Development of a Simultaneous Analytical Method for Diquat, Paraquat and Chlormequat in Animal Products Using UPLC‐MS/MS

Abstract

BACKGROUND:The residual analysis of polar pesticides has remained a challenge. It is even more difficult to simultaneously analyze multiple polar pesticides. Diquat, paraquat, and chlormequat are typical examples of highly polar pesticides. The existing methods for the analysis of diquat, paraquat and chlormequat are complex and time consuming. Therefore, a simple, quick and effective method was developed in the represent study for simultaneous analysis of diquat, paraquat and chlormequat in animal products, meat and fat using UPLC-MS/MS. METHODS AND RESULTS: Sample extraction was carried out using acidified acetonitrile and water and reextracted with acidified acetonitrile and combine the extracts followed by centrifugation. The extract was then cleaned up with a HLB cartridge after reconstitution with acidic acetonitrile and water. The method was validated in quintuplicate at three different concentrations. The limits of detection (LOD) and quantification (LOQ) were 0.0015 and 0.005 mg/L, respectively. Matrix suppression effect was observed for all of the analytes. A seven point matrix matched calibration curve was constructed for each of the compound resulted excellent linearity with determination coefficients (R 2 ) ≥ 0.991. Accuracy and precision of the method was calculated from the recovery and repeatability and ranged from 62.4 to 119.7% with relative standard deviation less than 18.8%.

Phytotoxicity and Translocation of Residual Diquat Dibromide from Sandy Loam and Loam Soil to Following Crops Cultivating in the Soils

“…Diquat dibromide was analyzed using liquid chromatography QTRAP (LC-MS/MS) [11]. The detection of diquat dibromide in soils and crops has been carried out as same as residue analytical method for livestock Using UPLC-MS/MS [12].…”