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

Eunsook Lee; D. H. Kim; Jihoon Hwang; Kiho Lee; Sungwon Yoon; B. J. Suh; Kyung Hyun Kim; J. Y. Kim; Z. H. Jang; Bongjae Kim; B. I. Min; J. S. Kang

doi:10.1063/1.4801310

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

Eunsook Lee, D. H. Kim, Jihoon Hwang, Kiho Lee, Sungwon Yoon, B. J. Suh, Kyung Hyun Kim, J. Y. Kim, Z. H. Jang, Bongjae Kim, B. I. Min, J. S. Kang

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Abstract

The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpfs) 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 Hpfs, indicating that the amount of magnetite (Fe₃O₄) is negligible. With increasing filling of Fe ions, the local configurations of Fe 3 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 (γ-Fe₂O₃) formation to hematite-like (α-Fe₂O₃) formation with increasing Fe content.

Original language	English
Article number	133703
Journal	Applied Physics Letters
Volume	102
Issue number	13
DOIs	https://doi.org/10.1063/1.4801310
State	Published - 1 Apr 2013

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title = "Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins",

abstract = "The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpfs) 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 Hpfs, indicating that the amount of magnetite (Fe3O4) is negligible. With increasing filling of Fe ions, the local configurations of Fe 3 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 (γ-Fe2O3) formation to hematite-like (α-Fe2O3) formation with increasing Fe content.",

author = "Eunsook Lee and Kim, {D. H.} and Jihoon Hwang and Kiho Lee and Sungwon Yoon and Suh, {B. J.} and {Hyun Kim}, Kyung and Kim, {J. Y.} and Jang, {Z. H.} and Bongjae Kim and Min, {B. I.} and Kang, {J. S.}",

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doi = "10.1063/1.4801310",

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T1 - Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins

AU - Lee, Eunsook

AU - Kim, D. H.

AU - Hwang, Jihoon

AU - Lee, Kiho

AU - Yoon, Sungwon

AU - Suh, B. J.

AU - Hyun Kim, Kyung

AU - Kim, J. Y.

AU - Jang, Z. H.

AU - Kim, Bongjae

AU - Min, B. I.

AU - Kang, J. S.

PY - 2013/4/1

Y1 - 2013/4/1

N2 - The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpfs) 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 Hpfs, indicating that the amount of magnetite (Fe3O4) is negligible. With increasing filling of Fe ions, the local configurations of Fe 3 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 (γ-Fe2O3) formation to hematite-like (α-Fe2O3) formation with increasing Fe content.

AB - The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpfs) 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 Hpfs, indicating that the amount of magnetite (Fe3O4) is negligible. With increasing filling of Fe ions, the local configurations of Fe 3 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 (γ-Fe2O3) formation to hematite-like (α-Fe2O3) formation with increasing Fe content.

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

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