重新定义的离子关联常数对酸核化和生物矿物化产生了影响
David P McDonogh1, Julian D Gale2, Paolo Raiteri3
1Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstr. 9, 30167, Hannover, Germany.
Nature communications
|April 18, 2024
概括
酸 (CaP) 规范得到了修订,显示酸,而不是酸,主导生物矿物化. 这一发现纠正了对了解骨和牙形成至关重要的长期热力学数据.
科学领域:
- 生物矿物化 生物矿物化
- 材料科学 材料科学 材料科学
- 解决方案化学 解决方案化学
背景情况:
- 正酸盐 (CaPs) 是重要的生物矿物质,在骨和牙中形成酸 (HAP).
- CaP核化路径和溶液中的离子分化仍在争论中.
- 了解初始离子相互作用是生物矿物化的基础.
研究的目的:
- 为了研究溶液中的酸 (CaP) 离子协会.
- 为了澄清CaP核化和HAP形成的机械路径.
- 修订现有的热力学常量,用于CaP的特异化.
主要方法:
- 用电位计定位来测量离子关联常数.
- 计算机模拟被用于模拟CaP特异和离子相互作用.
- 分析了热力学数据,以修改文献常数.
主要成果:
- 证实了Ca2+和H2PO4-,以及Ca2+和HPO42-的文献关联常数.
- 发现Ca2+和PO43-的关联常数被高估了两个数量级.
- 在pH值9.0以下,Ca2+和PO43-的相关性是可以忽略不计的,这是由于过早的相位分离.
- [CaHPO4]0在pH 6-10之间主导水性CaP物种化.
- 经过修订的热力学揭示了显著的多离子协会,作为动力陷.
结论:
- 酸 ([CaHPO4]0) 的结合在接近中性pH的降水中至关重要,特别是在生物矿物化中.
- 之前关于Ca2+和PO43-协会的热力学数据需要大幅修订.
- 准确的CaP特异化对于理解生物矿物质形成和相关病态至关重要.
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