Abstract
A method for the determination of paraquat by cucurbit[7]uril (CB[7]) fluorescence quenching was developed. The assay was based on the reaction of the CB[7] with acridine orange. The fluorescence intensity of acridine orange regularly increased with the addition of CB[7]. However, while an appropriate amount of paraquat was added to the CB[7]- acridine orange system, the fluorescence intensity of the system was quenched which was employed to determine paraquat. Under the optimum conditions, a linear range of 3.0–800 nmol L−1 and a detection limit of 1.61 nmol L−1 for paraquat were obtained. The simple strategy reported here offers great practical potential for the determination of pesticide residues in agricultural products.
Acknowledgments
This work was supported by Natural Science Foundation of China. (20875002).