Micro-XANES mapping of sulphur and its association with magnesium and phosphorus in the shell of the brachiopod, Terebratulina retusa
Micro-XANES mapping of sulphur and its association with magnesium and phosphorus in the shell of the brachiopod, Terebratulina retusa
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腕足动物壳中硫及其与镁和磷的关联的 Micro-XANES 绘图
DOI：
10.1016/j.chemgeo.2008.05.007
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发表时间：
2008
期刊：
影响因子：
3.9
通讯作者：
Cusack M
中科院分区：
文献类型：
--
作者：
Cusack M
生物矿物是由有机和无机成分组成的天然复合材料。详细了解这两种成分的性质和分布是一个至关重要的要求，以促进我们对生物矿物形成，其材料特性和保存潜力以及环境数据的解释的理解。详细的化学数据对于我们了解这些成分的性质和分布至关重要。微XANES映射在硫K-边缘显示，在腕足动物Terebratulina retusa，硫酸盐浓度较高的外层（初级）比在方解石纤维的第二层。这与较高的镁浓度是一致的。相反，方解石纤维周围的鞘含有硫作为硫醇，证实了蛋白质的存在，而纤维本身中的硫以硫酸盐的形式存在。用Micro-XANES分析T. retusa表明存在有机硫酸盐，而微拉曼光谱证实也存在结构取代的硫酸盐（SSS），尽管在该光谱区域（波数900-1200）进行的半定量拉曼光谱表明存在的硫酸盐处于拉曼光谱的检测阈值。研究了磷在T. retusa与蛋白质的相关性很好，表明在角质膜、方解石纤维周围的鞘以及初级层和次级层之间的界面中存在磷酸化蛋白质。
Biominerals are natural composite materials comprising organic and inorganic components. Detailed knowledge of the nature and distribution of both components is a crucial requirement in order to advance our understanding of biomineral formation, their material properties and preservation potential as well as the interpretation of environmental data. Detailed chemical data are essential for our understanding of the nature and distribution of such components. Micro-XANES mapping at the sulphur K-edge reveals that, in the brachiopod Terebratulina retusa, the sulphate concentration is higher in the outer (primary) layer than in the calcite fibres of the secondary layer. This is co-incident with a higher magnesium concentration. In contrast, the sheaths surrounding the calcite fibres contain sulphur as thiol, confirming the presence of protein while, the sulphur within the fibres themselves, occurs as sulphate. Micro-XANES analysis of the insoluble organic extract from T. retusa indicates the presence of organic sulphate while Micro-Raman spectroscopy confirms that structurally substituted sulphate (SSS) is also present although semi-quantitative Raman spectroscopy carried out in this spectral region (wavenumbers 900–1200) indicates that the sulphate present is at the threshold of detection by Raman spectroscopy. The distribution of phosphorus in the shell of T. retusa correlates well with that of protein indicating the presence of phosphorylated proteins in the periostracum, the sheaths surrounding the calcite fibres and the interface between the primary and secondary layer.
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作者：
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通讯作者：
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影响因子：
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DOI：
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发表时间：
2007
期刊：
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DOI：
--
发表时间：
1987
期刊：
影响因子：
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作者：
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作者：
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