Issue 76, 2017, Issue in Progress

A new two-mode fluorescence signal amplification strategy for protease activity assay based on graphene oxide

Abstract

A graphene oxide (GO)-based two-mode fluorescence signal amplification assay of protease activity has been established. GO can adsorb the FITC-labeled substrate peptide and quench the fluorescence of FITC. In the presence of the target protein, carboxypeptidase Y (CPY), the FITC-labeled substrate peptide is hydrolyzed by CPY, leading to the turn-on of fluorescence. The fluorescence intensity increases significantly after the hydrolysis. More interestingly, it is even much higher than the fluorescence intensity of the added FITC-labeled substrate peptides. It is deduced that the extraordinary growing of fluorescence intensity is attributed to the hydrolysis also. The strong quenching efficiency of GO significantly improved the signal-to-noise ratio (SNR) of the proposed method for protease analysis. By combining the GO-based fluorescence turn-on with the fluorescence signal amplification induced by hydrolysis, the proposed method obtained higher sensitivity and specificity for CPY activity detection. The detection limit for CPY activity assay is estimated to be 1.0 × 10−5 U μL−1. The other proteins, proteases and a complicated matrix cannot disturb the assay of CPY activity.

Graphical abstract: A new two-mode fluorescence signal amplification strategy for protease activity assay based on graphene oxide

Article information

Article type
Paper
Submitted
24 Jul 2017
Accepted
30 Sep 2017
First published
12 Oct 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 47983-47989

A new two-mode fluorescence signal amplification strategy for protease activity assay based on graphene oxide

F. Wang, J. Gao, J. Zhao, W. Zhang, J. Bai, H. Jia and Y. Wang, RSC Adv., 2017, 7, 47983 DOI: 10.1039/C7RA08166A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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