Journal Title
Title of Journal: J Solution Chem
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Abbravation: Journal of Solution Chemistry
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Authors: Diana Rabadjieva Stefka Tepavitcharova Kostadinka Sezanova Rumyana Gergulova
Publish Date: 2016/10/12
Volume: 45, Issue: 11, Pages: 1620-1633
Abstract
The metastable and stable equilibria during the precipitation of calcium phosphates in three biomimetic systems namely SBFcCaCl2–K2HPO4–H2O SBFcCaCl2–MgCl2–K2HPO4–H2O and SBFcCaCl2–ZnCl2–K2HPO4–H2O where SBFc denotes a conventional simulated body fluid were modeled by a thermodynamic approach ionassociation model computer program PHREEQCI v2143 In all cases the highest saturation indices SI and the thermodynamic stability were calculated for hydroxyapatite Ca5PO43OH Coprecipitation of metastable phases of seven salts in the first system coprecipitation of additional four magnesium salts in the second system and no coprecipitation of zinc salts in the third system were calculated at pH 8 Precipitation of amorphous calcium phosphate incorporating Mg2+ Na+ K+ textCO 32 and Cl− ions at levels close to those of natural enamel dentin and bone instead of the thermodynamically stable hydroxyapatite was experimentally found This reveals that kinetic factors are decisive for the precipitation processes In addition the phase transformations of the precipitated metastable amorphous products 994 SI 0 during their maturation in the three simulated body fluids differing in their concentrations of textHCO 3 and Cl− ions and organic macromolecules were also modeled Dissolution of all magnesium salts was found to occur and equilibrium of the more stable calcium salts was established depending on the textHCO 3 concentration In contrast transformation of the stable equilibrium products SI 0 to the thermodynamically stable hydroxyapatite SI = 0 independent of the textHCO 3 concentration was both calculated and experimentally proven Analogous distribution of the species was calculated for the initial and equilibrium solutions of the studied SBFs while it was different for the metastable solutions The predominance of free Me2+ ions Me = Ca Mg was calculated in all studied cases
Keywords:
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- A Study of the Excess Properties of Aliphatic Chlorinated Compounds with Benzylalcohol at Various Temperatures
- Liquid–Liquid Equilibria of the Methanol + Toluene + Methylcyclohexane Ternary System at 278.15, 283.15, 288.15, 293.15, 298.15 and 303.15 K
- Complexation of Am(III) and Nd(III) by 1,10-Phenanthroline-2,9-Dicarboxylic Acid
- Diffusion Coefficients for the Ternary System Water + Chloroform + Acetic Acid at 25 °C
- Binding Mechanism of Bioactive Cetirizine Hydrochloride to Sudlow’s Site I of Serum Albumins
- Electroluminescent Properties of LECs Based on Ionic Transition Metal Complexes Using Tetrazole-Based Ancillary Ligand
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- Solvent Effects on the Protonation Constants of Some α -Amino Acid Esters in 1,4-Dioxane–Water Mixtures
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- The Mixing Enthalpy Interaction Coefficients of N , N ′-Hexamethylenebisacetamide with l -Alanine and l -Serine in Aqueous Glucose Solutions at 298.15 K
- Effect of Temperature on Salt–Salt Aqueous Biphasic Systems: Manifestations of Upper Critical Solution Temperature
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