EN
HP-HPLC (reversed-phase high-performance liquid chromatography) was used to analyse chlorophyll and carotenoid pigments in cyanobacteria and algae from the Baltic Sea, belonging to different taxonomic groups. The following species were used: Cyclotella meneghiniana - diatom, Oocystis submarina - green alga and Phormidium amphibium - cyanobacterium. Investigations on a favourable method of chlorophyll and carotenoid pigment separation have been carried out. This method allowed to separate the following pigments: lutein and zeaxanthin; diadinoxanthin and fucoxanthin; chlorophyll c1 and c2, into sharp peaks. It could be presumed that the method would be useful and universal in the identification of pigments in other algal and cyanobacteria species and natural phytoplankton assemblages.