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  • Title: A near-infrared luminescent Mn2+-doped NaYF4:Yb,Tm/Fe3+ upconversion nanoparticles redox reaction system for the detection of GSH/Cys/AA.
    Author: Zhang L, Ling B, Wang L, Chen H.
    Journal: Talanta; 2017 Sep 01; 172():95-101. PubMed ID: 28602309.
    Abstract:
    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 0.25-300μM for GSH, 0.5-875μM for Cys and 0.5-350μM for AA were found, and the detection limits (3S/K) were 0.2μM, 0.5μM and 0.2μM, respectively. Thus, the UCNPs/Fe3+ system was successfully applied for sensing GSH, Cys or AA.
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