A turn-on fluorescent nanoprobe based on N-doped silicon quantum dots for rapid determination of glyphosate
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ORIGINAL PAPER
A turn-on fluorescent nanoprobe based on N-doped silicon quantum dots for rapid determination of glyphosate Xianfeng Wang 1 & Yixia Yang 1 & Danqun Huo 1 & Zhong Ji 1 & Yi Ma 2 & Mei Yang 1 & Huibo Luo 2 & Xiaogang Luo 1 & Changjun Hou 1 & Jiayi Lv 1 Received: 24 October 2019 / Accepted: 27 April 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract N-Doped silicon quantum dots (N-SiQD) were synthesized using N-[3-(trimethoxysily)propyl]-ethylenediamine and citric acid as silicon source and reduction agent, respectively. The N-SiQD shows a strong blue fluorescence with a high quantum yield of about 53%. It is found that a selective static quenching process occurs between N-SiQDs and Cu2+. Glyphosate can inhibit this phenomenon and trigger the rapid fluorescence enhancement of the quenched N-SiQDs/Cu2+ system due to the specific interaction between Cu2+ and glyphosate. With such a design, a turn-on fluorescent nanoprobe based on N-SiQD/Cu2+ system was established for rapid determination of glyphosate. The determination signal of N-SiQD/Cu2+ was measured at the optimum emission wavelength of 460 nm after excitation at 360 nm. Under optimal conditions, the turn-on nanoprobe showed a linear relationship between fluorescent response and glyphosate concentrations in the range 0.1 to 1 μg mL−1. The limit of determination was calculated to 7.8 ng mL−1 (3σ/S). Satisfactory recoveries were obtained in the determination of spiked water samples, indicating the potential use for environmental monitoring. Keywords N-SiQDs . Copper ions . Fluorescence determination . Organophosphorus pesticide . Static quenching . Diamine groups . DAMO
Introduction Given the advantages of high herbicidal activity and low toxicity, the broad-spectrum glyphosate is extensively used in the Xianfeng Wang and Yixia Yang contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04304-9) contains supplementary material, which is available to authorized users. * Xiaogang Luo [email protected] * Changjun Hou [email protected] 1
Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400044, People’s Republic of China
2
Liquor Making Biology Technology and Application of Key Laboratory of Sichuan Province, College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, People’s Republic of China
global agriculture to inhibit the growth of weed and vegetation [1]. However, the excessive use of glyphosate leads to potential threat to human health and ecosystem through the bioconcentration of glyphosate residue in environment [2]. Studies also demonstrate that glyphosate is a potential endocrine disruptor [3] and exhibits the adverse effects on cell cycle regulation [4]. Regulations have been enacted to control the glyphosate level. In drinking water, a maximum
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