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Journal of Tea Science ›› 2018, Vol. 38 ›› Issue (4): 416-424.doi: 10.13305/j.cnki.jts.2018.04.010

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Determination of Phthalimide Residue in Tea Using Gas Chromatography-tandem Mass

GAO Guanwei1, CHEN Hongping1, CHAI Yunfeng1, JIN Lili1,2, LIU Xin1, LU Chengyin1,*   

  1. 1. Tea Research Institute, Chinese Academy of Agricultural Sciences, Tea Quality and Supervision Testing Center, Key Laboratory of Tea Quality and Safety Control, Ministry of Agriculture R. P. China, Hangzhou 310008, China;
    2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2018-02-07 Revised:2018-03-07 Online:2018-08-15 Published:2019-10-15

Abstract: As folpet residues, phthalimide (PI) and folpet were responsible for a high risk of false positive detection of folpet in tea, which became a major factor restricting the export of Chinese tea. A modified QuEChERS method for the determination of PI residue in tea using gas chromatography-tandem mass was developed and validated. The target analyte was extracted using acetonitrile and the crude extracts were purified using multiwalled carbon nanotubes, octadecyl silica and strong cation exchanger. At the spiked levels of 10, 20, 50 and 100βμg∙kg-1, the average recoveries were from 73% to 104%, and the relative standard deviations were below 20%. The limit of quantification of PI in tea was 10.0βμg∙kg-1. The method was simple, reliable, accurate, sensitive and appropriate for the determination of PI residue in tea.

Key words: tea, phthalimide, QuEChERS, gas chromatography-tandem mass

CLC Number: