期刊
TALANTA
卷 240, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2022.123205
关键词
Lanthanide-sensitized luminescence; Europium; Luminescent probe; Propineb; Quenching
The study proposed a modified LSL method with enhanced sensitivity and selectivity through the use of CQDs in the system, successfully applied in PPN residue detection, demonstrating the potential of using nanoparticles in LSL systems for novel and simple analytical methods in the agri-food sector.
We propose a modification of lanthanide-sensitized luminescence (LSL) to increase the selectivity and sensitivity of analytical methods based on this detection. LSL consists in the formation of complexes of lanthanide ions and organic compounds. Then, an intramolecular energy transfer occurs from the excited state of the ligand (organic analyte) to the emitting level of the lanthanide. The utilization of luminescent nanoparticles (carbon quantum dots, CQDs) in LSL systems can enhance their sensitivity and selectivity. CQDs can react with lanthanide ions through their carboxylic groups. These systems can thus be used as time-resolved luminescent probes. Propineb (PPN), a well-known dithiocarbamate fungicide, has been selected as the target analyte to show the advantages of using CQDs in LSL systems. The method proposed is based on the quenching produced by PPN in europiumCQDs luminescence, obtaining a detection limit of 0.03 mu g mL(-1) PPN and a method detection limit of 3 mg kg(-1) in capers (bud and fruit), fulfilling the maximum residue limit in these samples (25 mg kg(-1)). The results showed that the use of nanoparticles in LSL systems may provide novel and simple analytical methods for the screening of contaminants in the agri-food sector.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据