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Article

A Turn-On Fluorescence Sensor Based on Nitrogen-Doped Carbon Dots and Cu2+ for Sensitively and Selectively Sensing Glyphosate

by
Ziqiang Li
1,2,3,
Shuang Liang
3,
Li Zhou
1,2,
Fengjian Luo
1,2,
Zhengyun Lou
1,2,
Zongmao Chen
1,2,
Xinzhong Zhang
1,* and
Mei Yang
1,2,*
1
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
2
Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China
3
College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
*
Authors to whom correspondence should be addressed.
Foods 2023, 12(13), 2487; https://doi.org/10.3390/foods12132487
Submission received: 14 May 2023 / Revised: 9 June 2023 / Accepted: 19 June 2023 / Published: 26 June 2023
(This article belongs to the Section Food Analytical Methods)
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Abstract

Glyphosate has excellent herbicidal activity, and its extensive use may induce residue in the environment and enter into humans living through the food chain, causing negative impact. Here, water-soluble 1.55 nm size nitrogen-doped carbon quantum dots (NCDs) with strong blue fluorescence were synthesized using sodium citrate and adenine. The maximum excitation and emission wavelengths of NCDs were 380 nm and 440 nm, respectively. The above synthesized NCDs were first used for the construction of a fluorescence sensor for glyphosate detection. It was found that Cu2+ could quench the fluorescence of NCDs effectively through the photoinduced electron transfer (PET) process, which was confirmed using fluorescence lifetime measurements. Additionally, the fluorescence was restored with the addition of glyphosate. Hence, a sensitive turn-on fluorescence sensor based on NCDs/Cu2+ for glyphosate analysis was developed. The LODs of glyphosate for water and rice samples were recorded as 0.021 μg/mL and 0.049 μg/mL, respectively. The sensor was applied successfully for ultrasensitive and selective detection of glyphosate in environmental water and rice samples with satisfied recoveries from 82.1% to 113.0% using a simple sample pretreatment technique. The proposed strategy can provide a significant potential for monitoring glyphosate residue in water and agricultural product samples.
Keywords: carbon quantum dots; fluorescence; glyphosate detection; water; rice carbon quantum dots; fluorescence; glyphosate detection; water; rice

Share and Cite

MDPI and ACS Style

Li, Z.; Liang, S.; Zhou, L.; Luo, F.; Lou, Z.; Chen, Z.; Zhang, X.; Yang, M. A Turn-On Fluorescence Sensor Based on Nitrogen-Doped Carbon Dots and Cu2+ for Sensitively and Selectively Sensing Glyphosate. Foods 2023, 12, 2487. https://doi.org/10.3390/foods12132487

AMA Style

Li Z, Liang S, Zhou L, Luo F, Lou Z, Chen Z, Zhang X, Yang M. A Turn-On Fluorescence Sensor Based on Nitrogen-Doped Carbon Dots and Cu2+ for Sensitively and Selectively Sensing Glyphosate. Foods. 2023; 12(13):2487. https://doi.org/10.3390/foods12132487

Chicago/Turabian Style

Li, Ziqiang, Shuang Liang, Li Zhou, Fengjian Luo, Zhengyun Lou, Zongmao Chen, Xinzhong Zhang, and Mei Yang. 2023. "A Turn-On Fluorescence Sensor Based on Nitrogen-Doped Carbon Dots and Cu2+ for Sensitively and Selectively Sensing Glyphosate" Foods 12, no. 13: 2487. https://doi.org/10.3390/foods12132487

APA Style

Li, Z., Liang, S., Zhou, L., Luo, F., Lou, Z., Chen, Z., Zhang, X., & Yang, M. (2023). A Turn-On Fluorescence Sensor Based on Nitrogen-Doped Carbon Dots and Cu2+ for Sensitively and Selectively Sensing Glyphosate. Foods, 12(13), 2487. https://doi.org/10.3390/foods12132487

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