Copper(II)-coated Fe3O4 nanoparticles as an efficient enzyme mimic for colorimetric detection of hydrogen peroxide
The authors describe the preparation of Cu(II)-coated Fe3O4) nanoparticles (NPs) that possess excellent peroxidase-like activity. The NPs were formed by chelation between Cu(II) ions and the oxygen functional groups of sodium ligninsulfonate. The morphology and structure of the NPs were characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The NPs have an average diameter of 220 nm. They are shown to be viable peroxidase mimics that can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine by hydrogen peroxide to produce a blue coloration. The findings were used to design a colorimetric assay that has a linear response in the 2.5 to 100 μM H2O2 concentration range and a 0.2 μM detection limit. The assay excels by its selectivity, high sensitivity, good selectivity, portability and cost efficiency.
KeywordsFe3O4-Cu2+ nanoparticles Nanozyme Biosensor Hydrogen peroxide Colorimetric method
This study was financed by the Science and Technology Program of Zhejiang Province of China (LGF18H200005), NSFC (21405029, and 61731008), the Medical and Health Technology Development Program of Zhejiang province (2017KY533), and the Young and Middle-aged Academic Leaders of Zhejiang Province.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
- 22.Menon S, Chandran S, Koyappayil A, Berchmans S (2018) Copper-based metal-organic frameworks as peroxidase mimics leading to sensitive H2O2 and glucose detection. Chem Select 3:8319–8324Google Scholar