Issue 23, 2017

Enzyme-free fluorescence sensing of catechins in green tea using bifunctional graphene quantum dots

Abstract

The fluorescent graphene quantum dots (GQDs) provide an amusing nanoplatform, which integrates unique optical properties of quantum dots and prominent electronic properties of carbon materials. However, rational design of dual functional GQDs has been rarely explored. In this study, we constructed an enzyme-free fluorescent sensing method for catechins in green tea, using bifunctional GQDs, which were employed as the peroxidase-like catalyst and a fluorescence probe. In the presence of dissolved oxygen, GQDs with intrinsic peroxidase-like catalytic activity could catalyze the oxidation of catechins, and the oxidation product could efficiently quench GQDs' fluorescence. Based on this finding, an enzyme-free fluorescent nanoplatform was proposed for the sensing of catechins, and the detection limit of 5.0 nM was found. The integration between the excellent fluorescence performance of GQDs and their high catalytic activity made this sensor a simple and sensitive device for the detection of catechins.

Graphical abstract: Enzyme-free fluorescence sensing of catechins in green tea using bifunctional graphene quantum dots

Article information

Article type
Paper
Submitted
13 Apr 2017
Accepted
17 May 2017
First published
17 May 2017

Anal. Methods, 2017,9, 3525-3530

Enzyme-free fluorescence sensing of catechins in green tea using bifunctional graphene quantum dots

J. Sun, Y. He and L. Wang, Anal. Methods, 2017, 9, 3525 DOI: 10.1039/C7AY00973A

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