Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 63, Issue 6, Pages 1747-1755Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf505759z
Keywords
glutathione; g-CNQDs; switch-on fiuorescence; food sample
Funding
- National Nature Science Foundation of China [21475053]
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Fluorescence sensing of specific biological molecules by artificial chemosensors is a versatile technique. In the present work, a switch-on fluorescence sensor for rapid, sensitive, and selective sensing of glutathione (GSH) in food samples was developed. This method was based on the g-CNQDsHg(2+) system, in which the initial fluorescence from g-CNQDs was quenched by Hg2+ with an electron transfer process. In the presence of GSH, the fluorescence sensor was switched to the on state, which was attributed to a competitive affinity of Hg2+ to GSH and the functional groups on the surface of g-CNQDs. Under the optimal conditions, the limit of detection (LOD) of 37 nM for GSH was achieved with a wide range of 0.1616 mu M. The repeatability was better than 5.3% for GSH in both standard and food samples (n = 3). Finally, this fluorescence sensor was successfully employed for the determination of GSH in various kinds of food samples with excellent recoveries. Furthermore, this application may pave a new way for fluorescence sensing of other substances in food samples.
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