Structural features of the sulphated polysaccharide from a green seaweed, Spongomorpha indica
1991
Venkata Rao, E. | Prasada Rao, N.V.S.A.V. | Sri Ramana, K.
A sulphated heteropolysaccharide, [alpha]D + 59 degrees, was isolated from a green seaweed, Spongomorpha indica, by extraction with ammonium oxalate. The polymer is composed of arabinose, xylose, galactose and glucose in the ratio 8.9:1.0:12.0:1.0. Studies showed that the polysaccharide is a complex and multilinked polymer containing arabinose in both furanose and pyranose forms. The core of the polysaccharide is composed of 1,4-linked galactose units. The arabinofuranose units are present as non-reducing end units, as well as joined through 1,3- and 1,2-linkages. The majority of the arabinopyranose units are joined through 1,4-linkages. Xylose is present as a branch terminating unit. Glucose is joined through 1,4-linkages. Both arabinose and galactose carry branches. Sulphate groups are present on some of the arabinose units at C-2 and on some of the galactose units at C-2 and C-3.
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