A molecularly imprinted fluorescence sensor was prepared for the selective determination of the pyrethroid pesticide metabolite 3-phenoxybenzaldehyde.Fluorescent molecularly imprinted polymers were successfully synthesized by sol-gel method on the surface of Mn doped ZnS quantum dots

with 3-phenoxybenzaldehyde as template molecule

3-aminopropyl triethoxysilane and tetraethyl orthosilicate as functional monomer and cross linker

respectively.The polymers were characterized by infrared spectroscopy

X-ray diffraction and X-ray photoelectron spectroscopy

and the detection conditions were optimized.Results showed that under the optimal conditions

the linear response range for the fluorescence sensor to 3-phenoxybenzaldehyde ranged from 0.3 μmol/L to 5 μmol/L

with a detection limit of 0.267 μmol/L.Combined with the enzymatic hydrolysis process of pesticides

this molecularly imprinted fluorescence sensor could be used in the rapid detection of pyrethroidpesticides.Results indicated that recoveries for 3-phenoxybenzaldehyde were in the range of 84.0%-119%

with the relative standard deviations not more than 5.0%.The prepared molecularly imprinted fluorescence sensor could be used for the determination of 3-phenoxybenzaldehyde in food.