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Reduction of matrix effects through a simplified QuEChERS method and using small injection volumes in a LC-MS/MS system for the determination of 28 pesticides in fruits and vegetables

文献类型： 外文期刊

作者： Li, Honge 1 ; Wang, Chenchen 1 ; Zhu, Qian 2 ; Du, Hongxia 2 ; Guan, Shuai 2 ; Wang, Fengen 2 ; Zhang, Wenjun 2 ; Fan, We 1 ;

作者机构： 1.Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China

2.Shandong Acad Agr Sci, Cent Lab, Key Lab Test Technol Food Qual & Safety Shandong, Base Publ Serv Pesticide Residues Shandong Prov, Jinan 250100, Peoples R China

3.Shand

期刊名称：ANALYTICAL METHODS （ 影响因子：2.896； 五年影响因子：2.716 ）

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收录情况： SCI

摘要： A simplified QuEChERS method coupled with a small injection volume was developed for the simultaneous determination of 28 pesticides in 6 matrices (apples, cucumbers, tomatoes, luffa, cabbages, and eggplants) using LC-MS/MS. In the sample procedure, acetonitrile with 0.1% (v/v) formic acid was used to extract and no depurative powder was used. Three fortified levels (10, 50, and 100 mu g kg(-1)) were determined and the recoveries of 168 analyte/matrix combinations were in the range of 60-120% except for cyromazin, pendimethalin, and fenpropathrin. Half of the 168 LOQs were below 0.1 mu g kg(-1), and 29 LOQs were above 1 mu g kg(-1). Moreover, four relationships between signal suppression and injection volume were observed ranging from 0.5 mu L to 15 mu L. For many analyte/matrix combinations, the matrix effects could be reduced to less than 20% if the injection volume was less than a critical value (named critical volume). The critical volume depending on the initial extent of matrix effects was explored and the conclusion was: for weak or medium MEs, usually <= 2 mu L injection volume was needed and for several weak MEs, injection volume <= 5 mu L can reduce the matrix effect to a negligible level.

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