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Construction of a luminescent sensor based on a lanthanide complex for the highly efficient detection of methyl parathion

机译：基于镧系元素络合物的发光传感器的构建，用于高效检测甲基对硫磷

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A highly sensitive and selective luminescent sensor for the detection of methyl parathion ( MP ) pesticide was described in this study. The target molecule HL was synthesized by modifying the structure of 4-hydroxybenzlidene imidazolinone (HBI) with nitrogen-containing heterocyclic 1,10-phenanthroline. In the presence of Eu ~(3+) , a HL–Eu ~(3+) complex was formed which could emit strong red fluorescence due to the removal of coordinated water molecules and an intramolecular energy transfer from HL to Eu ~(3+) . Addition of MP into the strongly fluorescent solution of HL–Eu ~(3+) induced quenching of the complex's fluorescence, and this quenching behavior occurred because of the competition coordination of MP and HL for Eu ~(3+) . A calibration curve was developed that related the extent of fluorescence quenching to MP concentration, making the HL–Eu ~(3+) system a sensitive and selective fluorescent sensor for MP . Under the experimental conditions, the detection limit for MP was down to 95 nM based on LOD = 3 σ / S . Moreover, the fluorescence assay developed here allowed the detection of MP in two different types of real samples including pond water and pear juice, and satisfactory results demonstrate that this fluorescent sensor based on HL–Eu ~(3+) has potential application in environment and food analysis.
机译：在这项研究中描述了一种用于检测甲基对硫磷（MP）农药的高灵敏度和选择性发光传感器。通过用含氮杂环1,10-菲咯啉修饰4-羟基苄苯并咪唑啉酮（HBI）的结构来合成目标分子HL。在Eu〜（3+）的存在下，形成了HL–Eu〜（3+）配合物，由于去除了配位水分子以及分子内能量从HL转移到Eu〜（3+），可以发出强烈的红色荧光。 ）。在HL–Eu〜（3+）的强荧光溶液中添加MP会诱导复合物的荧光猝灭，并且由于MP和HL对Eu〜（3+）的竞争配位而发生这种猝灭行为。绘制了一条校准曲线，该曲线将荧光猝灭的程度与MP浓度相关联，从而使HL–Eu〜（3+）系统成为MP的灵敏选择性荧光传感器。在实验条件下，基于LOD = 3σ/ S，MP的检出限降至95 nM。此外，这里开发的荧光测定法可以检测两种不同类型的实际样品中的MP，包括池塘水和梨汁，令人满意的结果表明，这种基于HL–Eu〜（3+）的荧光传感器在环境和环境中具有潜在的应用前景。食物分析。

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