title: A novel skeletal drug-delivery system using self-setting calcium phosphate cement. 3. Physicochemical properties and drug-release rate of bovine insulin and bovine albumin.
abstract: A novel drug-deliver device based on a self-setting bioactive cement formed from tetracalcium phosphate and dicalcium phosphate has been developed and tested in vitro using bovine insulin and bovine albumin as model polypeptide drugs. Equimolar mixtures of the calcium phosphate powders containing bovine insulin and bovine albumin were transformed into a hydroxyapatite cement after being mixed with a dilute phosphoric acid solution. X-ray diffraction and FT-IR spectra results suggested that the raw materials transformed into lower crystallinity of hydroxyapatite as it hardened. In vitro drug release from cement pellets into a 0.1 mol/L phosphate buffer at pH 7.40 and 37 degrees C continued for more than 3 weeks. Release from the drug-loaded cements followed the Higuchi model equation.
authors.affiliation: Department of Pharmaceutical Technology, Kobe Pharmaceutical University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Otsuka
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Suwa
authors.forename: J L
authors.initials: JL
authors.lastname: Fox
authors.forename: W I
authors.initials: WI
authors.lastname: Higuchi
mesh_terms: D001843:Bone Cements; D001842:Bone and Bones / Q000378:metabolism*; D002130:Calcium Phosphates / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D002152:Calorimetry, Differential Scanning; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D016503:Drug Delivery Systems; D005583:Fourier Analysis; D006245:Hardness Tests; D006882:Hydroxyapatites / Q000737:chemistry; D007328:Insulin / Q000008:administration & dosage* / Q000493:pharmacokinetics; D012710:Serum Albumin, Bovine / Q000008:administration & dosage* / Q000493:pharmacokinetics; D012995:Solubility; D013055:Spectrophotometry, Infrared; D014961:X-Ray Diffraction
chemical_list: D001843:Bone Cements; D002130:Calcium Phosphates; D006882:Hydroxyapatites; D007328:Insulin; D012710:Serum Albumin, Bovine