Chemical Characterization of Fucoidan from Commercially Cultured Nemacystus decipiens (Itomozuku)

概要

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Fucoidan was isolated from Nemacystus decipiens KUCKUCK which is commercially cultured at the rate of about 2,000 t/year in fields of the Okinawa Islands, in Japan. The yield of fucoidan extracted by 0.1 M HCl was 0.5% (W/W) based on the wet algae. The total carbohydrate, sulfuric acid, ash, and moisture in fucoidan was 65.8,30.8,22.3,and 3.8%, respectively. Fucose and galactose were identified by liquid chromatography. The molar ratio of the sugar residues in the fucoidan was estimated to be L-fucose : D-galactose : sulfuric acid=1.0 : 0.05 : 1.0. The optical rotation of the fucoidan (0.4%) showed a value of -0.315°at 60℃, then it decreased a little with decreasing temperature. The infrared spectrum of isolated fucoidan is in agreement with that of standard fucoidan. The molecular mass of fucoidan was estimated to be 2.4×10^5. The ^1H-and ^13C-NMR spectral data suggest that fucoidan is mainly composed of L-fucopyranose, 2-mono-O-sulfo-L-fucopyranose, 4-mono-O-sulfo-L-fucopyranose, and 2,4-di-O-sulfo-L-fucopyranose.
社団法人日本農芸化学会の論文
1999-10-23