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Li S.,Chinese Academy of Agricultural Sciences | Li S.,Laboratory of Quality and Safety Risk Assessment for Tropical Products Haikou | Li S.,Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables | Yin G.,Chinese Academy of Agricultural Sciences | And 17 more authors.
Biosensors and Bioelectronics | Year: 2015

A novel fluorescence switch sensor wasconstructed for detecting the fungicide fenaminosulf (FM), based on a dye-doped molecularly imprinted polymer (MIP) and silver nanofilm amplification. The MIP was prepared by electropolymerization of hydroquinone doped with neutral red on the silver nanofilm modified electrode. A fluorescence signal was produced by the neutral red and the fluorescence intensity was diminished by the ion pair that formed via electrostatic forces between FM and the dye. Therefore, elution and adsorption of FM by the MIP acted as a switch to control the fluorescence intensity, which was effectively amplified by the silver nanofilm. The decrease in fluorescence intensity was linear with the FM concentration, establishing a new method for FM detection. Under optimal conditions, good linear correlation was obtained for FM concentrations over the range from 2.0×10-10 to 4.0×10-8mol/L, with a detection limit of 1.6×10-11mol/L. This method was utilized to determine residual FM in vegetable samples, and recoveries ranging from 92.0% to 110% were obtained. © 2015 Elsevier B.V. Source

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