Abstract
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.
Highlights
Magnetotactic bacteria are microorganisms which belong to heterogeneous group of Gram-negative bacteria with diverse morphologies and habitats
The size distribution of magnetosomes obtained by cultivation at normal culture (NP), containing higher ferric quinate (FQ) amount and higher Wolfe’s vitamin solution (WVS) amount are given in Fig. 3a-c, respectively
The chains of magnetite behave superparamagnetically for a sample cultivated at normal condition and display ferromagnetic properties at room temperature for samples WVS and FQ
Summary
Magnetotactic bacteria are microorganisms which belong to heterogeneous group of Gram-negative bacteria with diverse morphologies and habitats. They are a diverse group of aquatic prokaryotes [1]. They create in their body the chains of magnetic crystals called magnetosomes [2]. Bacterial magnetic particles - magnetosomes can be distinguished by the regular morphology and the presence of a thin organic membrane enveloping crystals from biologically formed magnetite. Magnetosome formation is achieved by a mineralization process with biological control over the accumulation of iron and the deposition of the mineral particle with specific size and orientation within a membrane vesicle at specific locations in the cell [3]
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