T2- and T1 relaxivities and magnetic hyperthermia of iron-oxide nanoparticles combined with paramagnetic Gd complexes


The present paper reports the synthesis of iron-oxide nanoparticles (diameter 12.8±2.2 nm) coated with silica shell doped with paramagnetic Gd(III)-based complexes. The resulting nanoparticles with a silica shell thickness of about 45 nm have an average diameter of 113.1±14.3 nm and feature high transverse and longitudinal relaxivities (356 and 25 mM−1 s−1, respectively) at 1.5 T and 25 °C on a medical whole body NMR scanner. It has been also revealed using magnetic heating measurements that the prepared core-shell nanoparticles possess a high specific adsorption rate of around 236 W/g in aqueous media. The surface of the composite nanoparticles was decorated by amino-groups for a greater cellular uptake behaviour. The cell viability measurements reveal the concentration-dependent cytotoxicity of the nanoparticles, which agrees well with the high content of Gd(III) complexes in the nanomaterial. The obtained results show that the core-shell design of nanoparticles with superparamagnetic and paramagnetic parts can be promising for high transverse (and longitudinal) relaxivity as well as magnetic hyperthermia.

Graphical abstract

Multifunctional nanoparticles for dual-mode MRI contrast and hyperthermia.

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The work was funded by the Government assignment for FRC Kazan Scientific Center of Russian academy of Science (Reg. Nr. AAAA-A18-118041760011-2). M.R. thanks National Science Foundation of China (Grant No. 52071225) and the Czech Republic under the ERDF program “Institute of Environmental Technology—Excellent Research” (No. CZ.02.1.01/0.0/0.0/16_019/0000853).

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Correspondence to ALEXEY STEPANOV.

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STEPANOV, A., FEDORENKO, S., MENDES, R. et al. T2- and T1 relaxivities and magnetic hyperthermia of iron-oxide nanoparticles combined with paramagnetic Gd complexes. J Chem Sci 133, 43 (2021). https://doi.org/10.1007/s12039-021-01904-7

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  • Gd complexes
  • Iron-oxide nanoparticles
  • Magnetic resonance imaging
  • Hyperthermia