title: Effect of pore size of FSM-16 on the entrapment of flurbiprofen in mesoporous structures.
abstract: The interaction between FSM-16 and flurbiprofen (FBP) in the mesopores of FSM-16 was investigated by using three types of FSM-16 with different pore diameters, i.e., FSM-16(Oc), FSM-16(Do) and FSM-16(Doc) (pore diameters 16.0, 21.6, 45.0 A, respectively). Solid dispersions of 30% FBP-70% FSM-16 were prepared by solvent evaporation and sealed-heating of the physical mixture at 100 degrees C for 6 h. Changes in the molecular state of FBP were investigated using powder X-ray diffractometry, thermal analysis and FT-IR spectroscopy. The changes in pore diameter and specific surface area of FSM-16 systems were investigated by small angle X-ray scattering and nitrogen gas adsorption. Powder X-ray diffractometry and thermal analysis revealed that FBP was adsorbed onto the mesopores of FSM-16(Do) and FSM-16(Doc), leading to an amorphous state, while no change was observed for FSM-16(Oc). Fourier-transformed IR spectroscopy showed a hydrogen bond interaction between the carbonyl groups of FBP and the silanol groups of FSM-16. The pore diameter and specific surface area of FSM-16 in solid dispersions decreased due to the adsorption of FBP. Improved dissolution of FBP from solid dispersions prepared by the evaporation and the sealed-heating methods was observed in comparison with FBP crystals.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. ytozuka@faculty.chiba-u.jp
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Tozuka
authors.forename: Arpansiree
authors.initials: A
authors.lastname: Wongmekiat
authors.forename: Kyoko
authors.initials: K
authors.lastname: Kimura
authors.forename: Kunikazu
authors.initials: K
authors.lastname: Moribe
authors.forename: Shigeo
authors.initials: S
authors.lastname: Yamamura
authors.forename: Keiji
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D004337:Drug Carriers; D005480:Flurbiprofen / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D004337:Drug Carriers; C481639:FSM 16; D005480:Flurbiprofen; D012822:Silicon Dioxide