Artificial Magnetic Bacteria: Living Magnets at Room Temperature
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AutorMartín Marcos, Miguel Ángel; Carmona Rodríguez-Acosta, Fernando; Cuesta Martos, Rafael; Rondón, Deyanira; Gálvez Rodríguez, Natividad; Domínguez Vera, José Manuel
Wiley - VCH Verlag GmbH and Co. KGaA
Metal nanoparticlesMagnetic nanoparticlesBacteriaLiving magnetsBiomimetics
Martín Marcos, M.A.; et al. Artificial Magnetic Bacteria: Living Magnets at Room Temperature. Advanced Functional Materials, 24(23): 3489-3493 (2014). [http://hdl.handle.net/10481/47232]
PatrocinadorThis work was funded by Biosearch S. A. (POSTBIO project-Agency for Innovation and Development of Andalucia IDEA) and by MINECO and FEDER (project CTQ2012–32236).
Biogenic magnetite is a fascinating example of how nature can generate functional magnetic nanostructures. Inspired by the magnetic bacteria, an attempt is made to mimic their magnetic properties, rather than their structures, to create living magnets at room temperature. The non-magnetic probiotic bacteria Lactobacillus fermentum and Bifidobacteria breve are used as bioplatforms to densely arrange superparamagnetic nanoparticles on their external surfaces, thus obtaining the artificial magnetic bacteria. Magnetic probiotic bacteria can be produced by using superparamagnetic maghemite nanoparticles assembled at their surfaces. They present a collective ferromagnetic phase at room temperature. The blocking temperature of these maghemite nanoparticles increases more than 100 K when assembled at the artificial magnetic bacteria.