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On–off–on fluorescence sensing of glutathione in food samples based on a graphitic carbon nitride (g-C3N4)–Cu2+ strategy

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Abstract

A novel fluorescence sensor based on a g-C3N4 nanosheet–Cu2+ system has been developed for rapid, sensitive and selective sensing of glutathione (GSH) in food samples. The g-C3N4 nanosheets were used here as a new type of carbon-based nanomaterial with high fluorescence quantum yield and specific surface area. The fluorescence of the g-C3N4 nanosheets was quenched by Cu2+ via a photoinduced electron transfer (PET) process. In the presence of GSH, the fluorescence sensor was switched on, which was attributed to coordination of Cu2+ to GSH and the functional groups on the surface of the g-C3N4 nanosheets. Under optimal conditions, a limit of detection (LOD) of 20 nM for GSH was reached over a wide GSH concentration range of 0.05 to 900 μM. Moreover, the proposed sensor shows excellent performance, and has advantages such as low cost, easy preparation, rapid detection and switch-on fluorescence response. The fluorescence sensor was successfully applied for GSH detection in different food samples.

Graphical abstract: On–off–on fluorescence sensing of glutathione in food samples based on a graphitic carbon nitride (g-C3N4)–Cu2+ strategy

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Publication details

The article was received on 09 Jan 2017, accepted on 18 Mar 2017 and first published on 21 Mar 2017


Article type: Paper
DOI: 10.1039/C7NJ00098G
Citation: New J. Chem., 2017, Advance Article
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    On–off–on fluorescence sensing of glutathione in food samples based on a graphitic carbon nitride (g-C3N4)–Cu2+ strategy

    C. Yang, X. Wang, H. Liu, S. Ge, J. Yu and M. Yan, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00098G

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