Citation: WU Gang, DONG Suozhuai, PAN Lulu, ZHAO Shanhong, WANG Lijun, GUO Fanglong, LI Dan. Determination of eight defoliant residues in cotton by accelerated solvent extraction coupled with ultra performance liquid chromatography-tandem mass spectrometry[J]. Chinese Journal of Chromatography, ;2013, 31(7): 697-702. doi: 10.3724/SP.J.1123.2012.12038 shu

Determination of eight defoliant residues in cotton by accelerated solvent extraction coupled with ultra performance liquid chromatography-tandem mass spectrometry

WU Gang ^1,, ,
DONG Suozhuai ² ,
PAN Lulu ² ,
ZHAO Shanhong ¹ ,
WANG Lijun ³ ,
GUO Fanglong ³ ,
LI Dan ³

1.
1. Zhejiang Academy of Science and Technology for Inspection & Quarantine, Hangzhou 310015, China;

Corresponding author: WU Gang,
Received Date: 25 December 2012

Fund Project: 国家公益性项目(201110041) (201110041)国家质检总局科研项目(2010IK096). (2010IK096)

A novel method has been developed for the rapid extraction and determination of eight defoliants including thidiazuron, butiphos, methabenzthiazuron, abscisic acid, carfentrazone-ethyl, diuron, paraquat, and pyrithiobac-sodium in cotton by accelerated solvent extraction (ASE) coupled with ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The defoliants in cotton were extracted by ASE and the extracts were dried by a rotavapor, then redissolved in the solvents of acetonitrile and water (1:9, v/v). The chromatographic analysis was performed on an Acquity UPLC^® HSS T3 column (50 mm×2.1 mm, 1.8 μ m) by a gradient elution employing of acetonitrile and 0.05% (v/v) formic acid as mobile phases. The analytes were detected by electrospray ionization (ESI) tandem mass spectrometry with multiple reaction monitoring (MRM) in positive ion mode. Good linearities (r >0.99) were observed between 0.01 and 0.3 mg/L for all the compounds. The recoveries and relative standard deviations (RSDs) were obtained by spiking untreated samples with the eight defoliants at 0.1, 0.5 and 1.0 mg/kg. The average recoveries of the eight defoliants were from (84.18±8.04)% to (95.99±6.76)%. The precision values expressed as RSDs were from 7.04% to 10.60% (n=6). The limits of detection were 0.8-29 μ g/kg and the limits of quantification were 2.5-96 μ g/kg for the analytes. The results showed that the method is simple, rapid, sensitive and accurate, and is suitable for the quantitative determination and confirmation of the eight defoliants in cotton.
- accelerated solvent extraction (ASE),
- ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS),
- defoliants,
- cotton
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