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A host-guest complexation based fluorescent probe for the detection of paraquat and diquat herbicides in aqueous solutions

机译:基于宿主的络络型荧光探针,用于检测水溶液中的百草枯和肝脏除草剂

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摘要

The supramolecular interactions among thioflavin T (ThT), two herbicides paraquat (PQ) and diquat (DQ), and macrocyclic cucurbit[8]uril (Q[8]), were studied using spectrofluorimetry, ultraviolet-visible absorbance spectrometry, H-1 nuclear magnetic resonance spectroscopy, and isothermal titration calorimetry. A new method based on fluorescence quenching of the fluorescent host-guest complexes of Q[8]-ThT (the probe) upon cooperative binding with PQ or DQ to form a ternary complex, was proposed for the analytical determination of the two herbicides in aqueous solutions. Detection limits of 7.95 x 10(-9) mol L-1 and 8.07 x 10(-9) mol L-1 were obtained for PQ and DQ, respectively. Recoveries obtained by the proposed method in real-world examples such as river water and cabbage extracts were 104-108%. Interestingly, this method demonstrated high selectivity towards PQ and DQ in the presence of various metal ions and quaternary ammonium substances. Such a method provides a rapid, selective, sensitive and facile strategy for herbicides detection and quantification.
机译:使用光谱氟化物,紫外线可见光光谱法,H-1研究了硫蛋白T(THT),两种除草剂(PQ)和Diquat(PQ)和DQ.8]尿嘧啶(Q [8])中的超分子相互作用。核磁共振光谱和等温滴定热量测定法。基于Q [8] -tht(探针)的荧光宿主 - 访客复合物的荧光猝死在与PQ或DQ合作结合后进行荧光宿主 - 访验型以形成三元复合物的荧光猝灭,用于分析两种除草剂在水性中的分析解决方案。为PQ和DQ获得7.95×10(-9)mol L-1和8.07×10(-9)mol L-1的检测限。通过河水和白菜提取物等现实世界示例中所提出的方法获得的回收率为104-108%。有趣的是,在各种金属离子和季铵物质存在下,该方法对PQ和DQ进行了高选择性。这种方法为除草剂检测和量化提供了一种快速,选择性,敏感和容易的策略。

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  • 来源
    《RSC Advances》 |2015年第121期|共6页
  • 作者单位

    Guizhou Univ Natl Educ Minist China Engn &

    Res Ctr Southwest Biopharmaceut Resources Guiyang 550025 Peoples R China;

    Guizhou Univ Natl Educ Minist China Engn &

    Res Ctr Southwest Biopharmaceut Resources Guiyang 550025 Peoples R China;

    Guizhou Univ Natl Educ Minist China Engn &

    Res Ctr Southwest Biopharmaceut Resources Guiyang 550025 Peoples R China;

    Univ Macau Inst Chinese Med Sci State Key Lab Qual Res Chinese Med Taipa Macau Sar Peoples R China;

    Guizhou Univ Key Lab Macrocycl &

    Supramol Chem Guizhou Prov Guiyang 550025 Peoples R China;

    Guizhou Univ Key Lab Macrocycl &

    Supramol Chem Guizhou Prov Guiyang 550025 Peoples R China;

    Guizhou Univ Key Lab Macrocycl &

    Supramol Chem Guizhou Prov Guiyang 550025 Peoples R China;

    Guizhou Univ Key Lab Macrocycl &

    Supramol Chem Guizhou Prov Guiyang 550025 Peoples R China;

    Key Lab Chem Nat Prod Guizhou Prov Guiyang 550002 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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