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Fluorescence switch for silver ion detection utilizing dimerization of DNA-Ag nanoclusters
Jihyun Lee1, Juhee Park1, Hong Hee Lee2
1Center for Self-Assembly and Complexity, Institute for Basic Science, and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
Biosensors & Bioelectronics
|February 7, 2015
Summary
A novel fluorescence switch using DNA-templated silver nanoclusters (DNA-AgNCs) detects silver ions (Ag+). This method offers sensitive and selective Ag+ detection, even in complex samples like burn ointments.
Area of Science:
- Nanotechnology
- Biochemistry
- Analytical Chemistry
Background:
- Silver ions (Ag+) play crucial roles in biological processes and environmental science.
- Existing methods for Ag+ detection often lack sensitivity, selectivity, or speed.
- DNA-templated silver nanoclusters (DNA-AgNCs) offer unique optical properties for sensing applications.
Purpose of the Study:
- To develop a sensitive and selective fluorescence switch for detecting silver ions (Ag+).
- To elucidate the mechanism behind the Ag+-triggered fluorescence switching in DNA-AgNCs.
- To demonstrate the practical application of the developed sensor for Ag+ quantification in pharmaceutical formulations.
Main Methods:
- Synthesis and characterization of DNA-AgNCs.
- Investigation of fluorescence switching mechanism using fluorescence spectroscopy, circular dichroism spectroscopy, DNA hybridization assay, and mass spectrometry.
- Detection and quantification of Ag+ in Silmazin® (a burn ointment).
Main Results:
- A novel Ag+-triggered fluorescence switch based on DNA-AgNCs was successfully developed.
- Ag+ induces dimerization of Cyt12-AgNCs, causing a red-to-green fluorescence shift.
- The sensor achieved sensitive detection of Ag+ down to 10 nM with high selectivity and rapid response time.
- Successful quantitative detection of Ag+ in Silmazin® demonstrated practical applicability.
Conclusions:
- The developed DNA-AgNCs fluorescence switch provides a highly sensitive, selective, and rapid method for Ag+ detection.
- The mechanism involves Ag+-induced dimerization of DNA-AgNCs, altering their optical properties.
- This innovative sensor has potential applications in environmental monitoring, clinical diagnostics, and pharmaceutical analysis.
