Communications - Scientific Letters of the University of Zilina 2014, 16(1):26-32 | DOI: 10.26552/com.C.2014.1.26-32

Magnetosomes - Bacterial Magnetic Nanoparticles

Matus Molcan1, Anezka Hashim1, Jozef Kovac1, Hubert Gojzewski2, Andrzej Skumiel3, Francois Royer4, Damien Jamon4, Peter Kopcansky1, Milan Timko1
1 Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
2 Institute of Physics, Poznan University of Technology, Poznan, Poland and Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
3 Faculty of Physics, Adam Mickiewicz University, Poznan, Poland
4 Universite de Lyon, Saint Etienne, France and DIOM EA 3523, Universite de Saint Etienne, Saint Etienne, France

The magnetic properties, magneto-optical effects and hyperthermia effect were studied in solution of magnetosomes extracted from cultivated bacteria Magnetospirillum sp. AMB-1. The properties of magnetosomes were changed using different conditions during synthesis and by modification of particles after synthesis by using sonication and ultracentrifugation methods. It was shown that adding a higher amount of Wolfe's vitamin solution (WVS) or ferric quinate (FQ) cause increase of the mean diameter from 47 nm (normal condition) up to 52 nm and 58 nm respectively. Hyperthermic measurements were performed for three types of magnetosome samples: (I) M - not influenced by separation method (long - chains magnetosomes), (II) UM - after centrifugation procedure, and (III) SM - after centrifugation procedure including sonication. The Specific Absorption Rate (SAR) decreased depending on chains shortening and decrease in hysteresis too. The SAR values were 1083, 934 or 463 W/g for the sample M, UM and SM, respectively.

Keywords: nanoscale materials and structures, hysteresis, ultrasound effects on biological systems, electron microscopy. PACS numbers: 81.07.-b, 75.60.-d, 87.50.Y-, 68.37.-d

Published: February 28, 2014  Show citation

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Molcan, M., Hashim, A., Kovac, J., Gojzewski, H., Skumiel, A., Royer, F., ... Timko, M. (2014). Magnetosomes - Bacterial Magnetic Nanoparticles. Communications - Scientific Letters of the University of Zilina, 16(1), 26-32. doi: 10.26552/com.C.2014.1.26-32
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