Sulphated xylogalactans from Nothogenia fastigiata

MARÍA C. MATULEWICZ; HERNÁN H. HAINES; ALBERTO S. CEREZO

PHYTOCHEMISTRY

Pergamon, Elsevier Science Ltd.

Lugar: Oxford, Gran Bretaña; Año: 1994 vol. 36 p. 97 - 103

0031-9422

Fractionation of the Cetrimide salt of the sulphated polysaccharides of Nothogenia fastigiata led to the isolation of a complex product constituted by a xylogalactan sulphate and a xylomannan sulphate. Its structural study by methylation and desulphation-methylation analyses and 13C NMR spectroscopy indicated for the xylogalactan sulphate a backbone formed by 4-linked alpha- L-galactopyranose and 3-linked beta-D-galactopyranose. The alpha-L-galactopyranosyl units are either 6-sulphated having single stubs of (1,3)-linked xylose or galactose, 3-sulphated or non-substituted. The beta-D-galactopyranosyl residues are non-substituted or 4-sulphated. The xylomannan sulphate is similar to that previously isolated from this seaweed.