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Structural Characterization of an Acidic Heteropolysaccharide from Rudbeckia fulgida, var. sullivantii (Boynton et Beadle)

P. Capek and A. Kardošová

Institute of Chemistry, Slovak Academy of Sciences, SK-842 38 Bratislava

 

E-mail: chemcape@savba.sk

Abstract: An acidic heteropolysaccharide composed of L-rhamnose (14.0 %), L-arabinose (17.7 %), D-xylose (3.0 %), D-mannose (2.6 %), D-glucose (5.4 %), D-galactose (38.4 %), and uronic acids (18.9 %) has been isolated from the aerial part of the medicinal plant Rudbeckia fulgida, var. sullivantii. Compositional and methylation analyses of the native and carboxyl-reduced polymers, 13C NMR spectroscopy measurements as well as the products of partial acid hydrolysis pointed to a branched structure of the polymer with a backbone formed by 3- and 3,6-linked galactose units carrying mainly arabinofuranose (5- and 3-linked) and ramified rhamnogalacturonan side chains. The glucuronic acid and xylose as well as some arabinose and galactose residues occupied terminal positions in the polymer.

Full paper in Portable Document Format: 555a311.pdf

 

Chemical Papers 55 (5) 311–318 (2001)

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