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Solubility of Mg-containing β-tricalcium phosphate at 25 °C

✍ Scribed by Xia Li; Atsuo Ito; Yu Sogo; Xiupeng Wang; R.Z. LeGeros

Book ID
103999487
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
438 KB
Volume
5
Category
Article
ISSN
1742-7061

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✦ Synopsis

The equilibrium solubility of Mg-containing b-tricalcium phosphate (bMgTCP) with various magnesium contents was determined by immersing bMgTCP powder for 27 months in a CH 3 COOH-CH 3 COONa buffer solution at 25 °C under a nitrogen gas atmosphere. The negative logarithm of the solubility product (pK sp ) of bMgTCP was expressed as pK sp = 28.87432 + 1.40348C À 0.3163C 2 + 0.04218C 3 À 0.00275C 4 + 0.0000681659C 5 , where C is the magnesium content in bMgTCP (mol.%). The solubility of bMgTCP decreased with increasing magnesium content owing to the increased structural stability and possible formation of a whitlockite-type phase on the surface. As a result, bMgTCP with 10.1 mol.% magnesium had a lower solubility than that of hydroxyapatite below pH 6.0. bMgTCP was found to be more soluble than zinc-containing b-tricalcium phosphate given the same molar content of zinc or magnesium. The solubility of bMgTCP and release rate of magnesium from bMgTCP can be controlled by adjusting the Mg content by selecting the appropriate pK sp .

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