期刊
TALANTA
卷 172, 期 -, 页码 95-101出版社
ELSEVIER
DOI: 10.1016/j.talanta.2017.05.031
关键词
Mn2+-doped NaYF4:Yb,Tm UCNPs; UCNPs/Fe3+ system; Redox reaction; Determination
资金
- Natural Science Foundation of China [21475001, 21675002]
- Education Commission Natural Science Foundation of Anhui Province [KJ2017ZD25]
- Foundation for the Innovation Team of Bioanalytical Chemistry
- Special and Excellent Research Fund of Anhui Normal University
An upconversion luminescence method was developed for the determination of glutathione (GSH), L-cysteine (Cys) or L-ascorbic acid (AA) based on redox reaction. We synthesized poly(acrylic acid) (PAA)-modified Mn2+-doped NaYF4:Yb,Tm upconversion nanoparticles (UCNPs), and the luminescence of these UCNPs was effectively quenched due to their carboxyl groups coordinating with Fe3+ to form a UCNPs/Fe3+ system. GSH, Cys or AA reduced Fe3+ to Fe2+, which induced the luminescence recovery of the UCNPs. Under the optimized conditions, wide linear concentration ranges from 0.25-300 mu M for GSH, 0.5-875 mu M for Cys and 0.5-350 mu M for AA were found, and the detection limits (3 S/K) were 0.2 mu M, 0.5 mu M and 0.2 mu M, respectively. Thus, the UCNPs/Fe3+ system was successfully applied for sensing GSH, Cys or AA.
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