Antibacterial Properties of Ferrimagnetic and Superparamagnetic Nanoparticles: a Comparative Study

In this study, antibacterial impact of magnetic nanocomposite (MNC: MoS 2 /CoFe 2 O 4 ) and super paramagnetic iron oxide nanoparticle (SPION: Fe 3 O 4 -Casein) against staphylococcus aureus was studied. It was expected that such comparative study, address key points in optimization of synthesis and design of nanomaterials, which are supposed to be used as antibacterial agents for magnetic fluid hyperthermia (MFH) purposes. As the results, the MNC and SPION had average sizes of 17±4 nm and 15±5 nm, and diffused homogenously in agarose gel. They both were bacteriostatic against S. aureus at very low concentrations, while were bactericidal at concentrations of 200 µg/mL and more in MFH condition. In conclusion, both MNC and SPION inhibit S. aureus viability when low amplitude ( H = 31.16 mT) alternative magnetic field (AMF: f = 150 kHz) was applied. Therefore, both of the nanomaterials are eligible to be considered as antibacterial candidates for treatment of complicated infections in upper respiratory tract or skin.