of warfarin-sodium inclusion complexes formed with permethylated monoamino-β-cyclodextrin. / Tárkányi, G.; Németh, Krisztina; Mizsei, Réka; Todoubleacuteke, Orsolya; Visy, J.; Simonyi, M.; Jicsinszky, László; Szemán, Julianna; Szente, Lajos.

In: Journal of Pharmaceutical and Biomedical Analysis, Vol. 72, 18.01.2013, p. 292-298.

Research output: Article

Tárkányi, G. ; Németh, Krisztina ; Mizsei, Réka ; Todoubleacuteke, Orsolya ; Visy, J. ; Simonyi, M. ; Jicsinszky, László ; Szemán, Julianna ; Szente, Lajos. / Structure and stability of warfarin-sodium inclusion complexes formed with permethylated monoamino-β-cyclodextrin. In: Journal of Pharmaceutical and Biomedical Analysis. 2013 ; Vol. 72. pp. 292-298.
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