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Food Chem. 2015 Jun 1;176:197-204. doi: 10.1016/j.foodchem.2014.12.055. Epub 2014 Dec 24.

Application of magnetic solvent bar liquid-phase microextraction for determination of organophosphorus pesticides in fruit juice samples by gas chromatography mass spectrometry.

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College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
School of Chemical and Materials Engineering, Yanching Institute of Technology, Langfang 065201, China.
Chinese Academy of Inspection and Quarantine, Beijing 100123, China.
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China. Electronic address:


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%.


Fruit juice; Gas chromatography mass spectrometry; Magnetic solvent bar liquid-phase microextraction; Organophosphorus pesticides

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