title: Characterization of calcium phosphates precipitated from simulated body fluid of different buffering capacities.
abstract: The purpose of this experiment was to study the properties of calcium phosphate precipitated from simulated body fluids (SBFs) with different buffering capacities. The Ca/P molar ratios of the precipitates were determined and the microstructure of a sintered precipitate was studied. The results indicate that the pH of the SBF increases during calcium phosphate precipitations, which affects the Ca/P molar ratios and chemical compositions of these precipitates. A precipitate with a Ca/P molar ratio close to the stoichiometric molar ratio of hydroxyapatite was obtained when the pH of the SBF was continuously adjusted to 7.26 during precipitation. This precipitate has a fine-grained and laminated microstructure after sintering at 1000 degrees C in air. It seems that SBF can be used as a tool to study apatite-like precipitation in vitro when the pH of the solution is carefully controlled.
authors.affiliation: Centre for Oral Biology at Novum, Karolinska Institute, Huddinge, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: H
authors.initials: H
authors.lastname: Liao
authors.forename: M
authors.initials: M
authors.lastname: Sjöström
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry*; D002021:Buffers; D011232:Chemical Precipitation; D017886:Durapatite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D011137:Polystyrenes; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014025:Titanium
chemical_list: D001672:Biocompatible Materials; D002021:Buffers; D011137:Polystyrenes; D017886:Durapatite; D014025:Titanium