Citation: ZHU Li, WANG Chen, CHEN Hong-Ping, ZHANG Ying-Bin, ZHOU Su-Juan, WANG Guo-Qing, LIU Xin. Simultaneous Determination of Plant Growth Regulators and Imidacloprid, Acetamiprid in Tea by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(4): 529-536. doi: 10.11895/j.issn.0253-3820.160808 shu

Simultaneous Determination of Plant Growth Regulators and Imidacloprid, Acetamiprid in Tea by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

Laboratory of Quality and Safety Risk Assessment for Tea Ministry of Agriculture, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China

Received Date: 4 November 2016
Revised Date: 20 February 2017

An efficient method for the analysis of multiclass plant growth regulators and pesticide (imidacloprid, acetamiprid) residues in tea was developed based on ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The samples were extracted with acetonitrile/formic acid (99:1, V/V) solution, cleaned up with four sorbents including C₁₈, strong anion exchanger (SAX), primary secondary amine (PSA) and anhydrous MgSO₄. The compounds were separated on a HSS T3 column under positive/negative electrospray ionization mode, detected by scheduled multiple reaction monitoring (SMRM), and quantified by matrix-matched external standard curves. All pesticide residues showed good linearity in the concentration range of 1-200 μg/L (6-benzylaminopurine, paclobutrazol, uniconazole, forchlorfenuron, mepiquat chloride, imidacloprid, acetamiprid) or 5-1000 μg/L (2,4-dichlor-ophenoxyacetic acid, 4-chlorophenoxyacetic acid, indole-3-acetic acid, gibberellic acid, 1-naphthaleneacetic acid, indole-3-butyric acid) , with correlation coefficient (R²≥0.99). Limits of detection (LOD, S/N=3) and limits of quantitation (LOQ, S/N=10) were 0.18-9.68 μg/kg and 0.61-32.26 μg/kg, respectively. In addition, the spiked recoveries of tea samples were 73.1%-108.9%, and RSDs were 0.6%-8.0%. This method was applied to commercial samples, and all the detections were confirmed by acquiring transitions for each pesticide in the samples.
- Tea,
- Plant growth regulator,
- Imidacloprid,
- Acetamiprid,
- Ultra performance liquid chromatography-tandem mass spectrometry,
- Dispersive solid phase extraction
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