Rapid and reliable multiresidue analytical methods were developed and validated for the determination of 6 neonicotinoids pesticides (acetamiprid, clothianidin, imidacloprid, nitenpyram, thiacloprid, and thiamethoxam) in honey. A modified QuEChERS method has allowed a very rapid and efficient single-step extraction, while the detection was performed by UHPLC/MS-MS. The recovery studies were car...

This application note describes a fast analytical method for determination of halosulfuron-methyl using QuEChERS and capillary electrophoresis tandem mass spectrometry (CE/MS/MS). The method was developed and validated for halosulfuron-methyl in green and yellow bell peppers. It showed good linearity (R2 > 0.999) from 5.0 to 500 ppb for the analytical curves prepared in background electrolyte a...

Chiral pesticides with S atoms as asymmetric centers are gaining great importance in the search for new modes of action. As rest chiral pesticides, determination stereoisomers separately has become crucial environmental risks assessment these pesticides. Therefore, development suitable extraction and clean-up methods well efficient stereoselective analytical techniques samples is essential. Cur...

Residue levels of dimethoate and its oxon metabolite (omethoate) during tea planting, manufacturing, and brewing were investigated using a modified QuEChERS sample preparation and gas chromatography. Dissipation of dimethoate and its metabolite in tea plantation followed the first-order kinetic with a half-life of 1.08-1.27 d. Tea manufacturing has positive effects on dimethoate dissipation. Pr...

A rapid, high-throughput method employing ultra-performance liquid chromatography with tandem quadrupole mass spectrometry (UPLC-MS/MS) was developed and optimized for simultaneous quantification and confirmation of 64 pesticide residues and their toxic metabolites in fruit extracts prepared by a buffered QuEChERS procedure. The total time required for UPLC-MS/MS analysis was 8 min plus 2 min f...

This application note describes a sensitive and reliable method for determination of 20 polyfluoroalkane substances (PFASs) in milk based on the work published by Yu, et al. previously [1]. The milk sample was initially extracted and cleaned up using an optimized QuEChERS protocol, followed by an online interference trapping LC-MS/MS analysis. Using stable isotope labeled internal standards for...

A rapid and sensitive single residual method (SRM) for the determination of ethephon which resemble a very polar, non-QuEChERS-amenable and plant growth regulator was developed. This method is applicable for determination of ethephon in vegetables, fruits and herbs. This method is simply based on extraction of ethephon with deionized water with using an equal amount of dichloro methane in order...