On-line SPE-HPLC method development for determination of zearalenone in beers

Charles University in Prague Faculty of Pharmacy in Hradec Králové Department of Analytical Chemistry Candidate: Bc. Barbora Gajdošová Supervisor: Doc. RNDr. Dalibor Šatínský, Ph.D. Title of Diploma Thesis: On-line SPE-HPLC method development for determination of zearalenone in beers High performance liquid chromatography coupled with on-line solid phase extraction (SPE) using the column switching technique for sample preparation was utilized for the development of the method for the determination of mycotoxin zearalenone in beer. Two different SPE sorbents were tested. A volume of 50 µl of beer sample was injected directly into the chromatographic system. After injection, the sample extraction of zearalenone from the matrix was carried out on SPE precolumn Ascentis® Express C18 Guard Cartridge (5 x 4.6 mm, 5 µm), which is based on the reverse phase, or on SPE precolumn (10 x 4.6 mm) filled with Affinimip® SPE Zearalenone sorbent, a specific Moleculary Imprinted Polymer, designed for the selective extraction of zearalenone. 40% methanol - 2% water solution of acetic acid was selected as the washing solution for removing ballast matrix for the C18 extraction column and 10% acetonitrile - 2% water solution of acetic acid for the Affinimip column. These washing solutions were flowed through the..