title: Liquid-solid extraction coupled with magnetic solid-phase extraction for determination of pyrethroid residues in vegetable samples by ultra fast liquid chromatography.
abstract: In this study, liquid-solid extraction coupled with magnetic solid-phase extraction was successfully developed for the extraction of pyrethroid residues in vegetable samples. The analytes were determined by ultra fast liquid chromatography. The pyrethroids were extracted by liquid-solid extraction and then adsorbed onto magnetic adsorbent. Magnetic adsorbent, C18-functionalized ultrafine magnetic silica nanoparticles, was synthesized by chemical coprecipitation, silanization and alkylation. The analytes adsorbed onto the magnetic adsorbent can be simply and rapidly isolated from sample solution with a strong magnet on the bottom of the extraction vessel. The extraction parameters, such as liquid-solid extraction solvent, liquid-solid extraction time, the amount of magnetic adsorbent, magnetic solid-phase extraction time and magnetic solid-phase extraction desorption solvent, were optimized to improve the extraction efficiency. The analytical performances of this method, including linear range, detection limit, precision, and recovery were evaluated. The limits of detection for pyrethroid were between 0.63 and 1.2 ng g(-1). Recoveries obtained by analyzing the four spiked vegetable samples were between 76.0% and 99.5%. The results showed that the present method was a simple, accurate and high efficient approach for the determination of pyrethroids in the vegetable samples.
authors: College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
authors: Chunzhu
authors: C
authors: Jiang
authors: Ying
authors: Y
authors: Sun
authors: Xi
authors: X
authors: Yu
authors: Yan
authors: Y
authors: Gao
authors: Lei
authors: L
authors: Zhang
authors: Yuanpeng
authors: Y
authors: Wang
authors: Hanqi
authors: H
authors: Zhang
authors: Daqian
authors: D
authors: Song
mesh_terms: D000077102:Apium / Q000737:chemistry*; D001937:Brassica / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods; D058185:Magnetite Nanoparticles / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry; D011722:Pyrethrins / Q000032:analysis* / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction
chemical_list: D058185:Magnetite Nanoparticles; D010573:Pesticide Residues; D011722:Pyrethrins; D012822:Silicon Dioxide
keywords: C(18)-functionalized ultrafine magnetic silica nanoparticles; Liquid–solid extraction; Magnetic solid-phase extraction; Pyrethroid residues; Vegetable samples