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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 5 | PAGES 907-917 | 1995
© Oxford University Press

research-article

Natural occurrence of phycoerythrocyanin-like pigment in cyanobacterial blooming samples dominated by Microcystis in Lake Kasumigaura

Shinya Hashimoto and Akira Otsuki

Department of Marine Science and Technology, Tokyo University of Fisheries 4-5-7 Konan, Minato-ku, Tokyo 108, Japan

We describe the occurrence of phycocyanin and phycoerythrocyanin-like pigment in natural Microcystis colonies collected in Lake Kasumigaura. For differentiating pigments, the combination of simultaneous determination of molecular weights of {alpha} and ß and subunits by electrospray ionization mass spectrometry with HPLC separation and fluorescence measurements was used. It was suggested that the natural Microcystis colonies may contain the phycoerythrocyanin-like pigment, judged from the excitation and emission spectra. Measured pigments consisted of different molecular weights of {alpha} and ß subunits, but the molecular weights of {alpha} and ß subunits in both phycocyanin and phycoerythrocyanin-like pigments were not always identical.


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