Inventors: Chen DJ, Chen LN, Chen XM, Dou SH, Li F, Lu Q, Luo J, Nie L, Peng Y, Xie Y
Patent Title: Preparation method of molecularly imprinted polymer on nano-silica gel surfaces of sulfonylurea herbicides
Publication date: 2010
Publication number: CN101757896

Abstract: The invention relates to a preparation method of a molecularly imprinted polymer on nano-silica gel surfaces of sulfonylurea herbicides, which comprises the following steps: preparing SiO2 pellets; ultrasonically dispersing the prepared SiO2 pellets into a toluene solution of gamma-methacryloxypropyl trimethoxy silane, and carrying out backflow reaction to obtain modified SiO2 pellets; adding template molecules and functional monomers into a polymerization solvent and fully shaking up to obtain a pre-assembled solution; ultrasonically dispersing the modified SiO2 pellets into the polymerization solvent, and adding cross-linking agent, initiating agent and the pre-assembled solution; mixing, carrying out ice bath ultrasonic treatment, stirring, introducing N2 for removing oxygen, carrying out temperature programming thermal-initiated polymerization under the N2 atmosphere, centrifuging and removing supernatant liquid; and ultrasonically washing precipitates sequentially with a methanol-acetic acid solution and methanol to obtain polymer pellets the template molecules of which are removed. The molecularly imprinted polymer pellets prepared by the invention not only have specific recognition capability for the template molecules and analogs thereof but also have excellent characteristics of enrichment and recovery, thus the molecularly imprinted polymer pellets can be used as dispersed solid phase extraction materials for separating and enriching the sulfonylurea herbicides in environment, food and other complex samples.
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