Jednoczesne oznaczanie wielu pozostałości pestycydów w piwie jest złożonym i trudnym procesem analitycznym. Skomplikowana matryca wymaga indywidulanego podejścia badawczego. Kluczowym etapem niniejszej pracy było usunięcie substancji przeszkadzających poprzez dobór pojedynczych sorbentów lub ich mieszanin umożliwiających redukcję efektu matrycy (ME) przy jednoczesnym uzyskaniu akceptowalnych odzysków dla każdego analitu. Do badań wytypowano dwie matryce: piwo jasne i ciemne oraz 490 substancji czynnych środków ochrony roślin (ś.o.r.). Oznaczenia instrumentalne przeprowadzono techniką GC-MS/MS i LC-MS/MS. Najskuteczniejszym sposobem oczyszczania próbki było użycie PSA/MgSO4 jako sorbentu. Średnie odzyski mieściły się w akceptowalnym zakresie 71,5−114,2% (RSD > 17%). Ponad 80% analitów charakteryzowała się nieistotnymi wartościami efektu matrycy (-20% < ME < 20%). Pozostałości ś.o.r. wykryto w dwóch próbkach z 10 przebadanych, w których potwierdzono obecność fungicydów takich jak boskalid, dimetomorf oraz tiofanat metylu.

Simultaneous determination of multi pesticide residues in beer is a complex and difficult analytical process. A complex matrix requires an individual research approach. The key stage of this work was the removal of interfering substances by selecting individual sorbents or their mixtures enabling the matrix effect (ME) reduction while obtaining acceptable recoveries for each analyte. Two matrices were selected for the research: light and dark beer and 490 active substances of plant protection products (PPPs). Instrumental determinations were carried out using GC-MS/MS and LC-MS/MS technology. The most effective way to purify the sample was to use PSA/MgSO4 as a sorbent. The mean recoveries were within the acceptable range of 71.5−114.2% (RSD > 17%). More than 80% of the analytes had insignificant matrix effect values (–20% < ME < 20%). Residues of PPPs were detected in two samples out of 10 tested, in which the presence of fungicides was confirmed, such as boscalid, dimethomorph and thiophanate-methyl.

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