title: Physicochemical characterisation of the supramolecular structure of luteolin/cyclodextrin inclusion complex.
abstract: The formation of supramolecular inclusion complexes between luteolin and five cyclodextrins namely β-cyclodextrin (β-CD), methyl-β-cyclodextrin (M-β-CD), hydroxyethyl-β-cyclodextrin (HE-β-CD), hydroxypropyl-β-cyclodextrin (HP-β-CD) and glucosyl-β-cyclodextrin (G-β-CD) was investigated. Results from phase-solubility studies showed that luteolin formed 1:1 stoichiometric inclusion complexes with these cyclodextrins with the G-β-CD complex displaying the greatest stability constant. The supramolecular structure of the luteolin/G-β-CD complex was investigated by ultraviolet-visible spectroscopy (UV), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray diffractometry (XRD). Results showed clearly the formation of a supramolecular complex in which the guest molecule, luteolin, was entrapped inside the cavity of the host, G-β-CD. The close association between luteolin and G-β-CD resulted in changes in some of the characteristic spectral, phase transitional and morphological properties of luteolin. Furthermore, molecular docking study showed that the complex was formed with the B ring of luteolin inserted into the cavity of G-β-CD.
authors.affiliation: School of Food Science, Henan Institute of Science and Technology, Xinxiang 453003, PR China.
authors.forename: Benguo
authors.initials: B
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Zhao
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiaoai
authors.initials: X
authors.lastname: Zhu
authors.forename: Guizhao
authors.initials: G
authors.lastname: Liang
mesh_terms: D002152:Calorimetry, Differential Scanning; D003505:Cyclodextrins / Q000737:chemistry*; D047311:Luteolin / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D003505:Cyclodextrins; D046911:Macromolecular Substances; D047311:Luteolin