title: UV-vis and FTIR-ATR characterization of 9-fluorenon-2-carboxyester/(2-hydroxypropyl)-beta-cyclodextrin inclusion complex.
abstract: In this work, the usefulness of (2-hydroxypropyl)-beta-cyclodextrin (HP-beta-CyD) as a tool to form an inclusion complex with 9-fluorenonic derivative (AG11) has been investigated, in pure water, by UV absorption. Phase-solubility diagrams allowed the determination of the association constant between AG11 and HP-beta-CyD. At the same time, solid binary systems between AG11 and HP-beta-CyD have been prepared in 1:1 stoichiometry by co-precipitation method. In order to confirm the complexation, FTIR spectroscopy in ATR geometry measurements have been performed and the results have been compared with the free compounds and the corresponding physical mixture in the same molar ratio. The nature of the interactions between AG11 and HP-beta-CyD has been elucidated also by applying mathematical procedures such as deconvolution and curve fitting. Improvement of the aqueous solubility is expected to improve the bioavailability of the drug in oral administration.
authors.affiliation: Dipartimento Farmaco-Chimico, Facoltà di Farmacia, Università di Messina, Viale Annunziata, 98168 Messina, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Stancanelli
authors.forename: R
authors.initials: R
authors.lastname: Ficarra
authors.forename: C
authors.initials: C
authors.lastname: Cannavà
authors.forename: M
authors.initials: M
authors.lastname: Guardo
authors.forename: M L
authors.initials: ML
authors.lastname: Calabrò
authors.forename: P
authors.initials: P
authors.lastname: Ficarra
authors.forename: R
authors.initials: R
authors.lastname: Ottanà
authors.forename: R
authors.initials: R
authors.lastname: Maccari
authors.forename: V
authors.initials: V
authors.lastname: Crupi
authors.forename: D
authors.initials: D
authors.lastname: Majolino
authors.forename: V
authors.initials: V
authors.lastname: Venuti
mesh_terms: D000073738:2-Hydroxypropyl-beta-cyclodextrin; D005449:Fluorenes / Q000737:chemistry*; D015394:Molecular Structure; D044367:Phase Transition; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D014867:Water / Q000737:chemistry; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D005449:Fluorenes; D047392:beta-Cyclodextrins; D014867:Water; D000073738:2-Hydroxypropyl-beta-cyclodextrin