期刊
FOOD CHEMISTRY
卷 202, 期 -, 页码 389-395出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.01.143
关键词
Insecticides; Neonicotinoids; Spirocyclic tetronic/tetramic acid derivatives; Vegetables; Fruits; Dispersive liquid-liquid microextraction; Liquid chromatography-tandem mass spectrometry
资金
- Ramon and Cajal Subprogram
- Comunidad Autonoma de la Region de Murcia (Fundacion Seneca) [15217/PI/10]
Dispersive liquid-liquid microextraction was used to preconcentrate three spirocyclic tetronic/tetramic acid derivatives (spirotetramat, spiromesifen and spirodiclofen) and five neonicotinoid (thiamethoxam, chlotianidin, imidacloprid, acetamiprid and thiacloprid) insecticides previously extracted from fruit and vegetable matrices with acetonitrile. The organic enriched phase was evaporated, reconstituted in 25 mu L acetonitrile and analyzed by reversed-phase liquid chromatography with tandem mass spectrometry using a triple quadrupole in selected reaction monitoring mode. Enrichment factors in the 15-100 range were obtained. A matrix effect was observed, the detection limits varying between 0.025 and 0.5 ng g(-1), depending on the compound and the sample matrix. The developed method was applied to the analysis of 25 samples corresponding to five different fruit and vegetable matrices. Only thiamethoxam was detected in a lemon sample at a concentration close to the quantification limit, and spiromesifen and spirotetramat at concentrations between 11.6 and 54.5 ng g(-1). (C) 2016 Elsevier Ltd. All rights reserved.
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