Seven microcystins from Microcystis waterbloom in Lake Dalai, China

Abstract

Seven types of microcystins, isolated from Microcystis waterbloom in Lake Dalai, were characterized. The major toxins: MCYST-LR, MCYST-RR, (D-Asp-3) MCYST-LR and (Dha-7) MCYST-LR were identified by high performance liquid chromatography (HPLC), as compared with the authentic microcystins. The minor toxins: MCYST FR, CL-Mser-7) MCYST-LR and an unknown MCYST which was most likely to be MCYST-(H-4) YR were identified with fritfast atom bombardment liquid chromatography/mass spectrometry (Frit-FAB LC/MS) and amino acid analysis. The toxigenic diversity in blue-green algae (cyanobacteria) was discussed