Abstract
To achieve a rapid, sensitive, and economical method for the detection of ascorbic acid (AA) in the presence of Fe3+, a nitrogen and sulfur co-doped carbon dots (N,S-co-CDs) based fluorescence sensing system was developed. In this work, N,S-co-CDs were successfully synthesized via a one-step microwave-assisted method within 2.5 min using ammonium citrate and L-cysteine as precursors. The fluorescence of N,S-co-CDs was quenched (off ) by Fe3+ through a static-quenching mechanism. Subsequently, the fluorescence was recovered (on) after introducing AA into the quenched system, which was attributed to the reduction effect of AA for Fe3+. Therefore, a switch-on sensor (N,S-co-CDs/Fe3+ system) was developed for AA detection. Under optimal conditions, the limit of detection (LOD) of 2.31 μamol/L for AA was obtained over a linear range from 0 to 150 μamol/L. Furthermore, the proposed sensing method was successfully applied to detect AA in processed fruit juice with satisfactory results. The most important is that the sensor derived from a microwave-assisted method has simple and eco-friendly synthesis processes, is rapid, and has high detection efficiency. Therefore, such a switch-on sensor may be a promising candidate sensor for AA detection in processed fruit samples.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (31660482, 31701705 and 21667018), Outstanding Youth Foundation of Jiangxi (20171BCB23010), and the Open Project Program of State Key Laboratory of Food Science and Technology, Nanchang University (SKLF-KF-201813).
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Xu, S., Ye, S., Xu, Y. et al. Microwave-assisted Synthesis of N,S-co-carbon Dots as Switch-on Fluorescent Sensor for Rapid and Sensitive Detection of Ascorbic Acid in Processed Fruit Juice. ANAL. SCI. 36, 353–360 (2020). https://doi.org/10.2116/analsci.19P350
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DOI: https://doi.org/10.2116/analsci.19P350