Copper(II)-coated Fe3O4 nanoparticles as an efficient enzyme mimic for colorimetric detection of hydrogen peroxide

Author:

Liu, Hongying  Zhu, Langlang  Ma, Huan  Wen, Jiajun  Xu, Hanxiao  Qiu, Yubing  Zhang, Linan  Li, Lihua  Gu, Chunchuan  

Journal:

MICROCHIMICA ACTA

Issue Date:

2019

Abstract(summary):

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 mu MH2O2 concentration range and a 0.2 mu M detection limit. The assay excels by its selectivity, high sensitivity, good selectivity, portability and cost efficiency.