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Carbon Quantum Dots from Pomelo Peel as Fluorescence Probes for Turn-Off-On High-Sensitivity Detection of Fe3+ and L-Cysteine
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DOI：10.3390/molecules27134099.png)
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Abstract
En 中文
This study designed a turn-off-on fluorescence analysis method based on carbon quantum dots (CQDs) to detect metal ions and amino acids in real sample systems. CQDs were derived from green pomelo peel via a one-step hydrothermal process. The co-doped CQDs with N and S atoms imparted excellent optical properties (quantum yield = 17.31%). The prepared CQDs could be used as fluorescent turn-off probes to detect Fe3+ with a limit of detection of 0.086 mu M, a linear detection range of 0.1-160 mu M, and recovery of 83.47-106.53% in water samples. The quenched CQD fluorescence could be turned on after adding L-cysteine (L-Cys), which allowed detection of L-Cys with a detection limit of 0.34 mu M and linear range of 0.4-85 mu M. Recovery of L-Cys in amino acid beverage was 87.08-122.74%. Visual paper-based testing strips and cellulose/CQDs composite hydrogels could be also used to detect Fe3+ and L-Cys.
Keywords:
carbon quantum dots
turn-off-on
pomelo peel
fluorescence probe
Fe3+
L-cysteine
Journal
IF:
4.6
Papers:
6.4W
Citations:
23.7W
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