DataVXJournal of Nanoparticle ResearchPaper
journal article·2021-02Open access

Maghemite nanoparticles coated by methacrylamide-based polymer for magnetic particle imaging

Vít Herynek, Michal Babič, Ondřej Kaman, Hana Charvátová, Mariana Veselá, Oliver Buchholz, Magda Vosmanská, Denisa Kubániová, Jaroslav Kohout, Ulrich G. Hofmann, Luděk Šefc

Journal of Nanoparticle Research· Volume 23· Issue 2
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Abstract

Abstract A wise selection of tracers is critical for magnetic particle imaging (MPI). Most of the current tracers are based on superparamagnetic iron oxide nanoparticles (SPIONs) with a suitable coating. We prepared maghemite cores (γ-Fe2O3) by coprecipitation of Fe(II) and Fe(III) salts with ammonium hydroxide followed by oxidation with hydrogen peroxide and stabilization as an anionic (γ-Fe2O3⊖) or cationic colloid (γ-Fe2O3⨁). The cores were coated by poly(N-(2-hydroxypropyl)methacrylamide)-co-N-[2-(hydroxyamino)-2-oxo-ethyl]-2-methyl-prop-2-enamide. The particles were characterized by dynamic light scattering, transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, tested in vitro in a field-free point MPI scanner, and compared to nanoparticles prepared by oxidation with sodium hypochlorite and to the commercially available Resovist®. The cores had an average diameter of 8.0 nm (γ-Fe2O3⨁) and 8.7 nm (γ-Fe2O3⊖); the hydrodynamic diameter was 88 nm. Zeta potential values for both positively charged (+52 mV) and negatively charged particles (–60 mV) provided for good colloidal stabilization. Spinel structure of maghemite was confirmed by Mössbauer spectroscopy. The uncoated γ-Fe2O3⨁ particles yielded an MPI signal lower (by 16 %) than Resovist; the coated ones reached 88 % of the Resovist signal. Anionic γ-Fe2O3⊖ particles reached a higher (uncoated particles, by 15 %) or comparable (coated ones) signal relative to Resovist with a substantially lower signal dispersion. Control particles prepared by oxidation with sodium hypochlorite scored the weakest results. To conclude, a suitable size, narrow size distribution, and colloidal stability predispose the synthetized particles for use as a tracer for MPI. The anionic particles provided a higher signal with a lower dispersion than commercial tracers.
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Research context

PolymersNanomaterials

OpenAlex topics: Characterization and Applications of Magnetic Nanoparticles · Microfluidic and Bio-sensing Technologies · Geomagnetism and Paleomagnetism Studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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