Studies on the Supramolecular Interaction Between Tetramethrin and β‐Cyclodextrin by Spectrofluorimetry and Its Analytical Application

Abstract

The supramolecular interaction between tetramethrin and β‐cyclodextrin (β‐CD) has been studied by spectrofluorimetry. The results show that β‐CD reacts with tetramethrin to form an inclusion complex with an association constant of 40.3 L mol⁻¹. The composition of the complex is 1:1(β‐CD:tetramethrin). Based on the significant enhancement of fluorescence intensity of tetramethrin in inclusion complex, a spectrofluorimetric method with high sensitivity and selectivity was developed for the determination of tetramethrin in aqueous solution. Under the optimum conditions, the complex had maximum excitation and emission wavelengths at 295 and 356 nm, respectively. The linear range of the method was 11–1500 ng mL⁻¹ with a detection limit of 3.4 ng mL⁻¹. The proposed method was successfully used to determine trace amount of tetramethrin in river water.

Keywords:

• Tetramethrin
• β‐cyclodextrin
• Supramolecular interaction
• Spectrofluorimetry

Acknowledgments

This work was supported by the Natural Science Foundation of China (No. 29975016) and the Important Natural Science Foundation of Shandong Province, China (No.Z2000B03).