Abstract
A novel chemiluminescence (CL) system based on the reaction of fluorescent water-soluble nitrogen-rich quantum dots (N-dots) and diperiodatoargentate(III) (DPA) was developed. The prepared N-dots have a small size (≤10 nm) and high percentage of nitrogen (39.9 %), which exceeds the content of carbon in the same N-dots. The N-dots exhibit characteristic blue fluorescence under UV light and up-conversion luminescence. The relatively intense CL emission is based on the direct oxidation of N-dots by DPA. The CL emission may be attributed to the high nitrogen content and the special structure of the N-dots. The CL mechanism of N-dots and DPA was investigated by using CL, UV–Vis absorption, IR, fluorescence, and radical scavenging experiments. This investigation provides a way to study the optical properties of N-dots. The analytical applicability of the N-dots and DPA CL system in the determination of ferulic acid (FA) was explored. The CL intensity was linearly proportional to the concentration of ferulic acid from 3.0 × 10−7 to 1.0 × 10−5 g mL−1 with a detection limit of 8.0 × 10−8 g mL−1 (3σ); the relative standard deviation was 2.4 % for 4.0 × 10−7 g mL−1 FA (n = 9). The proposed method was successfully applied to the determination of ferulic acid in Angelica sinensis. The study provides valuable insight into the role of nitrogen-rich quantum dots in CL.
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Acknowledgments
The work were supported by the National Natural Science Foundation of China (nos. 21475153 and 21575167), the Guangdong Provincial Natural Science Foundation of China (No. 2015A030311020), and the Special funds for public welfare research and capacity building in Guangdong Province of China (no. 2015A030401036), respectively.
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Published in the topical collection Highlights of Analytical Chemical Luminescence with guest editors Aldo Roda, Hua Cui, and Chao Lu.
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Fu, Z., Li, G. & Hu, Y. Chemiluminescence of nitrogen-rich quantum dots in diperiodatoargentate(III) solution and its application in ferulic acid analysis. Anal Bioanal Chem 408, 8813–8820 (2016). https://doi.org/10.1007/s00216-016-9786-3
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DOI: https://doi.org/10.1007/s00216-016-9786-3