Bio-mineralisation, characterization, and stability of calcium carbonate containing organic matter.
Bio-mineralisation, characterization, and stability of calcium carbonate containing organic matter.
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含有机质碳酸钙的生物矿化、表征和稳定性
DOI：
10.1039/d1ra00615k
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发表时间：
2021-04-15
期刊：
影响因子：
3.9
通讯作者：
Lian B
中科院分区：
文献类型：
--
作者：
Liu R;Huang S;Zhang X;Song Y;He G;Wang Z;Lian B
生物碳酸钙中有机质的组成长期以来一直是一个谜，其作用也没有得到足够的重视。本研究的目的是阐明生物矿化和稳定性的无定形碳酸钙（ACC）和球文石含有有机质，作为诱导枯草芽孢杆菌。结果表明，该菌能以其细胞为模板，诱导CaCO 3形成生物ACC（BACC）或生物球霰石（BV）等多种结构形式，其分泌的碳酸酐酶在CaCO 3矿化过程中起着重要作用。研究了Ca 2+浓度对碳酸钙晶体结构的影响，当CaCl 2浓度从0.1%（m/v）增加到0.8%（m/v）时，碳酸钙转变为多晶球文石。XRD结果表明，ACC和球文石在空气或去离子水中具有良好的稳定性一年，甚至当加热到200 °C或300 °C持续2小时。红外光谱分析结果表明，生物ACC和球文石中有机质含量分别为39.67wt%和28.47wt%。仿生矿化实验结果表明，细菌代谢分泌的蛋白质可能倾向于抑制方解石的形成，而多糖可能倾向于促进球文石的形成。我们的研究结果推进了我们对碳酸钙家族的了解，对未来有机碳酸钙复合物的研究有价值。
The composition of organic matter in biogenic calcium carbonate has long been a mystery, and its role has not received sufficient attention. This study is aimed at elucidating the bio-mineralisation and stability of amorphous calcium carbonate (ACC) and vaterite containing organic matter, as induced by Bacillus subtilis. The results showed that the bacteria could induce various structural forms of CaCO3, such as biogenic ACC (BACC) or biogenic vaterite (BV), using the bacterial cells as their template, and the carbonic anhydrase secreted by the bacteria plays an important role in the mineralisation of CaCO3. The effects of Ca2+ concentration on the crystal structure of CaCO3 were ascertained; when the amount of CaCl2 increased from 0.1% (m/v) to 0.8% (m/v), the ACC was transformed to polycrystalline vaterite. The XRD results demonstrated that the ACC and vaterite have good stability in air or deionised water for one year, or even when heated to 200 °C or 300 °C for 2 h. Moreover, the FTIR results indicated that the BACC or BV is rich in organic matter, and the contents of organic matter in biogenic ACC and vaterite are 39.67 wt% and 28.47 wt%, respectively. The results of bio-mimetic mineralisation experiments suggest that the protein secreted by bacterial metabolism may be inclined to inhibit the formation of calcite, while polysaccharide may be inclined to promote the formation of vaterite. Our findings advance our knowledge of the CaCO3 family and are valuable for future research into organic-CaCO3 complexes.
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