Citation: YU Lu, SONG Wei, LÜ Yaning, ZHAO Muyu, ZHOU Fangfang, HU Yanyun, ZHENG Ping. Rapid determination of 204 pesticide residues in tea by ultra performance liquid chromatography coupled with quadrupole-time of flight mass spectrometry[J]. Chinese Journal of Chromatography, ;2015, 33(6): 597-612. doi: 10.3724/SP.J.1123.2015.02056 shu

Rapid determination of 204 pesticide residues in tea by ultra performance liquid chromatography coupled with quadrupole-time of flight mass spectrometry

YU Lu ^1,2 ,
SONG Wei ^2,3 ,
LÜ Yaning ^2,3 ,
ZHAO Muyu ^1,2 ,
ZHOU Fangfang ^1,2 ,
HU Yanyun ^2,3 ,
ZHENG Ping ^2,3,,

1.
1. College of Tea & Food Science and Technology, Anhui Agricultural University, Hefei 230036, China;

Corresponding author: ZHENG Ping,
Received Date: 5 February 2015

Fund Project: 安徽省自然科学基金项目(1408085MKL96,1408085MKL97) (1408085MKL96,1408085MKL97)国家质检总局科研课题(AHCIQ_2014IK130). (AHCIQ_2014IK130)

An analytical method was established for the simultaneous determination of 204 pesticide residues in tea by ultra performance liquid chromatography coupled with quadrupole-time of flight mass spectrometry (UPLC-Q-TOF/MS). The samples were extracted with acetonitrile, and cleaned-up by solid phase extraction (SPE) with a Carb-PSA cartridge, eluted with acetonitrile-toluene (3:1, v/v), determined by UPLC-Q-TOF/MS and quantified by external standard method. A data base of the accurate mass numbers and a library which contains the 204 pesticides were established. The automatic retrieval of detection results was carried on according to the characteristics of the compound, such as accurate mass, retention time, isotopic ratio, and so on. Based on the above results, the qualitative identifications of the 204 pesticides were accomplished without the contrast of standard substances. The results indicated that this method can be used to determine the 204 pesticides in tea. At the three spiked levels of 10, 20, 50 μg/kg, mean recoveries for the 204 pesticides in tea were between 68.1% and 117.2%, with the relative standard deviations (RSDs) ranging from 3.1% to 18.9%. The limits of quantification for the 204 pesticides were lower than 10 μg/kg. The method has been applied to four positive samples, and the results generally accord with the detection results by the method of GB/T 23205-2008. This method has the characteristics of high efficiency, as well as high sensitivity and accuracy, which can meet the requirement of the determination of the 204 pesticides in tea.
- ultra performance liquid chromatography-quadrupole-time of flight mass spectrometry (UPLC-Q-TOF/MS),
- pesticides,
- multi-residues,
- tea
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