Issue 6, 2021

2D CoOOH nanosheets as oxidase mimic for the colorimetric assay of sulfite in food

Abstract

Here, we report a rapid, sensitive and selective colorimetric assay for sulfite (SO32−) based on the intrinsic oxidase-like activity of 2D cobalt oxyhydroxide nanosheets (CoOOH NSs). The 2D CoOOH nanozyme could directly oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) into blue products (TMBox) in an aerobic solution without H2O2. Interestingly, the presence of SO32− could effectively inhibit the CoOOH NS–O2–TMB reaction system and thus caused changes in color and absorbance, which facilitated a colorimetric sensor for sulfite. After optimizing detection conditions, a facile and robust approach was developed for SO32− detection in food.

Graphical abstract: 2D CoOOH nanosheets as oxidase mimic for the colorimetric assay of sulfite in food

Supplementary files

Article information

Article type
Communication
Submitted
08 Jan 2021
Accepted
27 Jan 2021
First published
28 Jan 2021

Anal. Methods, 2021,13, 764-768

2D CoOOH nanosheets as oxidase mimic for the colorimetric assay of sulfite in food

T. Mei, S. Zhang, J. Sun and Y. Hu, Anal. Methods, 2021, 13, 764 DOI: 10.1039/D1AY00039J

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