中文摘要：本研究通过稀释法和改进的QuEChERS法消除了六种茶样本的基体效应，并应用UPLC-MS/MS法检测六种茶样本中八个新烟碱类杀虫剂（呋虫胺、烯啶虫胺、吡虫啉、噻虫嗪、噻虫胺、氯噻啉、啶虫脒、和噻虫啉）的残留量。研究结果发现在0.01-0.5 mg/kg的加标水平下，6种茶样本中8种杀虫剂的回收率均在66.3～108%之间，而且所有回收实验的相对标准偏差均低于16%。
外文摘要：Liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) is a primary tool for analysis of low volatility compounds in complex matrices. However, complex matrices, such as different types of tea, complicate analysis through ionization suppression or enhancement. In this study, sample preparation by a refined QuEChERS method combined with a dilution strategy removed almost all matrix effects caused by six types of tea. Tea samples were soaked with water and extracted with acetonitrile, cleaned up with a combination of PVPP (160 mg) and GCB (20 mg), and dried. Dried extracts were diluted with 20 mL acetonitrile/water (15:85, v/v) before analysis by UPLC-MS/MS. The average recoveries of eight neonicotinoid insecticides (dinotefuran, nitenpyram, thiamethoxam, imidacloprid, clothianidin, imidaclothiz, acetamiprid, and thiacloprid) ranged from 66.3 to 108.0% from tea samples spiked at 0.01-0.5 mg kg(-1). Relative standard deviations were below 16% for all recovery tests. The limit of quantification ranged from 0.01 to 0.05 mg kg(-1). (C) 2016 Elsevier Ltd. All rights reserved.
外文关键词：Organophosphorous pesticides；Elevated temperature dispersive liquid–liquid microextraction；Gas chromatography; Aqueous sample
作者：Weiting Jiao；Yu Xiao；Xiaosan Qian
作者单位：State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, PR China
期刊名称：FOOD CHEMISTRY
期刊影响因子：4.052
出版年份：2016
出版刊次：4
点击下载：优化稀释法和QuEChERS法的组合消除8种新烟碱类杀虫剂UPLC-MS/MS检测过程中6种不同茶样本的基体效应