title: insights into novel supramolecular complexes of two solid forms of norfloxacin and β-cyclodextrin.
abstract: The solid-state properties of novel complexes of β-cyclodextrin and two different solid forms of norfloxacin were investigated at the molecular level, in an attempt to obtain promising candidates for the preparation of alternative matrices used in pharmaceutical oral formulations. In order to evaluate the physical properties inherited from the different polymorphs, these supramolecular systems were characterized using a variety of spectroscopic techniques including natural-abundance (13) C cross-polarization magic-angle-spinning (CP-MAS) nuclear magnetic resonance (NMR), powder X-ray diffraction, and Fourier transform infrared spectroscopy. The intrinsic proton spin-lattice relaxation times detected in (13) C CP-MAS NMR spectra are used to confirm and distinguish the complex formation, as well as to provide better insights into the molecular fragments that are involved in the interaction with β-cyclodextrin.
authors.affiliation: Facultad de Matemática, Astronomía y Física and IFEG (CONICET), Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina.
authors.forename: Ana K
authors.initials: AK
authors.lastname: Chattah
authors.forename: Kamal H
authors.initials: KH
authors.lastname: Mroue
authors.forename: Laura Y
authors.initials: LY
authors.lastname: Pfund
authors.forename: Ayyalusamy
authors.initials: A
authors.lastname: Ramamoorthy
authors.forename: Marcela R
authors.initials: MR
authors.lastname: Longhi
authors.forename: Claudia
authors.initials: C
authors.lastname: Garnero
mesh_terms: D002152:Calorimetry, Differential Scanning / Q000379:methods; D002626:Chemistry, Pharmaceutical / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D009643:Norfloxacin / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014961:X-Ray Diffraction / Q000379:methods; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D047392:beta-Cyclodextrins; C031215:betadex; D009643:Norfloxacin
keywords: FTIR; X-ray diffractometry; characterization; complexation; cyclodextrins; norfloxacin; polymorphism; solid state NMR