H-B Instruments

Special products for determination of pesticides in food samples QuEChERS method and pre-mixes Within a few years after its development by Anastassiades et al. the QuEChERS method has gained a leading position for the determination of pesticide residues in food samples by GC-MS or LC-MS, allowing rapid and cheap clean-up of strongly matrix-contaminated samples. For optimizing the extraction of pH-dependent compounds, for minimizing decomposition of sensitive substances, and for broadening the matrix spectrum, different modifications of the QuEChERS method have been elaborated. MACHEREY-NAGEL offers a number of individually weighed and premixed extraction (buffered or non-buffered) and clean-up mixtures, specially composed for different sample matrices. Features Special SPE phase for quick and cheap determination of pesticides in strongly matrix-contaminated samples by GC-MS and LC-MS QuEChERS method = Quick Easy Cheap Effective Rugged Safe Different sizes (e.g., 2 mL, 15 mL centrifuge tubes), aluminum bags For clean-up, the Diamino phase (PSA) removes, polar compunds e.g., sugars and organic acids. Primary and Secondary Amine functions (PSA) Magnesium sulfate removes water C18 ec removes nonpolar interferences such as fats and the Carbon phase removes pigments, sterols, and nonpolar interferences. and further compounds for clean-up mixes Extraction mixes European standard EN 15662 recommends a citrate extraction mix (Mix I) AOAC standard 2007.1 uses an acetate extraction mix (Mix II) A non-buffered extraction mix is used in the original method (Mix XII)