Spectroscopic characterization of the inclusion complexes of luteolin with native and derivatized β-cyclodextrin

Carolina Jullian, Constanza Cifuentes, Muriel Alfaro, Sebastián Miranda, Germán Barriga, Claudio Olea-Azar

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

37 Citas (Scopus)

Resumen

The inclusion complexes of Luteolin (LU) with cyclodextrins (CDs) including β-cyclodextrin (βCD), hydroxypropyl-β-cyclodextrin (HPβCD) and dimethyl-β-cyclodextrin (DMβCD), Scheme 1, have been investigated using the method of steady-state fluorescence. The stoichiometric ratio of the three complexes was found to be 1:1 and the stability constants (K) were estimated from spectrofluorometric titrations, as well as the thermodynamic parameters. Maximum inclusion ability was obtained in the case of HPβCD followed by DMβCD and βCD. Moreover, 1H NMR and 2D NMR were carried out, revealing that LU has different form of inclusion which is in agreement with molecular modeling studies. These models confirm that when LU-βCD and LU-DMβCD complexes are formed, the B-ring is oriented toward the primary rim; however, for LU-HPβCD complex this ring is oriented toward the secondary rim. The ESR results showed that the antioxidant activity of luteolin was the order LU-HPβCD > LU-DMβCD > LU-βCD > LU, hence the LU-complexes behave are better antioxidants than luteolin free.

Idioma originalInglés
Páginas (desde-hasta)5025-5031
Número de páginas7
PublicaciónBioorganic and Medicinal Chemistry
Volumen18
N.º14
DOI
EstadoPublicada - 15 jul 2010

Áreas temáticas de ASJC Scopus

  • Bioquímica
  • Medicina molecular
  • Biología molecular
  • Ciencias farmacéuticas
  • Descubrimiento de medicamentos
  • Bioquímica clínica
  • Química orgánica

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