title: Magnetic glass ceramics for sustained 5-fluorouracil delivery: characterization and evaluation of drug release kinetics.
abstract: In the present study, magnetic glass ceramics in the system Fe2O3 ∙ TiO2 ∙ P2O5 ∙ SiO2 ∙ MO (M=Mg, Ca, Mn, Cu, Zn or Ce) are prepared. The effect of adding different cations on the thermal behavior, developed phases, microstructure and magnetic properties is studied using differental thermal analysis (DTA), X-ray diffraction analysis (XRD), transmission electron microscope (TEM), FT-infrared transmission (FT-IR) and vibrating sample magnetometer (VSM) respectively. The magnetic glass ceramics are tested as delivery systems for 5-fluorouracil. Modeling and analysis of release kinetics are addressed. The application of Higuchi square root of time model and the first order release model indicated that, 5-FU is released by diffusion controlled mechanisms, and that its released rate depends greatly on the concentration of loaded drug during the loading stage. The obtained results suggested that, the prepared magnetic glass ceramics can be used for cancer treatment by hyperthermia and/or by localized delivery of therapeutic doses of 5-fluorouracil.
authors.affiliation: Glass Research Department, National Research Center, Dokki, ElBehoos St., Cairo 12311, Egypt. Electronic address: Salwa_NRC@hotmail.com.
authors.forename: S A M
authors.initials: SA
authors.lastname: Abdel-Hameed
authors.affiliation: Biomaterial Department, National Research Center, Dokki, ElBehoos St., Cairo 12311, Egypt.
authors.forename: A M
authors.initials: AM
authors.lastname: El-Kady
authors.affiliation: Glass Research Department, National Research Center, Dokki, ElBehoos St., Cairo 12311, Egypt.
authors.forename: M A
authors.initials: MA
authors.lastname: Marzouk
mesh_terms: D001672:Biocompatible Materials; D002516:Ceramics / Q000737:chemistry*; D003460:Crystallization; D016503:Drug Delivery Systems / Q000379:methods*; D065546:Drug Liberation; D005290:Ferric Compounds / Q000737:chemistry; D005472:Fluorouracil / Q000737:chemistry* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008280:Magnetics; D046529:Microscopy, Electron, Transmission; D017553:Phosphorus Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D005290:Ferric Compounds; D017553:Phosphorus Compounds; C009495:titanium dioxide; C000499:ferric oxide; C012500:phosphorus pentoxide; D012822:Silicon Dioxide; C023506:Glass ceramics; D014025:Titanium; D005472:Fluorouracil
keywords: 5-Fluorouracil; Drug delivery; Glass ceramics; Magnetic