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Fe(3+)-functionalized carbon quantum dots: A facile preparation strategy and detection for ascorbic acid in rat brain
Linbo Li1, Chao Wang2, Jingxuan Luo2
1College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China; Department of Chemistry, Capital Normal University, Beijing 100048, China.
Talanta
|October 11, 2015
Summary
A new fluorescent probe using iron(III)-functionalized carbon quantum dots (CQDs) enables sensitive detection of ascorbic acid (AA). This method offers a highly selective "on-off-on" fluorescence response for AA analysis in biological samples.
Area of Science:
- Nanomaterials Science
- Analytical Chemistry
- Biochemistry
Background:
- Ascorbic acid (AA) plays crucial roles in biological systems, necessitating accurate detection methods.
- Existing methods for AA detection often face limitations in sensitivity, selectivity, or applicability to biological matrices.
- Carbon quantum dots (CQDs) offer unique optical properties suitable for developing novel biosensors.
Purpose of the Study:
- To develop a highly sensitive and selective fluorescent probe for ascorbic acid (AA) detection.
- To utilize Fe(3+)-functionalized CQDs for a novel
- on-off-on
- fluorescence response mechanism.
- To validate the probe's performance in analyzing AA in complex biological samples like rat brain microdialysates.
Main Methods:
- Synthesis of CQDs via one-step pyrolysis of tris(hydroxymethyl)aminomethane (Tris).
- Functionalization of CQDs with Fe(3+) ions, leading to fluorescence quenching via Fluorescence Resonance Energy Transfer (FRET).
- Exploitation of the redox reaction between Fe(3+) and AA for fluorescence restoration and signal generation.
Main Results:
- Fe(3+)-functionalized CQDs exhibited a sensitive
- on-off-on
- fluorescence response to AA.
- The probe demonstrated high sensitivity for AA detection, with a limit of detection as low as 9.1 nM.
- The developed nanoprobe showed excellent selectivity and was successfully applied to the direct analysis of AA in rat brain microdialysates.
Conclusions:
- Fe(3+)-functionalized CQDs provide an effective platform for sensitive and selective ascorbic acid detection.
- The novel fluorescence-based assay offers advantages over existing methods for AA quantification in biological fluids.
- This approach opens new avenues for designing CQDs-based fluorescent probes for diverse bioanalytical applications.
