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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 10 | PAGES 1951-1958 | 1995
© Oxford University Press

research-article

Differentiation of phycocyanins of Microcystis aeruginosa in two different eutrophic lakes using electrospray ionization mass spectrometry

Shinya Hishimoto, Teru Ioriya1 and Akira Otsuki

Department of Marine Science & Technology, Tokyo University of Fisheries 4-5-7 Konan, Minato-ku, Tokyo 108, Japan 1Department of Aquatic Biosciences, Tokyo University of Fisheries 4-5-7 Konan, Minato-ku, Tokyo 108, Japan

Received on March 9, 1995; accepted on June 22, 1995 Phycocyanins were extracted from natural Microcystis aeruginosa colonies. Electrospray ionization mass spectrometry (ESI-MS) was used to investigate the molecular weights of {alpha} and ß subunits of phycocyanins. ESI-MS measurements showed that the molecular weights of phycocyanins extracted from Microcystis aeruginosa f. aeruginosa collected at two different eutrophic lakes were not identical. This result suggested that the molecular weights of phycocyanins may not always be identical among the same species of natural cyanobacteria and one may be able to characterize the cyanobacteria by a chemical taxonomic method through the determination of phycocyanin molecular weights. Molecular weight determination of phycocyanins by ESI-MS may have great potential to classify the species of cyanobacteria.


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