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Abstract The fucan sulfate extracted from Ecklonia after it had been stored at --20 °C for 3 years differed from that extracted from fresh material. The anticoagulant activity of the extract from the stored material was only half that of a similar extract from fresh material. Introduction In a previous study, a potent anticoagulant fucan sulfate (C-II), which consisted of fucose (Fuc), galactose (Gal), glucuronic acid (GlcA) and sulfate in the molar ratio of 1.00:0.19:0.07:1.48 and had an average molecular weight of 21 000, was purified in 1986 from the brown seaweed Ecklonia kurome Okamura collected in the Japan sea in 1985 (Nishino et al. 1989). In 1988, for further study, we attempted to isolate fucan sulfate from the same seaweed fronds which had been stored at --20 °C until use. However, the fucan sulfate (C-II-88) obtained from the stored seaweed fronds differed very much from the fucan sulfate (C-II) isolated in 1986 with regard to the components and the anticoagulant activity, though both fucan sulfates were prepared from the same source. This fact suggests that the chemical and biological properties of the fuean sulfate may have changed during the period of storage of the seaweed fronds in
Botanica Marina – de Gruyter
Published: Jan 1, 1991
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