Abstract
A novel fluorescent sensing platform based on nitrogen-doped graphene quantum dots (N-GQDs) is presented, which is able to detect various metabolites (cholesterol, glucose, lactate, and xanthine) rapidly, sensitively, and selectively. Hg2+ can attach on the surface of N-GQDs, leading to the quenching of N-GQD fluorescence. In the presence of cysteine (Cys), Hg2+ is released from N-GQDs and associates with Cys. Then, the fluorescence of N-GQDs is recovered. Hydrogen peroxide, resulting from the enzymatic oxidation of metabolites, can convert two molecules of Cys into one molecule of cystine, which cannot bind with Hg2+. So, the fluorescence of N-GQDs quenched again. For cholesterol, glucose, lactate, and xanthine, the limits of detection are 0.035 μmol/L, 0.025 μmol/L, 0.07 μmol/L, and 0.04 μmol/L, respectively, and the linear ranges are 1–12 μmol/L, 0.06–3 μmol/L, 0.2–70 μmol/L, and 0.12–17 μmol/L, respectively. The presented method was applied to quantify metabolites in human blood samples with satisfactory results.
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Funding
This work is supported by the National Natural Science Foundation of China (No. 21775052 and No. 21575048) and the Science and Technology Development Project of Jilin province, China (No. 20180414013GH).
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Liu, X., Su, X. Nitrogen-doped graphene quantum dot–based sensing platform for metabolite detection. Microchim Acta 187, 532 (2020). https://doi.org/10.1007/s00604-020-04484-4
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DOI: https://doi.org/10.1007/s00604-020-04484-4