研究目的
To develop a reliable analytical method for the quantification of glyphosate in food samples using graphene quantum dots and cysteine-capped silver nanoparticles as a luminescence probe.
研究成果
The developed method provides a sensitive, selective, and straightforward approach for the determination of glyphosate in food samples, with excellent recovery rates and low detection limits. It represents a novel application of GQDs-AgNPs as a luminescent probe for pesticide analysis.
研究不足
The method requires the synthesis of GQDs and AgNPs, which may be time-consuming. The specificity towards Gly in the presence of other pesticides was tested, but potential interference from other food matrix components was not extensively studied.
1：Experimental Design and Method Selection:
The method utilizes graphene quantum dots (GQDs) and cysteine-capped silver nanoparticles (AgNPs) for the luminescent detection of glyphosate (Gly). The quenching effect of Gly on the luminescence of GQDs-AgNPs system is measured.
2：Sample Selection and Data Sources:
Food samples (peas and lupins) were purchased from local markets.
3：List of Experimental Equipment and Materials:
Instruments include a Cary Eclipse luminescence spectrometer, a JEOL JEM-1010 transmission electron microscopy (TEM), and an Ultra-Turrax T18 basic for sample preparation. Reagents include Gly, AgNO3, NaBH4, L-cysteine, uric acid, H2SO4, NaOH, and others.
4：Experimental Procedures and Operational Workflow:
Synthesis of AgNPs and GQDs, preparation of sample solutions, measurement of luminescence quenching by Gly, and data analysis.
5：Data Analysis Methods:
The quenching effect is quantified by measuring the decrease in luminescence intensity at 460 nm, with calibration curves constructed for Gly concentration determination.
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