Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins

被引：22

作者：

Lee, Eunsook ^{[1
]}

Kim, D. H. ^{[1
]}

Hwang, Jihoon ^{[1
]}

Lee, Kiho ^{[1
]}

Yoon, Sungwon ^{[1
]}

Suh, B. J. ^{[1
]}

Kim, Kyung Hyun ^{[2
]}

Kim, J. -Y. ^{[3
]}

Jang, Z. H. ^{[4
]}

Kim, Bongjae ^{[5
]}

Min, B. I. ^{[5
]}

Kang, J. -S. ^{[1
]}

机构：

[1] CUK, Dept Phys, Puchon 420743, South Korea

[2] Korea Univ, Dept Biotechnol & Bioinformat, Chungnam 339700, South Korea

[3] POSTECH, PAL, Pohang 790784, South Korea

[4] Kookmin Univ, Dept Phys, Seoul 136702, South Korea

[5] POSTECH, Dept Phys, Pohang 790784, South Korea

来源：

APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 13期

关键词：

TETRAHEDRALLY COORDINATED FE(III); TRANSITION-METAL COMPOUNDS; MAGNETIC-PROPERTIES; CIRCULAR-DICHROISM; CRYSTAL-STRUCTURE; ABSORPTION;

D O I：

10.1063/1.4801310

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpf's) has been determined by employing soft x-ray absorption spectroscopy and soft x-ray magnetic circular dichroism. Valence states of Fe ions are nearly trivalent in all Hpf's, indicating that the amount of magnetite (Fe3O4) is negligible. With increasing filling of Fe ions, the local configurations of Fe3+ ions change from the mixture of the tetrahedral and octahedral symmetries to the octahedral symmetry. These results demonstrate that the biomineralization of the ferritin core changes from maghemite-like (gamma-Fe2O3) formation to hematite-like (alpha-Fe2O3) formation with increasing Fe content. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4801310]

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页数：4

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