Gold-decorated magnetic nanoparticles design for hyperthermia applications and as a potential platform for their...

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Multifunctional nanosystems integrating noble metals and magnetic nanoparticles are of significant interest in medicine.
• Controlled synthesis of nanocomposites allows for coupling various specific effects.

Purpose of the Study:

• To develop a synthesis route for gold nanoparticles attached to iron oxide nanoparticle cores.
• To evaluate the magnetic properties, biocompatibility, and nano-heating potential of the resulting nanocomposite.

Main Methods:

• Synthesis of small gold nanoparticles (=3.9±0.2 nm) attached to iron oxide nanoparticle cores (=49.2±3.5 nm) in an aqueous medium.
• Characterization of magnetic properties, including bulk magnetic moment and Verwey transition.
• In vitro cytotoxicity analysis on microglial BV2 cells.
• In vitro heating experiments under an AC magnetic field.

Main Results:

• Successfully synthesized Au@PEI-Fe3O4 nanoparticles with retained bulk magnetic moment (Ms=82-84 Am²/kgFe3O4) and observed Verwey transition at Tv=98 K.
• Demonstrated high cell viability (>97.5%) of Au@PEI-Fe3O4 nanoparticles in microglial BV2 cells up to 100 µg/mL.
• Achieved specific power absorption (SPA) values of 43±3 μW/cell for PEI-Fe3O4 and 49±1 μW/cell for Au@PEI-Fe3O4 under AC magnetic field.

Conclusions:

• The functionalization of magnetic nanoparticles with gold did not alter their heating efficiency.
• The Au@PEI-Fe3O4 nanoparticles offer a flexible platform for multifunctional applications in nanomedicine, particularly as nano-heaters.