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A new dual-emission fluorescence sensor based on carbon nanodots and gold nanoclusters for the detection of melamine

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Abstract

Herein, a new ratiometric fluorescence probe is developed by the self-assembly of carbon nanodots and glutathione-stabilized gold nanoclusters (CNDs/GSH@Au NCs) to detect melamine. The red fluorescence of GSH@Au NCs can be quenched by Hg2+ and recovered by melamine, while the blue fluorescence of CNDs remains constant, so GSH@Au NCs serve as the signal section and the CNDs serve as the internal reference. This CNDs/GSH@Au NCs–Hg2+ system exhibits high sensitivity for melamine in the linear range from 0.1 to 30 μM with a detection limit of 29.3 nM. Moreover, this system also exhibits good selectivity, and some interfering substances, such as metal ions, amino acids, sugars and nitrogen-containing organic molecules, have no distinct effect on the determination of melamine. Benefiting from the high sensitivity and selectivity, the satisfactory recoveries are obtained in the detection of melamine in food samples, including milk, infant formula, and cat food.

Graphical abstract: A new dual-emission fluorescence sensor based on carbon nanodots and gold nanoclusters for the detection of melamine

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Publication details

The article was received on 17 Jul 2017, accepted on 24 Jul 2017 and first published on 24 Jul 2017


Article type: Paper
DOI: 10.1039/C7NJ02594G
Citation: New J. Chem., 2017, Advance Article
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    A new dual-emission fluorescence sensor based on carbon nanodots and gold nanoclusters for the detection of melamine

    F. Qu, X. Xu and J. You, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ02594G

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