title: Core-shell magnetic molecularly imprinted polymers as sorbent for sulfonylurea herbicide residues.
abstract: Sulfonylurea herbicides are widely used at lower dosage for controlling broad-leaf weeds and some grasses in cereals and economic crops. It is important to develop a highly efficient and selective pretreatment method for analyzing sulfonylurea herbicide residues in environments and samples from agricultural products based on magnetic molecularly imprinted polymers (MIPs). The MIPs were prepared by a surface molecular imprinting technique especially using the vinyl-modified Fe3O4@SiO2 nanoparticle as the supporting matrix, bensulfuron-methyl (BSM) as the template molecule, methacrylic acid (MAA) as a functional monomer, trimethylolpropane trimethacrylate (TRIM) as a cross-linker, and azodiisobutyronitrile (AIBN) as an initiator. The MIPs show high affinity, recognition specificity, fast mass transfer rate, and efficient adsorption performance toward BSM with the adsorption capacity reaching up to 37.32 mg g(-1). Furthermore, the MIPs also showed cross-selectivity for herbicides triasulfuron (TS), prosulfuron (PS), and pyrazosulfuron-ethyl (PSE). The MIP solid phase extraction (SPE) column was easier to operate, regenerate, and retrieve compared to those of C18 SPE column. The developed method showed highly selective separation and enrichment of sulfonylurea herbicide residues, which enable its application in the pretreatment of multisulfonylurea herbicide residues.
authors: Shan Shan
authors: SS
authors: Miao
authors: Mei Sheng
authors: MS
authors: Wu
authors: §Jiangxi Entry and Exit Inspection and Quarantine Bureau, Nanchang 330002, China.
authors: Hai Gen
authors: HG
authors: Zuo
authors: Chen
authors: C
authors: Jiang
authors: She Feng
authors: SF
authors: Jin
authors: Yi Chen
authors: YC
authors: Lu
authors: Hong
authors: H
authors: Yang
mesh_terms: D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000737:chemistry / Q000302:isolation & purification*; D008280:Magnetics; D054802:Molecular Imprinting; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D013453:Sulfonylurea Compounds / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006540:Herbicides; D011108:Polymers; D013453:Sulfonylurea Compounds
keywords: adsorption; complex environmental media; magnetic MIPs; sulfonylurea herbicides residues; vinyl-modified Fe3O4@SiO2