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首页> 外文期刊>Advanced Functional Materials >Protein-Mediated Synthesis of Uniform Superparamagnetic Magnetite Nanocrystals
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Protein-Mediated Synthesis of Uniform Superparamagnetic Magnetite Nanocrystals

机译：蛋白质介导的均匀超顺磁性磁铁矿纳米晶体的合成

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摘要

Magnetite nanocrystals are synthesized in the presence of a recombinant Mms6 protein thought to be involved in the biominer-alization of bacterial magnetite magnetosomes, the mammalian iron-storage protein, ferritin, and two proteins not known to bind iron, lipocalin (Lcn2) and bovine serum albumin (BSA). To mimic the conditions at which magnetite nanocrystals are formed in magnetotactic bacteria, magnetite synthesis is performed in a polymeric gel to slow down the diffusion rates of the reagents. Recombinant Mms6 facilitates formation of ca. 30 nm single-domain, uniform magnetite nanocrystals in solution, as verified by using transmission electron microscopy analysis and magnetization measurements. The nanocrystals formed in the presence of ferritin. Lcn2, and BSA, do not exhibit the uniform sizes and shapes observed for those produced in the presence of Mms6. Mms6-derived magnetite nanoparticles show the largest magnetization values above the blocking temperature, as well as the largest magnetic susceptibility compared to those of the nanomaterials synthesized with other proteins. The latter is indicative of a substantial effective magnetic moment per particle, which is consistent with the presence of magnetite with a well-defined crystalline structure. The combination of electron microscopy analysis and magnetic measurements confirms our hypothesis that Mms6 promotes the shape-selective formation of uniform superparamagnetic nanocrystals. This provides a unique bioinspired route for synthesis of uniform magnetite nanocrystals.
机译：在重组Mms6蛋白的存在下合成了磁铁矿纳米晶体，该重组Mms6蛋白被认为与细菌磁铁矿磁小体的生物矿化有关，它是哺乳动物的铁存储蛋白，铁蛋白和两种未知的结合铁，脂蛋白（Lcn2）和牛的蛋白。血清白蛋白（BSA）。为了模拟在趋磁细菌中形成磁铁矿纳米晶体的条件，在聚合物凝胶中进行磁铁矿合成以减慢试剂的扩散速度。重组Mms6促进ca的形成。溶液中的30 nm单畴，均匀磁铁矿纳米晶体，已通过透射电子显微镜分析和磁化强度测量证实。在铁蛋白存在下形成纳米晶体。 Lcn2和BSA对在Mms6存在下产生的尺寸和形状没有显示出相同的大小和形状。与其他蛋白质合成的纳米材料相比，Mms6衍生的磁铁矿纳米颗粒在高于封闭温度的情况下显示出最大的磁化值，并且具有最大的磁化率。后者表示每个颗粒有相当大的有效磁矩，这与具有明确定义的晶体结构的磁铁矿的存在是一致的。电子显微镜分析和磁测量的结合证实了我们的假设，即Mms6促进了均匀超顺磁性纳米晶体的形状选择形成。这为合成均匀磁铁矿纳米晶体提供了独特的生物启发途径。

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