期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 153, 期 -, 页码 412-420出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.03.026
关键词
Hemicellulose; Carbon quantum dots; DES; Silver ion; L-Cysteine
资金
- National Key Research and Development Program of China [2016YFD0600803]
- Natural Science Foundation of China [31470606]
The hypersensitive detection of metal ions and amino acid becomes more important for environmental and human physical conditions monitor but remains still a great challenge. In this work, we have reported a green and straight forward procedure (solvothermal treatment) for the synthesis of N-doped hemicellulose-based carbon quantum dots (N-H-CQDs) used as an off-on fluorescence sensor for ultrasensitive detecting Ag+ ion and L-Cysteine (L-Cys). During this process, hemicellulose used as carbon source and nitrogen-rich deep eutectic solvent (DES) of choline chloride/urea acted as both solvent and doping agent. The prepared N-H-CQDs displayed narrow diameter ranging from 2 to 8 nm with relatively higher quantum yield (QY) of 23.45%. This probe was able to selectively detect Ag+ ion on account of the formation of N-H-CQDs-Ag(+)complex and possessed extremely low detection limit of 21 nM. Additionally, the fluorescence of N-H-CQDs-Ag+ complex was restored by the addition of L-Cysteine as Ag - ion would assemble a more stable Ag+-L-Cysteine complex through Ag+-thiol bonds. Accordingly, the N-H-CQDs-Ag+ solution behaved as secondary fluorescent probe to detect L-Cys in the dynamic range of 0-100 mu M with a LOD of 242 nM. The prepared N-H-CQDs are promising probes for hypersensitive detection of Ag+ and L-Cys. (C) 2020 Elsevier B.V. All tights reserved.
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