Control of CaCO3 Crystal Growth by the Acidic Proteinaceous Fraction of Calcifying Marine Organisms: AnInVitroStudyofBiomineralization

Control of CaCO3 Crystal Growth by the Acidic Proteinaceous Fraction of Calcifying Marine Organisms: AnInVitroStudyofBiomineralization
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钙化海洋生物的酸性蛋白质部分对 CaCO3 晶体生长的控制:生物矿化的体外研究

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发表时间:
2012
期刊:
影响因子:
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通讯作者:
R. Shinjo
R. Shinjo
中科院分区:
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文献类型:
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作者:
Azizur Rahman;R. Shinjo

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人们对碳酸钙结晶的早期阶段知之甚少(Pouget et al.2009年;Gebauer、Volkel和Colfen 2008年),尽管这种矿物已经被研究了一个多世纪。确定的前体相是生物中的无定形碳酸钙(ACC)(Addadi,Raz和Weiner 2003;Weiner等人。2003)和仿生成矿作用。生物体中的晶体成核和生物矿化过程是通过复杂的内部化学调节发生的,这种调节与海水的“恒定离子介质”显著不同(Falini等人。1996年;Addadi等人。2006年;拉赫曼和大森,2009年)。镁离子主要负责控制碳酸钙沉淀的动力学和热力学,特别是对方解石形成的抑制(Davis、Dove和De Yoreo 2000)。在含有少量镁离子的溶液中,常温下方解石的析出在热力学和动力学上都是有利的。最近,据报道,尽管镁离子在结晶过程中对文石的产生有影响,但酸性大分子即使在高镁离子存在的情况下也会在软珊瑚中产生方解石晶体(Rahman,Oomori和Worheide,2011;Rahman和Oomori,2009)。
Only little is known about the early stages of CaCO3 crystallization (Pouget et al. 2009; Gebauer, Volkel, and Colfen 2008), though this mineral has been studied for more than a century now. Identified precursor phases are amorphous calcium carbonate (ACC) in bio(Addadi, Raz, and Weiner 2003; Weiner et al. 2003) and biomimetic mineralization. Crystal nucleation and biomineralization processes in organisms occur through a sophisticated regulation of internal chemistry that departs significantly from the “constant ionic medium” of seawater (Falini et al. 1996; Addadi et al. 2006; Rahman and Oomori 2009). Magnesium ions are mainly responsible for controlling the kinetics and thermodynamics of calcium carbonate precipitation, especially inhibition of the calcite formation (Davis, Dove, and De Yoreo 2000). The precipitation of calcite at ambient temperature is both thermodynamically and kinetically favored in solutions containing low amounts of magnesium ions. Very recently, it is reported that although Mg2+ is influential in producing aragonite in the crystallization process, acidic macromolecules produced calcite crystals in soft corals even in the presence of high Mg2+ ions (Rahman, Oomori, and Worheide 2011; Rahman and Oomori 2009).
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