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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >The elusive crystal structure of uric acid dihydrate: Implication for epitaxial growth during biomineralization
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The elusive crystal structure of uric acid dihydrate: Implication for epitaxial growth during biomineralization

机译：二水尿酸的难以捉摸的晶体结构：对生物矿化过程中外延生长的影响

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摘要

The crystal structure of the elusive uric acid dihydrate phase, a known component of human pathological biomineralizations, has been investigated by a combination of synchrotron and conventional X-ray diffraction experiments. C5H4N4O3 . 2H(2)O, orthorhombic, Pnab, a = 7.409(1), b = 17.549(3), c = 6.332(1) Angstrom, Z = 4, wR = 0.030 and 0.041 for two independently measured datasets. The molecular packing, encompassing hydrogen-bonded layers of water molecules and statistically disordered organic moieties, fully clarifies on a structural basis the observed epitaxial growth of uric acid dihydrate with associated phases in human stones, such as anhydrous uric acid and whewellite. Synchrotron data confirmed the existence of weak reflections violating the extinction conditions and are interpreted by the presence of short-range ordering of the uric acid molecules at distances of the order of a few adjacent cells.
机译：通过同步加速器和常规X射线衍射实验研究了难以捉摸的尿酸二水合物相（人类病理生物矿化的已知成分）的晶体结构。 C5H4N4O3。 2H（2）O，正交，Pnab，a = 7.409（1），b = 17.549（3），c = 6.332（1）埃，Z = 4，wR = 0.030和0.041对于两个独立测量的数据集。分子堆积包括水分子的氢键合层和统计上无序的有机部分，从结构上充分阐明了在人的结石中观察到的尿酸二水合物及其相关相的外延生长，例如无水尿酸和辉绿矿。同步加速器的数据证实了存在弱光的现象，违反了消光条件，并且被尿酸分子在几个相邻细胞数量级的距离上的短程有序性所解释。

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