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Stabilization of Amorphous Calcium Carbonate with Nanofibrillar Biopolymers

机译：纳米原纤维生物聚合物稳定无定形碳酸钙

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摘要

Calcium carbonate is the most abundant biomineral that is biogenically formed with a vast array of nano and microscale features. Among the less stable polymorphs present in mineralized organisms, the most soluble, amorphous calcium carbonate (ACC), formed in chitin exoskeletons of some Crustacea, is of particular interest since aqueous stability of isolated ACC is limited to a few hours in the absence of polyanions or magnesium. Here the influence of a selection of biopolymer gels on the mineralization of calcium carbonate is investigated. Mineralization is achieved in all biopolymers tested, but is particularly abundant in collagen hydrogels, in which a significant proportion of the calcium carbonate (≈18%) is found to be amorphous. In dense collagen gels, this amorphous fraction does not crystallize for up to six weeks in deionized water at room temperature. The reason why collagen in particular should stabilize this phase remains obscure, although the results suggest that the fiber diameter, fiber spacing, and the amphoteric nature of collagen fibers are important. Upon immersion in phosphate containing solutions, the calcium carbonate present within the collagen hydrogels is readily converted to carbonated hydroxyapatite, enabling the formation of a stiff bone-like composite containing 78 wt% mineral, essentially equivalent to cortical bone.
机译：碳酸钙是生物来源最丰富的生物矿物质，具有多种纳米和微米尺度的特征。在矿化生物体中存在的稳定性较差的多晶型物中，在一些甲壳纲的几丁质外骨骼中形成的最易溶的无定形碳酸钙（ACC）特别令人关注，因为在没有聚阴离子的情况下，分离出的ACC的水稳定性仅限于数小时或镁。在这里研究了生物聚合物凝胶的选择对碳酸钙矿化的影响。在所有测试的生物聚合物中均实现了矿化作用，但在胶原蛋白水凝胶中尤其丰富，其中发现很大一部分碳酸钙（约18％）是无定形的。在致密的胶原蛋白凝胶中，这种无定形部分在室温下在去离子水中最多不能结晶六周。尽管结果表明胶原纤维的纤维直径，纤维间距和两性性质很重要，但特别是胶原蛋白应稳定该相的原因仍然不清楚。浸入含磷酸盐的溶液中后，存在于胶原蛋白水凝胶中的碳酸钙易于转化为碳酸化的羟基磷灰石，从而能够形成坚硬的骨状复合材料，其中含有78％的矿物质，基本上相当于皮质骨。

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  • 来源
    《Advanced Functional Materials》 |2012年第16期|p.3460-3469|共10页
  • 作者

    David C. Bassett; Benedetto Marelli; Showan N. Nazhat; Jake E. Barmlet;

  • 作者单位

    Faculty of Dentistry McGill University Montreal, QC, H3A 2B2, Canada;

    Department of Mining and Materials Engineering McGill University Montreal, QC, H3A 2B2, Canada;

    Faculty of Dentistry McGill University Montreal, QC, H3A 2B2, Canada,Department of Mining and Materials Engineering McGill University Montreal, QC, H3A 2B2, Canada;

    Faculty of Dentistry McGill University Montreal, QC, H3A 2B2, Canada;

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