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Journal of Tea Science ›› 2021, Vol. 41 ›› Issue (5): 717-730.doi: 10.13305/j.cnki.jts.20210804.001

• Research Paper • Previous Articles     Next Articles

Rapid Determination of 24 Pesticide Residues in Tea by in-Syringe Dispersive Solid Phase Extraction-Ultra High Performance Liquid Chromatography-Tandem Mass Spectrometry

MA Jiali1,2,3,4, WANG Chen1,3,4,*, CHEN Hongping1,3,4, CHAI Yunfeng1,3,4, ZHU Li1,3,4, LIU Xin1,3,4,*   

  1. 1. Tea Research Institute, Chinese Academy of Agriculture Sciences, Hangzhou 310008, China;
    2. Graduate School, Chinese Academy of Agriculture Sciences, Beijing 100081, China;
    3. Key Laboratory of Tea Quality and Safety Control, Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China;
    4. Laboratory of Quality and Safety Risk Assessment for Tea Products (Hangzhou), Ministry of Agriculture and Rural Affairs, Hangzhou 310008, China
  • Received:2021-02-01 Revised:2021-03-01 Online:2021-10-15 Published:2021-10-12

Abstract: Based on the characteristics of tea matrix, a rapid pretreatment technology of in-syringe dispersive solid phase extraction (dSPE) was developed, and an analytical method based on ultra high performance liquid chromatography-tandem mass spectrometry was established for the detection of 24 pesticide residues in tea. Tea samples were extracted using acetonitrile, salted-out with MgSO4, purified with primary secondary amine and graphitized carbon black as dispersive adsorbents in designed syringe devices, and detected by UPLC-MS/MS. Recoveries of 24 pesticides in black and green teas were 61.7%-98.8% at three spiked levels (0.01βmg·kg-1, 0.05βmg·kg-1 and 0.5βmg·kg-1), which indicated high accuracy with the relative standard deviations of 0.4%-5.5%. The calibration curves of 24 pesticides in black and green teas showed good linearity with correlation coefficients (R2) higher than 0.995. The limits of detection (LOD) and the limits of quantitation (LOQ) were 0.05-5.36βμg·kg-1 and 0.18-17.86βμg·kg-1, respectively, which show high sensitivity of this method. Being simple, fast, less instrument required and time-saving, this method is suitable for quantification of multiple pesticide residues in tea.

Key words: tea, ultra high performance liquid chromatography-tandem mass spectrometry, pesticide residues, in-syringe dispersive solid phase extraction

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