title: Application of magnetic solvent bar liquid-phase microextraction for determination of organophosphorus pesticides in fruit juice samples by gas chromatography mass spectrometry.
abstract: A simple, rapid and sensitive sample pretreatment technique, magnetic solvent bar liquid-phase microextraction (MSB-LPME) was developed for extracting organophosphorus pesticides from fruit juice. The analytes were extracted from the sample to the organic solvent immobilized in the fiber. The magnetic solvent bar not only can be used to stir the samples but also extract the analytes. After extraction, the analyte-adsorbed magnetic solvent bar can be readily isolated from the sample solution by a magnet, which could greatly simplify the operation and reduce the whole pretreatment time. The bar was eluted with methanol. The elute was evaporated to dryness and residue was dissolved in hexane. Several experimental parameters were investigated and optimized, including type of extraction solvent, number of magnetic solvent bar, extraction temperature, extraction time, salt concentration, stirring speed, pH and desorption conditions. The recoveries were in the range of 81.3-104.6%, and good reproducibilities were obtained with relative standard deviation below 6.1%.
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Lijie
authors.initials: L
authors.lastname: Wu
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Song
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Mingzhu
authors.initials: M
authors.lastname: Hu
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Hanqi
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Aimin
authors.initials: A
authors.lastname: Yu
authors.affiliation: School of Chemical and Materials Engineering, Yanching Institute of Technology, Langfang 065201, China.
authors.forename: Cui
authors.initials: C
authors.lastname: Yu
authors.affiliation: Chinese Academy of Inspection and Quarantine, Beijing 100123, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ma
authors.affiliation: College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China. Electronic address: wangziming@jlu.edu.cn.
authors.forename: Ziming
authors.initials: Z
authors.lastname: Wang
mesh_terms: D001628:Beverages / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D059627:Liquid Phase Microextraction / Q000379:methods*; D060328:Magnetic Phenomena; D010575:Pesticides / Q000032:analysis*; D012997:Solvents / Q000737:chemistry
chemical_list: D010575:Pesticides; D012997:Solvents
keywords: Fruit juice; Gas chromatography mass spectrometry; Magnetic solvent bar liquid-phase microextraction; Organophosphorus pesticides