Properties of Magnetite Nanoparticles Produced by Magnetotactic Bacteria  

作　　者：李文兵 YU Longjiang ZHOU Pengpeng WANG Guanghua XU Binfu CHENG Zhengzai 徐卫国 

机构地区：[1]School of Chemical Engineering and Technology, Wuhan University of Science and Technology [2]College of Life Science & Technology, Huazhong University of Science & Technology [3]College of Physics &Technology, Wuhan University [4]Department of Orthopaedics, Tongji Hospital Affilated to Tongji Medical College, Huazhong University of Science and Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第6期1317-1322,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Specialized Research Fund for Doctoral Program of Higher Education of China(No.20114219110002);the Natural Science Foundation of Hubei Provice(Nos.2014CFB810 and 2014CFB812);the Educational Department of Hubei Province of China(No.D20131107)

摘　　要：The magnetic nanoparticles（magnetite） were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer’s equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio（（δFC / δZFC = 4） supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism.The magnetic nanoparticles（magnetite） were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer’s equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio（（δFC / δZFC = 4） supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism.

关 键 词：biogenic magnetite magnetotactic bacteria property magnetosome biomineralization 

分 类 号：Q939.9[生物学—微生物学]