Superoxide dismutase mimic activity of spinel ferrite MFe$_2$O$_4$ (M $=$ Mn, Co and Cu) nanoparticles

[摘要] In the present study, superoxide dismutase (SOD) mimic activity of ferrite nanoparticles (NPs), having a formula MFe$_2$O$_4$ (M $=$ Mn, Co and Cu) was investigated. Spinel ferrite NPs were synthesized by employing sol–gelmethodology and characterized using scanning electron microscopy, X-ray diffraction, BET analysis and Fourier transform infrared spectroscopy techniques. BET analysis revealed that the surface area of ferrite NPs ranged from 0.43−23.49 m$2^$ g$^{−1}$. Enzyme mimic activity was compared using SOD as a model enzyme. CuFe$_2$O$_4$ NPs exhibited a maximum activity followedby CoFe$_2$O$_4$ and MnFe$_2$O$_4$ NPs. The results were correlated with a facile interconversion of the oxidation state leading to a stable electronic configuration in CuFe$_2$O$_4$ NPs. Optimum pH and contact time was 1 and 3 min respectively. Kinetic studies were performed under optimum conditions and data were analysed using the Michaelis Menten equation. The valuesof $V_{\rm max}$ (0.77 s$^{−1}$) and Km (4.20 mM) proved CuFe$_2$O$_4$NPs as potential SOD mimic for a wide range of applications.

[学科分类] 材料工程

[关键词] Ferrite nanoparticles;enzyme mimics;superoxide dismutase mimic.