Related Experiment Video
Updated: Jun 22, 2025
07:13
Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
Published on: June 28, 2024
1.2K
Ultrasensitive Fluorescence Detection of Ascorbic Acid Using Silver Ion-Modulated High-Quality CdSe/CdS/ZnS Quantum
Xingchang Lu1, Zheng Wang2,3, Jianxiu Wang1
1Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China.
ACS Omega
|July 1, 2024
Summary
This study presents a highly sensitive fluorescence method for detecting ascorbic acid (AA) using quantum dots. The novel sensing strategy achieves a low detection limit of 0.2 nM, showing promise for clinical analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Materials Science
Background:
- Improving fluorescence detection sensitivity is critical for analyzing bioactive molecules.
- Ascorbic acid (AA) is a vital bioactive molecule requiring accurate quantification.
- Existing methods may lack the required sensitivity and selectivity for certain applications.
Purpose of the Study:
- To develop an ultrasensitive fluorescence sensing strategy for ascorbic acid (AA) detection.
- To utilize novel quantum dots (QDs) as fluorescent probes for enhanced sensitivity.
- To validate the sensing system's performance and applicability in real-world samples.
Main Methods:
- Synthesis of water-soluble 3-mercaptopropionic acid-capped CdSe/CdS/ZnS quantum dots (MPA-CdSe/CdS/ZnS QDs) with high photoluminescence quantum yield (PL QY).
- Development of a fluorescence quenching and recovery mechanism involving Ag+ ions and AA.
- Utilizing photoinduced electron transfer (PET) for signal transduction.
- Testing the system's selectivity against common interfering substances.
Main Results:
- The MPA-CdSe/CdS/ZnS QDs demonstrated a high PL QY of up to 96%.
- A dynamic quenching mechanism by Ag+ ions was established, leading to fluorescence quenching.
- The presence of AA caused the reduction of Ag+ ions, restoring QD fluorescence and enabling sensitive detection.
- An ultrasensitive detection limit for AA as low as 0.2 nM was achieved.
- The sensing system exhibited high selectivity, with minimal interference from other small molecules and ions.
Conclusions:
- The developed MPA-CdSe/CdS/ZnS QD-based fluorescence sensing strategy offers ultrasensitive and selective detection of ascorbic acid.
- The system's ability to function in complex matrices like orange beverages highlights its practical potential for clinical analysis.
- This approach provides a robust platform for the sensitive quantification of bioactive molecules.
