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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
Published on: July 8, 2025
A novel fluorescent silver ion biosensor based on nucleic acid molecular "light switch".
Qi Xiao1, Shan Huang, Yushu Ge
1Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China.
Journal of Fluorescence
|December 18, 2009
Summary
A novel method uses a ruthenium complex and DNA to detect silver ions (Ag+). The complex
Area of Science:
- Analytical Chemistry
- Bioinorganic Chemistry
- Materials Science
Background:
- Ruthenium complexes, such as Ru(bipy)2(dppx)2+, act as fluorescent probes for double-helical DNA.
- The fluorescence of this complex is quenched by the presence of silver ions (Ag+).
Purpose of the Study:
- To develop a simple, rapid, and specific method for determining Ag+ concentration.
- To investigate the interaction between Ag+ and DNA using fluorescence-based techniques.
Main Methods:
- Utilizing the fluorescence quenching of the Ru(bipy)2(dppx)2+-DNA system by Ag+.
- Applying fluorescence microscopy, circular dichroism spectroscopy, and isothermal titration calorimetry to study the Ag+-DNA interaction.
Main Results:
- A linear correlation was established between Ag+ concentration (0.2–6.0 μM) and the quenching of Ru(bipy)2(dppx)2+ fluorescence.
- A detection limit of 3.2 x 10^-8 M for Ag+ was achieved.
- The method was successfully applied to analyze Ag+ in water samples and silver cream.
Conclusions:
- The proposed method offers a sensitive and specific approach for Ag+ determination.
- Fluorescence microscopy confirmed the interaction between Ag+ and DNA, consistent with spectroscopic findings.
- The study provides insights into the mechanism of Ag+ interaction with the DNA-Ru complex system.
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