A Novel Fluorescent Biosensor for Detection of Silver Ions Based on Upconversion Nanoparticles |
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Authors: | Qian Long Yanqing Wen Haitao Li Youyu Zhang Shouzhuo Yao |
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Affiliation: | 1.Hunan Vocational Institute of Safety Technology,Changsha,China;2.Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education),College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha,China |
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Abstract: | In this paper, we report a simple and sensitive fluorescent biosensor for the quantitative analysis of silver ions (Ag+) by using NaYF4:Yb3+, Tm3+ upconversion nanoparticles (UCNPs). Ag+ could oxidize o-phenylenediamine (OPD) to the oxidized OPD (oxOPD) directly. The fluorescence of UCNPs can be significantly quenched by oxOPD through inner filter effects (IFE). Under the optimized conditions, the Ag+ concentration is proportional to the changes of the fluorescence intensity of UCNPs. The proposed method shows high selectivity and Ag+ could be quantitatively detected in the range of 0 to 0.5 mM with a low detection limit of 33 nM for Ag+. The selectivity and sensitivity of the detection can also be satisfactory. More importantly, this method has potential in practical application to detect Ag+ in real samples without interference. |
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