Chemistry of bone mineral, based on the hypermineralized rostrum of the beaked whale Mesoplodon densirostris.
Chemistry of bone mineral, based on the hypermineralized rostrum of the beaked whale Mesoplodon densirostris.
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DOI：
10.2138/am.2014.4571
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发表时间：
2014-04
期刊：
影响因子：
--
通讯作者：
Pasteris JD
中科院分区：
文献类型：
--
作者：
Li Z;Pasteris JD
碳酸盐取代羟基磷灰石是骨中的无机成分。骨微晶的纳米尺寸及其与近等体积的胶原纤维的交织使得骨矿物质的化学分析极其困难。通常可用的少数化学分析是对灰化的骨进行的，除了矿物质，还包括胶原蛋白的化学残留物。在本研究中，我们选择了鲸鱼Mesoplodon densirostris的喙。其矿物质含量高达96重量%，使其成为追求骨内生物磷灰石化学的理想材料。对这种最致密的骨骼材料进行了体分析（X射线荧光、热重分析和碳分析）、点分析和元素绘图（电子显微探针）。其生物磷灰石的平均碳酸盐含量约为8wt%，平均Ca/P原子比为1.7。与典型骨材料一样，喙部显示极低浓度的微量元素（Al、Si、Fe、Ti和Sr）和一些微量元素（K和Cl）。除少数维管孔和血管周围外，在喙部截面内典型的矿物为主区域中，元素分布均匀。电子探针点分析和X射线荧光体分析之间的良好相关性表明后者是骨矿物的一个有用的化学模型。体分析表明，喙中的生物磷灰石的平均组成为（Ca8.40Mg0.20Na0.54）[（PO 4）4.87（CO 3）1.13]（OH）0.87。
Carbonate-substituted hydroxylapatite is the inorganic component in bone. The nanometer size of bone crystallites and their interweaving with subequal volumes of collagen fibrils make the chemical analysis of the bone mineral extremely difficult. The few chemical analyses that are available commonly were made on ashed bone, which, in addition to mineral, also includes chemical residues of collagen. For the present study, we chose the rostrum of the whale Mesoplodon densirostris. Its mineral content of up to 96 wt% makes it an ideal material for pursuing the chemistry of bioapatite within bone. Both bulk (X-ray fluorescence, thermogravimetry, and carbon analysis) and point analyses and element mapping (electron microprobe) were applied to this densest of bone materials. Its bioapatite has an average carbonate content of ~8 wt% and an average Ca/P atomic ratio of 1.7. The rostrum shows extremely low-concentration trace elements (Al, Si, Fe, Ti and Sr) and some minor elements (K and Cl) as in typical bone materials. Homogeneity of elemental distribution is demonstrated in typical mineral-dominated areas within the rostrum sections except around a few vascular holes and vessels. The very good correlation between electron microprobe point analyses and the XRF bulk analyses of the rostrum indicate the latter to be a useful chemical model of bone mineral. The bulk analysis shows that the bioapatite in the rostrum has an average composition of (Ca8.40Mg0.20Na0.54)[(PO4)4.87(CO3)1.13] (OH)0.87.
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影响因子：
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作者：
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