title: Structural studies of a polysaccharide isolated from the green seaweed Chaetomorpha anteninna.
abstract: Extraction of the green seaweed Chaetomorpha anteninna with water, followed by fractionation using the copper complex, gave a sulphated heteropolysaccharide, [alpha]D27 +84 degrees, that contained arabinose (57.7%), galactose (38.5%), rhamnose (3.8%), and sulphate (11.9%). Application of methylation analysis, periodate oxidation, and partial acid hydrolysis indicated a branched structure with 4-linked arabinose, 4- and 3-linked galactose, and 4-linked rhamnose residues. Both the arabinose and galactose residues carried branches. Desulphation and analysis of the polymeric product showed that sulphate groups were located at C-2 of some of the interior arabinose residues, C-4 of some of the non-reducing-end arabisoyl groups, and C-3 of the non-reducing-end galactosyl groups.
authors.affiliation: Department of Pharmaceutical Sciences, Andhra University, Visakhapatnam, India.
authors.forename: E V
authors.initials: EV
authors.lastname: Rao
authors.forename: K S
authors.initials: KS
authors.lastname: Ramana
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D000460:Chlorophyta / Q000737:chemistry*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D011134:Polysaccharides / Q000737:chemistry*
chemical_list: D011134:Polysaccharides