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Catalysis in Green Chemistry and Engineering

ISSN Print: 2572-9896
ISSN Online: 2572-990X

Catalysis in Green Chemistry and Engineering

DOI: 10.1615/CatalGreenChemEng.2019029572
pages 357-368

ENZYME MIMIC OXIDASE-LIKE ACTIVITY OF Fe3O4 MAGNETIC NANOPARTICLES FOR DOPAMINE DETECTION

Suraj V. Yadav
Department of Chemical Engineering, Institute of Chemical Technology, Matunga (E), Mumbai, 400019, India
Virendra K. Rathod
Department of Chemical Engineering, Institute of Chemical Technology, Matunga (E), Mumbai, 400019, India

ABSTRACT

Enzyme mimics have garnered substantial attention as they can overcome some severe drawbacks associated with nat- ural enzymes such as inhibition of their catalytic activity. The present study proves that the Fe3O4 magnetic nanoparticles (MNPs) exhibit an oxidase-like activity similar to that found in the tyrosinase enzyme. The Fe3O4 nanoparticles (NPs) were prepared by the solvothermal method and characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscopy with energy dispersive X-ray, X-ray photoelectron spectroscopy (XPS), and dynamic light scattering/zeta potential techniques to know the structural properties of MNPs. XPS analysis shows that the enzyme mimetic activity of NPs is due to Fe2+ and Fe3+ in Fe3O4 nanoparticle systems. Colorless dopamine forms colored dopamine-o-quinone due to surface modification of MNPs as well as both σ- and π-donor bonding contribution to overall stability. Enzyme mimetics Fe3O4 NPs were used as a new technique for colorimetric detection of dopamine.