Journal
RSC ADVANCES
Volume 5, Issue 121, Pages 100316-100321Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra18335a
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Funding
- National Natural Science Foundation of China [21202026, 21562015]
- Natural Science Fund of the Science and Technology Department of Guizhou Province [JZ-2014-2005, 20132107]
- Young Talent Development Project of Guizhou Province [2012154]
- National Major Scientific Instruments Development Project [2011YQ12003506]
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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.
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