State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China.
College of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
J Agric Food Chem. 2021 Jan 13;69(1):584-591. doi: 10.1021/acs.jafc.0c05577. Epub 2020 Dec 30.
According to a simple guest-replacement fluorescence turn-on mechanism, we constructed a fluorescent probe system based on cucurbit[10]uril (Q[10]) and protonated acridine () to detect the pesticide dodine (). Formation of a homoternary inclusion complex @Q[10] in both aqueous solution and solid state was studied by means of H NMR spectroscopy and X-ray crystallography. Although can emit strong fluorescence in aqueous solution, the homoternary inclusion complex @Q[10] does not exhibit any fluorescence. Upon the addition of the pesticide into the aqueous solution of @Q[10], the molecules in the Q[10] cavity are displaced by the pesticide , and strong fluorescence recovers. The fluorescent probe system based on Q[10] and provided a wide determination of from 0 to 4.0 × 10 mol·L with a low limit of detection of 1.827 × 10 mol·L. The guest-replacement fluorescence turn-on mechanism is also confirmed by H NMR spectroscopy. Further, the fluorescent probe can directly detect residues in real agricultural products, and obvious fluorescence signal was observed under UV irradiation.
根据一个简单的客体取代荧光开启机制，我们构建了一个基于葫芦[10]脲（Q[10]）和质子化吖啶（）的荧光探针体系，以检测农药敌菌丹（）。通过 H NMR 光谱和 X 射线晶体学研究了在水溶液和固态中形成同三聚体包合络合物@Q[10]的过程。尽管在水溶液中可以发射强荧光，但同三聚体包合络合物@Q[10]本身没有任何荧光。当将农药添加到@Q[10]的水溶液中时，农药将 Q[10]腔中的分子取代，从而恢复强荧光。基于 Q[10]和的荧光探针体系提供了从 0 到 4.0×10 mol·L-1 的广泛测定范围，检测限低至 1.827×10 mol·L-1。客体取代荧光开启机制也通过 H NMR 光谱得到了证实。此外，荧光探针可以直接检测实际农产品中的残留，在紫外光照射下可以观察到明显的荧光信号。
