Assessment of Matrix Effect in Quantitative Milk Analysis for Pyrethroids Based on GC-MS/MS

Resumo

In chromatographic analysis of complex samples, the chromatographic responses attributed to pesticides may undergo changes caused by matrix components. These variations can be due by the phenomenon named matrix effect. Cyfluthrin (CYF), cypermethrin (CYP), deltamethrin (DEL), and permethrin (PER) were extracted from raw milk and analysis carried out using a Gas Chromatography coupled to mass spectrometry (GC-MS/MS) technique. The aim of the present work was to investigate the variations of chromatographic response when milk samples are diluted with different solvents (acetone, acetonitrile or hexane) in final dilution immediately after the extraction. Results showed differences between solvents (p<0.05) and acetonitrile showed more appropriate results for all pyrethroids.