Pesticide residue analysis in crops by LC-MS/MS method
2015
Xingguo Chen (Dept. of Organic Chemistry, Qingdao University of Science and Technology, Tsingtao, China.) | Hongping Xue (Dept. of Organic Chemistry, Qingdao University of Science and Technology, Tsingtao, China) | Huiwen Wang (Dept. of Organic Chemistry, Qingdao University of Science and Technology, Tsingtao, China) | Hauitao Liug (Dept. of Organic Chemistry, Qingdao University of Science and Technology, Tsingtao, China.) | Zhide Hug (Dept. of Organic Chemistry, Qingdao University of Science and Technology, Tsingtao, China)
An LC-MS-MS assay is described for fluazifop residue analysis in crops. The residues are extracted with acidified organic solvent, the esters and conjugates are hy¬drolysed with 6.01 M hydrochloric acid, then the extracts are cleaned-up by solid phase extraction using C2(EC) and Si cartridges in tandem. Quantitative analysis is performed by gradient liquid chromatography coupled to triple quad- rupole mass spectrometer using atmospheric pressure chemical ionization. All fluazifop-P-butyl, free fluazifop- P and any conjugates are quantified as fluazifop-P. The limit of quantification is 0.012-0.054 mg/kg depending on crop matrices. The clean-up method is also suitable for LC-UV analysis with a compromise in higher limit of quantification 0.052-0.22 mg/kg.
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