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Graphene Quantum Dot–MnO2 Nanosheet Based Optical Sensing Platform: A Sensitive Fluorescence “Turn Off–On” Nanosensor for Glutathione Detection and Intracellular Imaging

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School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
§ Key Laboratory of Pesticide and Chemical Biology of the Ministry of Education, P. R. China and College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
*E-mail: [email protected] (D.D.).
*E-mail: [email protected] (X.S.).
*E-mail: [email protected] (Y.L.).
Cite this: ACS Appl. Mater. Interfaces 2016, 8, 34, 21990–21996
Publication Date (Web):August 5, 2016
https://doi.org/10.1021/acsami.6b05465
Copyright © 2016 American Chemical Society

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    Abstract

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    Glutathione (GSH) monitoring has attracted extensive attention because it serves a vital role in human pathologies. Herein, a convenient fluorescence “turn off–on” nanosensor based on graphene quantum dots (GQDs)–manganese dioxide (MnO2) nanosheet has been designed for selective detection of GSH in living cells. The fluorescence intensity of GQDs can be quenched by MnO2 nanosheets via a fluorescence resonance energy transfer. However, GSH can reduce MnO2 nanosheets to Mn2+ cations and release GQDs, causing sufficient recovery of fluorescent signal. The MnO2 nanosheets serve as both fluorescence nanoquencher and GSH recognizer in the sensing platform. The sensing platform displayed a sensitive response to GSH in the range of 0.5–10 μmol L–1, with a detection limit of 150 nmol L−1. Furthermore, the chemical response of the GQDs–MnO2 nanoprobe exhibits high selectivity toward GSH over other electrolytes and biomolecules. Most importantly, the promising platform was successfully applied in monitoring the intracellular GSH in living cells, indicating its great potential to be used in disease diagnosis. Meanwhile, this GQDs–MnO2 platform is also generalizable and can be easily expanded to the detection and imaging of other reactive species in living cells.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.6b05465.

    • TEM, XPR, Raman spectrum, and UV–vis of the MnO2 nanosheets; lifetime of GQDs with MnO2 nanosheets; optimization conditions (pH and temperature); MTT assay of MnO2 nanosheets and GQDs; confocal fluorescence microscope images of probe with NMM, BSO, and LPA; comparison between methods (PDF)

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