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- W3127954083 abstract "Abstract A novel bifunctional oligonucleotide (OND) probe with single fluorescent group HEX labelled at 5′-end was designed for detecting trace Ag(I) and Pb(II) in real samples. In the presence of Ag(I), the hairpin structure originating from Ag(I) induced cytosine-Ag(I)-cytosine mismatches causes the proximity of the HEX to the consecutive guanine bases (G)4 at 3′-terminal, resulting in the fluorescence quenching of the HEX. While in the presence of Pb(II), the G-quadruplex structure originating from two G-quartet planes by the intramolecular hydrogen bond with Pb(II) also causes the HEX approaching the (G)4 terminal and consequently the fluorescence quenching. The results showed the quantitative detection of trace Ag(I) and Pb(II) both in the linear response ranges of 1.0–20.0 × 10−9 mol L−1 with no visible interferences of other 11 metal ions observed. And the detection limits were 82 × 10−12 mol L−1 for Ag(I), 92 × 10−12 mol L−1 for Pb(II), respectively. The fluorescence quenching mechanism of the (G)4 to HEX was verified to be the photoinduced electron transfer in the aspect of thermodynamics. This method provided a feasible application for sensitive and selective detection of Pb(II) and Ag(I) in water and Chinese traditional herbs with convenient operation." @default.
- W3127954083 created "2021-02-15" @default.
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- W3127954083 date "2021-03-01" @default.
- W3127954083 modified "2023-09-24" @default.
- W3127954083 title "Bifunctional single-labelled oligonucleotide probe for detection of trace Ag(I) and Pb(II) based on cytosine-Ag(I)-cytosine mismatches and G-quadruplex" @default.
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- W3127954083 doi "https://doi.org/10.1016/j.aca.2021.338258" @default.
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