A modified QuEChERS method was developed for the simultaneous analysis of tylosin (Tyl) and metronidazole (MNZ) residues in shrimp samples using LC-ESI-MS/MS. The sample extraction procedure based on QuEChERS, cleanup dispersive solid-phase (dSPE). Octadecyl (C18) primary secondary amine (PSA) sorbents were used dSPE cleanup. Analyte chromatographic separations carried out a ZORBAX RRHD Eclipse...


 ABSTRACT. Optimized QuEChERS (quick, easy, cheap, effective, rugged and safe) method of sample preparation was employed for five selected pharmaceutical compounds on its advantage simplicity, less extraction solvent time. Different parameters affecting the efficiency target analyte optimized. Since developed pesticides, uses pharmaceuticals need modification evaluation different paramete...

Two rapid methods of sample preparation and analysis of fatty foods (e.g., milk, eggs, and avocado) were evaluated and compared for 32 pesticide residues representing a wide range of physicochemical properties. One method, dubbed the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for pesticide residue analysis, entailed extraction of 15 g sample with 15 mL acetonitrile (MeCN)...

Abstract Mycotoxins are secondary metabolites produced by various fungi and known to have a significant negative impact on human animal health. When feedstuffs contaminated with mycotoxins, their toxicities may be caused variety of diseases. In this study, the residual mycotoxins in were analyzed using LC–MS/MS incorporated QuEChERS extraction. Analytical method validation was performed for LOD...

A fast and simple modified QuEChERS (quick, easy, cheap, rugged and safe) extraction method based on spiked calibration curves and direct sample introduction was developed for determination of benzo[a]pyrene (BaP) in bread by gas chromatography-mass spectrometry single quadrupole selected ion monitoring (GC/MS-SQ-SIM). Sample preparation includes extraction of BaP into acetone followed by clean...

Extensive and misuse of pesticides can cause to toxicity humans pollution in the environment. The primary objective this study was determine insecticide load agricultural soils Troia, located Troia National Park Çanakkale Province (Türkiye) by QuEChERS method. For method verification, blank soil samples were spiked at two levels pesticides. overall recovery 84.8% with a relative standard deviat...

For the first time, a multi-residue methodfor simultaneous determination of 41LC-amenable pesticides in rice, belonging to different chemical classes has been developed in Iran by LC-MS/MS. The pesticides were analyzed simultaneously in a single run using positive electrospray ionization with multiple reaction monitoring (MRM) after extraction with slightly modified QuEChERS method. The calibra...

Limit=250 words To accurately estimate exposure of bees to pesticides, analytical methods are needed to enable quantification of ng/g (ppb) levels of contaminants in small samples of pollen or the individual insects. A modified QuEChERS extraction method coupled with ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) analysis was tested to quantify residues of 1...