Highest levels of Cu, Mn and Co doped into nanomagnetic magnetosomes through optimized biomineralisation

Tanaka, Masayoshi; Brown, Rosemary; Hondow, Nicole; Arakaki, Atsushi; Matsunaga, Tadashi; Staniland, Sarah S.

doi:10.1039/c2jm31520c

Cited by 42 publications

(54 citation statements)

References 17 publications

(19 reference statements)

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“…Compared with trace cobalt (approx. 1-3%) doping in magnetosome magnetite in previous studies [11,13] and approximately 4-6% in the present one, the amounts of cobalt doped in extracellular magnetite can be much larger, e.g. the atom ratio of Co/Fe can reach up to approximately Figure 6.…”

Section: Discussionmentioning

confidence: 87%

“…magnetofossils) from ancient sediments or rocks [26,45]. On the other hand, to tune their magnetism suitable for various applications, great efforts have been made over the last decade in incorporating other transition metals such as Co, Mn, Zn, Cu and Ni into magnetosomes [11,13,14]. Very recently, Amor et al [46] tested the incorporation of 34 trace elements including some transition, light and heavy metals in magnetosomes produced by M. magneticum AMB-1.…”

Section: Discussionmentioning

confidence: 99%

“…They have shown that the presence of cobalt increases the coercivity of the magnetosomes by 36-45%, depending on the bacterial strains and the cobalt contents. Recently, Tanaka et al [11] further increased the levels of cobalt doping approximately up to 3.0% by increasing the concentration of cobalt ions in the initial culture medium. It has been evidenced that the presence of cobalt in the magnetosomes significantly increases the magneto-crystalline anisotropy constant and the magnetic hysteresis, and therefore increases the heating efficiency for applications in alternating magnetic field cancer therapy [29].…”

Section: Introductionmentioning

confidence: 99%

“…However, these methods often involve high temperature with toxic solvents resulting in high environmental and energy costs. Recently, synthesis of MNPs by biotic processes such as microbial biomineralization [10][11][12][13][14][15][16] or biocatalysis by biomolecules [17 -23] has attracted a great interest in producing novel MNPs with high quality and biocompatibility under environment friendly conditions (e.g. at room temperature and ambient pressure and in toxic-free solutions).…”

Section: Introductionmentioning

confidence: 99%

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Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element- and site-specific X-ray magnetic circular dichroism analyses

Menguy

Arrio

et al. 2016

J. R. Soc. Interface.

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ResearchCite this article: Li J et al. 2016 Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element-and site-specific X-ray magnetic circular dichroism analyses. J. R. Soc. The biomineralization of magnetite nanocrystals (called magnetosomes) by magnetotactic bacteria (MTB) has attracted intense interest in biology, geology and materials science due to the precise morphology of the particles, the chain-like assembly and their unique magnetic properties. Great efforts have been recently made in producing transition metal-doped magnetosomes with modified magnetic properties for a range of applications. Despite some successful outcomes, the coordination chemistry and magnetism of such metal-doped magnetosomes still remain largely unknown. Here, we present new evidences from X-ray magnetic circular dichroism (XMCD) for element-and site-specific magnetic analyses that cobalt is incorporated in the spinel structure of the magnetosomes within Magnetospirillum magneticum AMB-1 through the replacement of Fe 2þ ions by Co 2þ ions in octahedral (O h ) sites of magnetite. Both XMCD at Fe and Co L 2,3 edges, and energy-dispersive X-ray spectroscopy on transmission electron microscopy analyses reveal a heterogeneous distribution of cobalt occurring either in different particles or inside individual particles. Compared with nondoped one, cobalt-doped magnetosome sample has lower Verwey transition temperature and larger magnetic coercivity, related to the amount of doped cobalt. This study also demonstrates that the addition of trace cobalt in the growth medium can significantly improve both the cell growth and the magnetosome formation within M. magneticum AMB-1. Together with the cobalt occupancy within the spinel structure of magnetosomes, this study indicates that MTB may provide a promising biomimetic system for producing chains of metal-doped single-domain magnetite with an appropriate tuning of the magnetic properties for technological and biomedical applications.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element- and site-specific X-ray magnetic circular dichroism analyses

Menguy

Arrio

et al. 2016

J. R. Soc. Interface.

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“…However, the degree of magnetite chemical purity in these previous studies was estimated by energy dispersive x-ray spectroscopy (EDXS) coupled with transmission electron microscopy, which is usually limited to the quantification of relatively elevated elemental concentrations, typically higher than 0.1-1% (22). Moreover, EDXS analyses have been used to evaluate single-element incorporations into magnetite crystals produced by MTB (23)(24)(25)(26). These experiments tested only high Significance Magnetite precipitates through either abiotic or biotic processes.…”

mentioning

confidence: 99%

Chemical signature of magnetotactic bacteria

Amor

Busigny

Durand-Dubief

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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There are longstanding and ongoing controversies about the abiotic or biological origin of nanocrystals of magnetite. On Earth, magnetotactic bacteria perform biomineralization of intracellular magnetite nanoparticles under a controlled pathway. These bacteria are ubiquitous in modern natural environments. However, their identification in ancient geological material remains challenging. Together with physical and mineralogical properties, the chemical composition of magnetite was proposed as a promising tracer for bacterial magnetofossil identification, but this had never been explored quantitatively and systematically for many trace elements. Here, we determine the incorporation of 34 trace elements in magnetite in both cases of abiotic aqueous precipitation and of production by the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1. We show that, in biomagnetite, most elements are at least 100 times less concentrated than in abiotic magnetite and we provide a quantitative pattern of this depletion. Furthermore, we propose a previously unidentified method based on strontium and calcium incorporation to identify magnetite produced by magnetotactic bacteria in the geological record.

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Genetic Tuning of Iron Oxide Nanoparticle Size, Shape, and Surface Properties in Magnetospirillum magneticum

Furubayashi

Wallace

González

et al. 2020

Adv Funct Materials

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Different applications require iron oxide nanoparticles (IONPs) of varying size, shape, crystallinity, and surfaces that can be controlled through the synthesis reaction conditions. Under ambient conditions, Magnetospirillum magneticum AMB‐1 builds uniform Fe3O4 IONPs with shapes and crystal forms difficult to achieve with chemical synthesis. Genetic engineering can be used to change their properties, but there are few tools to fine‐tune expression over a wide range. To this end, ribosome binding sites, minimal constitutive promoters, and inducible systems (IPTG, aTc, and OC6) with large dynamic range are designed. These are used to control M. magneticum genes that affect IONP properties, including size (mamC), morphology (mms6), chain length (mamK), and surface coating (mamC fusions). These systems increase the fraction of IONPs that are less than 30 nm, produce rounded particles, and lead to the production of intracellular chains with 24 or more IONPs. In addition, the R5 peptide from diatoms is found to silica coat the surface of metal oxide nanoparticles (Fe, Ti, Ta, Hf) and can be genetically directed to the IONP surface. This work demonstrates the genetic control of IONP properties, but also highlights the robustness of the system, which complicates genetic engineering to produce radically different particles and structures.

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Highest levels of Cu, Mn and Co doped into nanomagnetic magnetosomes through optimized biomineralisation

Cited by 42 publications

References 17 publications

Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element- and site-specific X-ray magnetic circular dichroism analyses

Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element- and site-specific X-ray magnetic circular dichroism analyses

Chemical signature of magnetotactic bacteria

Genetic Tuning of Iron Oxide Nanoparticle Size, Shape, and Surface Properties in Magnetospirillum magneticum

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