Bifunctional nanozyme of copper organophyllosilicate for the ultrasensitive detection of hydroquinone
- 21 October 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Analytical and Bioanalytical Chemistry
- Vol. 414 (2), 1039-1048
- https://doi.org/10.1007/s00216-021-03728-3
Abstract
The rapid development of nanozymes for ultrasensitive detection of contaminate has resulted in considerable attention. Herein, a carboxyl- and aminopropyl-functionalized copper organophyllosilicate (Cu-CAP) was synthesized by a facile, one-pot sol–gel method. The bifunctional groups endow it with superior catalytic activity than that of natural enzyme. Besides, it possesses outstanding catalytic stability under harsh conditions such as high temperature, extremely high or low pH, and high salinity. Apart from laccase-mimetic activity, Cu-CAP also shows oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) to the blue-colored TMBox in the presence of H2O2, which is similar to natural horseradish peroxidase (HRP). Interestingly, this colorimetric system was suppressed by hydroquinone (HQ) specifically. Inspired by this, Cu-CAP was used to develop a highly sensitive and selective colorimetric method for the determination of HQ. This assay displayed an extremely low detection limit of 23 nM and was applied for the detection of HQ in environmental water with high accuracy. This approach offers a new route for the rational design of high performance nanozymes for environmental and biosensing applications. Graphical abstractKeywords
Funding Information
- Sichuan Science and Technology Program (2019JDJQ0056)
- Postgraduate Innovation Fund Project by Southwest University of Science and Technology (20YCX0022)
- Russian Science Foundation (21-47-00019)
- National Natural Science Foundation of China (41877323, 42011530085, 42061134018)
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