Abstract
Nitrogen, sulfur, phosphorus, and chlorine co-doped carbon nanodots (NSPCl-CNDs) were fabricated by acid-base neutralization and exothermic carbonization of glucose. The obtained NSPCl-CNDs possess excellent fluorescence properties and good biocompatibility. Curcumin (Cur) can dramatically quench the fluorescence of NSPCl-CNDs based on a synergistic effect of electrostatic interaction, inner filter effect, and static quenching, so a “turn-off” fluorescent probe for Cur detection was constructed with linear ranges of 0.24–13.16 μM and 13.62–57.79 μM. The LOD and LOQ of this fluorescent probe for Cur are 8.71 nM and 29.03 nM, respectively. More importantly, the fluorescence of the NSPCl-CNDs-Cur system can be recovered by europium ion (Eu3+), so a “turn-on” fluorescent probe for Eu3+ determination was established. The linear range, LOD, and LOQ for the detection of Eu3+ were 2.36–32.91 μΜ, 73.29 nM, and 244.30 nM, respectively. The proposed fluorescence methods were successfully utilized for Cur and Eu3+ determination in real samples with recoveries in the range 95.64–104.13% and 97.06–98.70%, respectively. Furthermore, the qualitative analysis of Cur can be realized by reagent strips with satisfying results. Finally, the as-constructed “off-on” fluorescent probe was successfully used to sequentially analyze Cur and Eu3+ at the cellular level. This method is simple and easy to implement, manifesting that NSPCl-CNDs have potential application value in fluorescent probing, food and drug testing, environmental monitoring, and cellular labeling.
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Funding
This work was supported by the National Natural Science Foundation of China (NO. 21705101), Shanxi Provincial Key Research and Development Project (201903D121109), China Postdoctoral Science Foundation (No. 2018 M642969), and Natural Science Foundation of Shanxi Province (No. 201801D121040).
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Hao, Y., Wang, H., Wang, Z. et al. Nitrogen, sulfur, phosphorus, and chlorine co-doped carbon nanodots as an “off-on” fluorescent probe for sequential detection of curcumin and europium ion and luxuriant applications. Microchim Acta 188, 16 (2021). https://doi.org/10.1007/s00604-020-04618-8
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DOI: https://doi.org/10.1007/s00604-020-04618-8