Fluorescent “on–off–on” sensor based on N, P co-doped carbon nanoparticles for specific detection of Fe3+ and ascorbic acid

Authors

Li Li, Zhenjiang College, Zhenjiang, 212000, PR ChinaFollow
Ming Zhang, Jangsu Vocational College of Agriculture and Forestry, Zhenjiang, 212000, PR China
Xiang Liu, Zhenjiang College, Zhenjiang, 212000, PR China
Shaoqing Zhu, Zhenjiang College, Zhenjiang, 212000, PR China

Keywords

Ascorbic acid, Co-doped carbon nanoparticles, Fe3þ, On-off-on fluorescent nano-sensor, Sucrose

Abstract

Ascorbic acid (AA) is used as a food additive for its antibacterial and antioxidant properties. However, excessive intake of AA is harmful to humans. Therefore, the detection of Fe³⁺ and AA is generally recognized to be meaningful. In this work, a one-step hydrothermal tactics is developed for the preparing nitrogen and phosphorus co-doped carbon nanoparticles (N, P-CNPs) by using sucrose and ammonium orthophosphate as raw materials. The N, P-CNPs not only exhibited an enhanced fluorescent efficiency with a relatively high quantum yield up to 28%, but also showed satisfactory stability, water solubility and photostability. The fluorescence of N, P-CNPs can be effectively quenched by Fe³⁺ by a combination of inner filter effect (IFE) and static quenching and recovered upon the addition of AA due to the easy conversion of Fe³⁺ to reduced states Fe²⁺ by AA. Therefore, a turn-off-on fluorescent sensing strategy can be constructed for sequential detection of Fe³⁺ and AA with detection limits of 0.03 μM and 6 nM with the corresponding linear ranges of 0.05–500 µM and 0.01–500 μM respectively. The proposed fluorescent sensor exhibits excellent sensing performance and has been applied to the determination of Fe³⁺ in tap water and the analyses of AA in canned fruit soup with satisfactory results. Therefore, this fluorescent sensor expressed high potential in water quality monitoring, and could be further used to be a tool for practical food additives detection.

Abstract Image

Recommended Citation

Li, Li; Zhang, Ming; Liu, Xiang; and Zhu, Shaoqing (2024) "Fluorescent “on–off–on” sensor based on N, P co-doped carbon nanoparticles for specific detection of Fe3+ and ascorbic acid," Journal of Food and Drug Analysis: Vol. 32 : Iss. 4 , Article 12.
Available at: https://doi.org/10.38212/2224-6614.3533

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