Journal
BIOSENSORS & BIOELECTRONICS
Volume 26, Issue 11, Pages 4497-4502Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2011.05.009
Keywords
Graphene; Maltose; Concanavalin A; Homogeneous; Fluorescence resonance energy transfer
Categories
Funding
- National Natural Science Foundation of China [90813015]
- National Basic Research Program of China [2007CB714507]
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In this work, we proposed a novel biosensor to homogeneously detect concanavalin A (ConA) using pyrene-conjugated maltose assembled graphene based on fluorescence resonance energy transfer (FRET). Maltose-grafted-aminopyrene (Mal-Apy) was synthesized and characterized by mass spectra, UV-vis and fluorescence spectra. The Mal-Apy was further employed for fluorescence switch and ConA recognition. When Mal-Apy was self-assembled on the surface of graphene by means of pi-stacking interaction, its fluorescence was adequately quenched because the graphene acted as a nanoquencher of the pyrene rings due to FRET. As a result, in the presence of ConA, competitive binding of ConA with glucose destroyed the pi-stacking interaction between the pyrene and graphene, thereby causing the fluorescence recovery. This method was demonstrated the selective sensing of ConA, and the linear range is 2.0 x 10(-2) to 1.0 mu M with the linear equation y = 1.029x + 0.284 (R = 0.996). The limit of detection for ConA was low to 0.8 nM, and the detection of ConA could be performed in 5 min, indicating that this method could be used for fast, sensitive, and selective sensing of ConA. Such data suggests that the graphene FRET platform is a great potential application for protein-carbohydrate studies, and would be widely applied in drug screening, bimolecular recognition and disease diagnosis. (C) 2011 Elsevier B.V. All rights reserved.
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