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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Compositional analysis of a polymer-induced liquid-precursor (PILP) amorphous CaCO_3 phase
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Compositional analysis of a polymer-induced liquid-precursor (PILP) amorphous CaCO_3 phase

机译：聚合物诱导的液体前体（PILP）非晶CaCO_3相的成分分析

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摘要

Amorphous calcium carbonate (ACC) has been of keen interest in the biomimetics field because of recent evidence which suggests it plays an important role in biomineralization. In this report, an in vitro model system is used to examine the composition of an amorphous phase generated by polyanionic process-directing agents, such as the sodium salt of polyaspartic acid (Pasp), which is considered a simple mimic to the proteins associated with calcific biominerals. This additive leads to the formation of a highly hydrated, amorphous mineral precursor to calcium carbonate (CaCO3), referred to as a polymer-induced liquid-precursor (PILP) phase. The precursor phase was collected by centrifugation, and the quantity of precursor phase and the water content were determined. It was found that Pasp promotes and stabilizes the amorphous precursor, which has a composition that steadily changes with time as the polymer and water are excluded. Elemental analysis was used to investigate the role of the polymer in influencing the calcium/carbonate ratio, the water content, and the amount of precursor phase. Raman and ATR–FTIR spectroscopy were used to compare the compositions of the precursor phases generated with different polymeric concentrations. The role of Pasp in generating and stabilizing the ACC precursor phase is discussed.
机译：由于最近的证据表明，无定形碳酸钙（ACC）在仿生领域中引起了人们的极大兴趣，这表明它在生物矿化中起着重要的作用。在本报告中，使用了体外模型系统来检查由聚阴离子过程导向剂（例如聚天冬氨酸（Pasp）的钠盐）生成的无定形相的组成，该物质被认为是与之相关的蛋白质的简单模拟物钙质生物矿物质。该添加剂导致形成碳酸钙（CaCO3）的高度水合的无定形矿物前体，称为聚合物诱导的液体前体（PILP）相。通过离心收集前体相，并测定前体相的量和水含量。发现Pasp促进并稳定了无定形前体，该无定形前体的组成随着除去聚合物和水而随时间稳定地变化。元素分析用于研究聚合物在影响钙/碳酸盐比，水含量和前体相量方面的作用。拉曼光谱和ATR-FTIR光谱用于比较不同聚合物浓度下生成的前体相的组成。讨论了Pasp在生成和稳定ACC前体相中的作用。

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