Characterization of magnetosomes after exposure to the effect of the Sonication and ultracentrifugation

M. Molčan*, A. Hashim, J. Kováč, M. Rajňák, P. Kopčanský, M. Makowski, H. Gojzewski, M. Molokác, L. Hvizdák, M. Timko

*Corresponding author for this work

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Abstract

Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite (Fe3O4) or greigite (Fe 3S4) crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.

Original languageEnglish
Pages (from-to)198-199
Number of pages2
JournalActa physica polonica A
Volume126
Issue number1
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes
Event15th Czech and Slovak Conference on Magnetism 2013 - Košice, Slovakia
Duration: 17 Jun 201321 Jun 2013
Conference number: 15

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    Molčan, M., Hashim, A., Kováč, J., Rajňák, M., Kopčanský, P., Makowski, M., ... Timko, M. (2014). Characterization of magnetosomes after exposure to the effect of the Sonication and ultracentrifugation. Acta physica polonica A, 126(1), 198-199. https://doi.org/10.12693/APhysPolA.126.198