A new method for determination of fumonisins in corn samples was developed and validated. The mycotoxins were extracted by a mixture of methanol-acetonitrile-water (1:1:2, v/v/v) and determined on a liquid chromatograph with mass spectrometric detection. The separation was performed on Zorbax XDB-C(18) column (150 x 4.6 mm; 5 microm) with a Metaguard ODS-2 precolumn (30 x 4.6 mm; 5 mum) using gradient elution with mobile phase consisting of acetonitrile and 5 mmol/L ammonium acetate (adjusted by acetic acid to pH 3.0). For detection of (M+H(+)) ions, a quadrupole mass spectrometer in single ion monitoring mode was applied. Developed method showed very good linearity in a tested range of concentration. Detection limit is 62.0 microg FB(1)/kg and 58.5 microg FB(2)/kg of maize grains. Because the detection limits lie under the maximum permitted EU levels, the method is suitable for determination of fumonisins in milled corn grains.

Department of Food Technology Faculty of Agronomy Mendel University of Agriculture and Forestry in Brno Brno Czech Republic

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