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Title:  Sulphated galactans of marine red alga Laurencia spp. (Rhodomelaceae, Rhodophyta) from the west coast of India
Authors: Siddhanta, A. K.
Goswami, A. M.
Shanmugam, M.
Mody, K. H.
Ramavat, B. K.
Mairh, O. P.
Keywords: Laurencia
sulphated galactans
sulphated polysaccharides
Issue Date: Dec-2002
Publisher: CSIR
Abstract: Sulphated galactans were isolated from four different species of Laurencia (L. papillosa, L. cruciata, L. pedicularioides, L. majuscula) from Indian waters. The crude sulphated polysaccharide (SPS) extracts contained ash (16-18%), moisture (14-18%), sugar (44-53%), sulphate (12-18%), protein (2-6%), 3,6-anhydrogalactose (14-27%) and uronic acid (4-9%). Crude extracts were chromatoghaphed on DEAE cellulose column and major fractions (0.5 M NaCl fraction) were characterized by GC-MS and 13C-NMR studies. Agarose-2-sulphate unit was identified in all the four polysaccharides samples. Laurencia papillosa, L. cruciata and L. pedicularioides SPS were found to be of similar type having 2-O-methy-3,6-anhydro-L-galactose and agaran 6ยข-sulphate (porphyran) units. Agarobiose and agarose-6-sulphate were detected in L. majuscula. Identification and chemical nature of these sulphated polysaccharides in the Laurencia spp. of Indian waters are of chemotaxonomic significance in view of their potential applications as agaroid.
Page(s): 305-309
ISSN: 0379-5136
Source:IJMS Vol.31(4) [December 2002]

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