Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation

• Authors: M. Molčan , A. Hashim , J. Kováč , M. Rajňák , P. Kopčanský , M. Makowski , H. Gojzewski , M. Molokáč , L. Hvizdák , M. Timko
• Languages of publication: EN

Abstracts

EN

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 (Fe_{3}O_{4}) or greigite (Fe_{3}S_{4}) 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.

Keywords

EN

81.07.-b; 75.60.-d; 87.50.Y-; 68.37.-d

Discipline

• 75.60.-d: Domain effects, magnetization curves, and hysteresis(for dynamics of domain structures, see 75.78.Fg)
• 81.07.-b: Nanoscale materials and structures: fabrication and characterization(for structure of nanoscale materials, see 61.46.-w; for nanostructured materials in electrochemistry, see 82.45.Yz; see also 62.23.-c Structural classes of nanoscale systems in mechanical properties of condensed matter)
• 68.37.-d: Microscopy of surfaces, interfaces, and thin films
• 87.50.Y-: Biological effects of acoustic and ultrasonic energy

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 198-199

Dates

published

2014-07

Contributors

author

M. Molčan

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

author

A. Hashim

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

author

M. Rajňák

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

author

M. Makowski

• Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland
• Max Planck Institute for Polymer Research, Ackermannweg 10, 55-128 Mainz, Germany

author

H. Gojzewski

• Institute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland
• Max Planck Institute of Colloids and Interfaces, Department of Interfaces, Wissenschaftspark Potsdam-Golm, Am Mühlenberg 1 OT Golm, 14476 Potsdam, Germany

author

M. Molokáč

• Institute of Geotourism, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

L. Hvizdák

• Institute of Geotourism, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.126.198