Solubility of Mg-containing beta-tricalcium phosphate at 25 degrees C.

Solubility of Mg-containing beta-tricalcium phosphate at 25 degrees C.
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DOI:
10.1016/j.actbio.2008.06.010
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发表时间:
2009-01
期刊:
影响因子:
9.7
通讯作者:
LeGeros, R. Z.
LeGeros, R. Z.
中科院分区:
工程技术1区
文献类型:
--
作者:
Li, Xia;Ito, Atsuo;Sogo, Yu;Wang, Xiupeng;LeGeros, R. Z.

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通过将βMgTCP粉末在25℃、氮气气氛下在CH3COOH-CH3COONa缓冲溶液中浸泡27个月来测定不同镁含量的含镁β-磷酸三钙(βMgTCP)的平衡溶解度。 βMgTCP 的溶度积 (pKsp) 的负对数表示为 pKsp = 28.87432 + 1.40348C − 0.3163C2 + 0.04218C3 − 0.00275C4 + 0.0000681659C5,其中 C 为 βMgTCP 中的镁含量 (mol.%)。 βMgTCP 的溶解度随着镁含量的增加而降低,因为结构稳定性增加并且可能在表面形成白铁矿型相。结果,当 pH 值低于 6.0 时,镁含量为 10.1 mol.% 的 βMgTCP 的溶解度低于羟基磷灰石。发现在锌或镁摩尔含量相同的情况下,βMgTCP 比含锌的 β-磷酸三钙更易溶解。通过选择合适的 pKsp 来调节 Mg 含量,可以控制 βMgTCP 的溶解度和镁从 βMgTCP 中的释放速率。
The equilibrium solubility of Mg-containing β-tricalcium phosphate (βMgTCP) with various magnesium contents was determined by immersing βMgTCP powder for 27 months in a CH3COOH–CH3COONa buffer solution at 25 °C under a nitrogen gas atmosphere. The negative logarithm of the solubility product (pKsp) of βMgTCP was expressed as pKsp = 28.87432 + 1.40348C − 0.3163C2 + 0.04218C3 − 0.00275C4 + 0.0000681659C5, where C is the magnesium content in βMgTCP (mol.%). The solubility of βMgTCP 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, βMgTCP with 10.1 mol.% magnesium had a lower solubility than that of hydroxyapatite below pH 6.0. βMgTCP was found to be more soluble than zinc-containing β-tricalcium phosphate given the same molar content of zinc or magnesium. The solubility of βMgTCP and release rate of magnesium from βMgTCP can be controlled by adjusting the Mg content by selecting the appropriate pKsp.
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