title: Microwave-assisted preparation of poly(ionic liquids)-modified magnetic nanoparticles for pesticide extraction.
abstract: Novel poly(ionic liquids) were synthesized and immobilized on prepared magnetic nanoparticles, which were used to extract pesticides from fruit and vegetable samples by dispersive solid-phase extraction prior to high-performance liquid chromatography analysis. Compared with monomeric ionic liquids, poly(ionic liquids) have a larger effective contact area and higher viscosity, so they can achieve higher extraction efficiency and be used repeatedly without a decrease in analyte recovery. The immobilized poly(ionic liquids) were rapidly separated from the sample matrix, providing a simple approach for sample pretreatment. The nature and volume of the desorption solvent and amount of poly(ionic liquid)-modified magnetic material were optimized for the extraction process. Under optimum conditions, calibration curves were linear (R(2) > 0.9988) for pesticide concentrations in the range of 0.100-10.000 μg/L. The relative standard deviations for repeated determinations of the four analytes were 2.29-3.31%. The limits of detection and quantification were 0.29-0.88 and 0.97-2.93 μg/L, respectively. Our results demonstrate that the developed poly(ionic liquid)-modified material is an effective absorbent to extract pesticides from fruit and vegetable samples.
authors.affiliation: College of Science, Beijing University of Chemical Technology, Beijing, 100029, P.R. China.
authors.forename: Ruizhe
authors.initials: R
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Su
authors.forename: Lu
authors.initials: L
authors.lastname: Yang
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D005506:Food Contamination / Q000032:analysis; D005638:Fruit / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry; D008872:Microwaves; D010575:Pesticides / Q000032:analysis / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D014675:Vegetables / Q000737:chemistry*
chemical_list: D052578:Ionic Liquids; D058185:Magnetite Nanoparticles; D010575:Pesticides
keywords: Dispersive solid-phase extraction; High-performance liquid chromatography; Magnetic nanoparticles; Microwave-assisted extraction; Poly(ionic liquids)