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|Authors:||Siddhanta, A. K.|
Goswami, A. M.
Mody, K. H.
Ramavat, B. K.
Mairh, O. P.
|Keywords:||Laurencia;Rhodomelaceae;Rhodophyta;sulphated galactans;sulphated polysaccharides|
|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 6¢-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.|
|Appears in Collections:||IJMS Vol.31(4) [December 2002]|
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