Biogenic fish-gut calcium carbonate is a stable amorphous phase in the gilt-head seabream, Sparus aurata.

Biogenic fish-gut calcium carbonate is a stable amorphous phase in the gilt-head seabream, Sparus aurata.
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DOI:
10.1038/srep01700
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Fine, Maoz
Fine, Maoz
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Foran, Elizabeth;Weiner, Steve;Fine, Maoz

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海洋中碳酸钙(CaCO3)的主要来源来自于钙化的浮游生物的外壳,但大量的CaCO3也在鱼肠中产生。CaCO3的沉淀有助于鱼类肠道水的吸收,并有助于全身Ca2+的体内平衡。在这里,我们报告的产品中形成的肠腔的镀金头海鸟,鲷,是一种无定形碳酸钙(ACC)相。通过红外光谱和扫描电子显微镜的研究表明,S。在整个肠道中,金黄色保持为稳定的无定形相。此外,肠道沉积物中含有高达54摩尔%的Mg 2+,最高的浓度尚未在生物成因的ACC.Mg是最有可能负责稳定这种固有的不稳定mineral.The鱼碳酸盐也显示出初始快速溶解时,暴露于海水中,表现出显着增加碳酸盐浓度。 
The main source of calcium carbonate (CaCO3) in the ocean comes from the shells of calcifying planktonic organisms, but substantial amounts of CaCO3 are also produced in fish intestines. The precipitation of CaCO3 assists fish in intestinal water absorption and aids in whole body Ca2+ homeostasis. Here we report that the product formed in the intestinal lumen of the gilt-head seabream, Sparus aurata, is an amorphous calcium carbonate (ACC) phase. With FTIR spectroscopy and SEM imaging, our study shows that the fish-derived carbonates from S. aurata are maintained as a stable amorphous phase throughout the intestinal tract. Moreover, intestinal deposits contained up to 54 mol% Mg2+, the highest concentration yet reported in biogenic ACC. Mg is most likely responsible for stabilizing this inherently unstable mineral. The fish carbonates also displayed initial rapid dissolution when exposed to seawater, exhibiting a significant increase in carbonate concentration.
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