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

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

来源：Applied Physics Letters, 2013, 102(13): 133703.

DOI：10.1063/1.4801310

The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpf%26apos;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%26apos;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.

• 出版日期2013-4-1