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Development and validation of an analytical method for detecting chlorantraniliprole residues in fresh tea leaves

查看全文 作　　者：Tengfei [1]Liu;Minghui [2]Dong;Fengjie [1]Zhou;Daifeng [1]Yang;Xueming [2]Zhang 高影响力作者 机构地区：[1]Jiangsu Taihu Area Institute of Agricultural Sciences,Suzhou 215155,China;[2]Suzhou Agro-Products Quality and Safety Inspection and Test Center,Suzhou 215128,China高影响力机构 出　　处：《Food Science and Human Wellness》索引2019年第8卷第4期,共6页高影响力期刊 基　　金：Science and Technology Project of Suzhou(Grant Nos.:SNG201622 and SNG201644)。 摘　　要：An efficient method using multiwalled carbon nanotubes(MWCNTs)as dispersive solid-phase extraction sorbent was established for determining chlorantraniliprole residues in fresh tea leaves,which are known to be a troublesome matrix containing abundant pigments,via gas chromatography with an electron capture detector.Acetonitrile was used as the extraction solvent,with sodium chloride enhancing the analyte partition in the organic phase.The optimal mixture of MWCNTs and primary secondary amine(PSA)was based on the distribution of the target analyte recovery and on the clean-up efficiency;while matrix-matched calibration was recommended to combat the matrix effect.Mean recoveries of 95.2%–108.8%were obtained with intraday and interday precisions of less than 7.9%and 10.3%,respectively.Good linearity was observed for concentrations of 0.02–1.0 mg/kg with a correlation coefficient of 0.9984.The limits of detection and quantification were 0.005 mg/kg and 0.02 mg/kg,respectively.The method was employed to investigate the dissipation dynamics of chlorantraniliprole in fresh tea leaves with real field samples.Consequently,the dissipation rates of chlorantraniliprole in fresh tea leaves followed pseudo-first-order kinetics with a half-life of 1.9 d,and the average chlorantraniliprole residue content was below 0.02 mg/kg with a harvest withholding period of 14 d. 关 键 词：Multiwalled carbon nanotubes Fresh tea leaves CHLORANTRANILIPROLE Dispersive solid-phase extraction Gas chromatography
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