| 纳米磁铁矿链的仿生合成及其生物矿化意义 |
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| 引用本文： | 曲晓飞,姚奇志,周根陶.纳米磁铁矿链的仿生合成及其生物矿化意义[J].高校地质学报,2011,17(1):66-75. |
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| 作者姓名： | 曲晓飞 姚奇志 周根陶 |
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| 作者单位： | 中国科学院 壳幔物质与环境重点实验室；中国科学技术大学 地球和空间科学学院 |
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| 基金项目： | 国家重点基础研究发展计划资助项目，国家自然科学基金，中国科学院知识创新工程重要方向性项目，高等学校博士学科点专项科研基金 |
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| 摘 要： | 本文在不使用任何蛋白质或生物分子的情况下，以四方针铁矿和二价铁离子为铁源仿生合成磁铁矿纳米颗粒。实验
结果表明，在弱碱性条件下，合成的磁铁矿颗粒为35 nm左右的近似立方体，而且这些颗粒能够自发的定向排列，形成类
似趋磁细菌体内的磁小体链状结构。作者认为，由于磁铁矿晶体存在着固有的磁偶极，晶体之间的磁偶极作用力驱动着磁
铁矿颗粒自发组装成定向排列的链状结构。这就揭示了在趋磁细菌体内磁小体的矿化及组装链形成过程中，除了生物蛋白
影响外，磁小体颗粒之间的磁偶极吸引作用也可能是一个重要因素。生物蛋白和晶体化学因素可能在趋磁细菌体内生物矿
化过程中协同起作用。
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| 关 键 词： | 磁铁矿 磁小体 趋磁细菌 生物矿化 |
| 收稿时间： | 2010-11-29 |
Biomimetic Formation of Nanomagnetite Chain: Implication for Magnetosome Mineralization |
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| QU Xiao-fei,YAO Qi-zhi,ZHOU Gen-tao.Biomimetic Formation of Nanomagnetite Chain: Implication for Magnetosome Mineralization[J].Geological Journal of China Universities,2011,17(1):66-75. |
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| Authors: | QU Xiao-fei YAO Qi-zhi ZHOU Gen-tao |
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| Institution: | CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei |
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| Abstract: | Oriented chains of magnetite (Fe3O4) nanoparticles, similar to the magnetosome chains in magnetotactic bacteria (MTB),
have been synthesized by using akaganeite (β-FeOOH) and ferrous ions as iron species through a biomimetic method without
protein or biomolecule. A detailed study by means of XRD, Micro-Raman spectrometer, TEM, SEM and HRTEM shows that the
oriented chain is self-assembled by roughly cuboidal magnetite crystals, and these cuboidal nanoparticles are connected, face
to face, with {100} or {111} facets. Based on the intrinsic dipolar structure, a magnetic dipole-dipole interaction mechanism is
proposed for formation of magnetite chains. Our results suggest that in magnetotactic bacteria, except for the biologic factors, the
dipolar interaction among magnetosomes may be a potential candidate for the organization of magnetosomes into the chains. It
appears that biological and crystallochemical factors cooperate in the magnetosome mineralization in magnetotactic bacteria. |
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| Keywords: | magnetite magnetosome magnetotactic bacteria biomineralization |
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