Plant products may incorporate, at the same time, several mycotoxins, for instance, aflatoxins, kojic acid and zearalenone or ochratoxins and citrinin or other combinations of mycotoxins. Their presence is stipulated by a whole number of reasons, most important of which are the following: • Mechanical mixing of the lots of grain and seeds, polluted with different mycotoxins; • Possible infection of products with fungi strains, capable of simultaneous production of several mycotoxins • Development of mycotoxins with the parallel or consecutive development of different fungi-producents of mycotoxins on products.