title: Structural characterization of a heteropolysaccharide isolated from hot water extract of the stems of Amaranthus tricolor Linn. (Amaranthus gangeticus L.).
abstract: A water-soluble polysaccharide (PS-I), isolated from the aqueous extract of the stems of Amaranthus tricolor Linn. (Amaranthus gangeticus L.), was found to consist of L-arabinose, methyl-D-galacturonate, D-galactose, and 3-O-Ac-L-rhamnose in a molar ratio of nearly 1:1:1:1. On the basis of total acid hydrolysis, methylation analysis, periodate oxidation, and NMR studies ((1)H, (13)C, TOCSY, DQF-COSY, NOESY, ROESY, HMQC, and HMBC), the structure of the repeating unit of the PS-I is determined as: -->5)-alpha-L-Araf-(1-->4)-beta-D-Galp-(1-->2)-3-O-Ac-beta-L-Rhap-(1-->4)-alpha-D-Gal-A6Me-(1-->
authors.affiliation: Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore 721 102, West Bengal, India.
authors.forename: Ramsankar
authors.initials: R
authors.lastname: Sarkar
authors.forename: Chanchal K
authors.initials: CK
authors.lastname: Nandan
authors.forename: Soumitra
authors.initials: S
authors.lastname: Mandal
authors.forename: Pradip
authors.initials: P
authors.lastname: Patra
authors.forename: Debsankar
authors.initials: D
authors.lastname: Das
authors.forename: Syed S
authors.initials: SS
authors.lastname: Islam
mesh_terms: D027721:Amaranthus / Q000737:chemistry*; D002240:Carbohydrate Sequence; D006358:Hot Temperature; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D014867:Water
chemical_list: D010936:Plant Extracts; D011134:Polysaccharides; D014867:Water