Coexistence of Agaroid and Carrageenan Structures in a Polysaccharide from the Red Seaweed Rhodomela larix (Turner) C. Ag.
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R. Takano
Abstract
A mixture of water-soluble sulfated polysaccharides from the red seaweed Rhodomela larix (Turner) C. Ag. was fractionated into two fractions, PS1 and PS2, in terms of differences in solubility of their cetylpyridinium salts in potassium chloride solution. The main fraction, PS2, consisted of D-galactose (Gal), 3,6-anhydro-L-galactose (L-AnGal), 2-O-methyl-L-AnGal, sulfate and small amounts of L-Gal, 2-O-methyl-L-Gal and D-xylose. Analysis of the methanol-soluble partial methanolysis product from PS2 led to identification of disaccharide derivatives arising from agaroid-type repeating units, [→3)β-D-Gal(1→4)L-AnGal(1→] and [→3)β-D-Gal(1→4)2-O-methyl-L-AnGal(1→]. Furthermore, occurrence of both agaroid- and carrageenan-type repeats, [→3)β-D-Gal(1→4)α-L-Gal(1→] and [→3)β-D-Gal(1→4)α-D-Gal(1→], was discovered by analyses of the methanol-insoluble material remaining after the partial methanolysis. Sulfate groups in PS2 appeared to be located at O-6 of the (1→4)-linked L- and 2-O-methyl-L-Gal residues, O-6 of the (1→3)-linked D-Gal residue, O-2 of the (1→4)-linked L-AnGal residue and O-3 of (1→4)-linked D-Gal residue.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Comparison of the Phytoplankton Assemblages of the South-Eastern Barents Sea and South-Western Kara Sea: Phytogeographical Status of the Regions
- Intertidal Fungi in Mangalore Harbour, Southern India
- Epiphyte Accrual on Posidonia oceanica (L.) Delile Leaves: Implications for Light Absorption
- The Benthic Marine Algae of Uruguay
- On the Evolution of Interactions between Marine Mesoherbivores and Algae
- Bioaccumulation of Hg, Cd, Pb and Zn in Four Marine Phanerogams and the Alga Caulerpa prolifera (Försskal) Lamouroux from the East Coast of Spain
- Differential Antibacterial Activity of Extracts from Selected Southern African Macroalgal Thalli
- Seasonal Variations in the Yield, Gelling Properties, and Chemical Composition of Agars from Gracilaria eucheumoides and Gelidiella acerosa (Rhodophyta) from the Philippines
- Coexistence of Agaroid and Carrageenan Structures in a Polysaccharide from the Red Seaweed Rhodomela larix (Turner) C. Ag.
- Life History of a Marine Dinoflagellate Pyrophacus steinii (Schiller) Wall et Dale
- Halogenated Secondary Metabolites of Laurencia similis (Rhodomelaceae, Rhodophyta)
