The Structures of the Polysaccharides from Two Lophurella Species as Determined by 13C NMR Spectroscopy
-
I. J. Miller
Abstract
The polysaccharide extracts from Lophurella hookeriana and Lophurella caespitosa together with some derivatives have been examined by 13C nuclear magnetic resonance spectroscopy and the spectra analysed with the techniques of set theory. The polysaccharides are agaroids that consist of 3-linked D-galactose and 4-linked L-galactose or anhydro-L-galactose. The polysaccharides from both algae were partially sulfated at the 2- and 6-positions of both the 3- and 4-linked units. The polysaccharide from Lophurella hookeriana comprised at least 90% anhydrogalactosyl precursor diads, and was otherwise between 65–75% unsubstituted, with approximately 22% of the 4-linked units being 2-sulfated, 12% of the 3-linked units being 2-sulfated, and 15% of the 3-linked units being 6-sulfated. The polysaccharide from Lophurella caespitosa contained approximately 15% anhydrogalactosyl precursors, 40% L-galactose that was not convertible to anhydrogalactose, and no more than 25% unsubstituted agarose diads following alkali treatment. Approximately 55% of the 4-linked units were 2-sulfated, 28% of the 3-linked units were 2-sulfated, and 25% of the 3-linked units were 6-sulfated.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Comparative Sensitivity of Seven Marine Microalgae to Cumulative Exposure to Ultraviolet-B Radiation with Daily Increasing Doses
- Microspatial Variability Inside Epilithic Algal Communities within Territories of the Damselfish Stegastes nigricans at La Réunion (Indian Ocean)
- Ultrastructure and Taxonomy of Sporocladopsis novae-zelandiae (Ulvophyceae, Chlorophyta)
- An Agaroid-Carrageenan Hybrid Type Backbone Structure for the Antithrombotic Sulfated Polysaccharide from Grateloupia indica Boergensen (Halymeniales, Rhodophyta)
- Chemical Composition of the Brown Alga Padina pavonia (L.) Gaill. from the Adriatic Sea
- Spatial and Seasonal Distribution of Seaweeds on Coral Reefs from Southern Bahia, Brazil
- Effects of Salinity on Growth and Toxin Production of a Noxious Phytoflagellate, Heterosigma akashiwo (Raphidophyceae)
- Monthly Monitoring of Domoic Acid Producer Pseudo-nitzschia multiseries (Hasle) Hasle Using Species-Specific DNA Probes and WGA Lectins and Abundance of Pseudo-nitzschia Species (Bacillariophyceae) from Chinhae Bay, Korea
- The Structures of the Polysaccharides from Two Lophurella Species as Determined by 13C NMR Spectroscopy
- Notes on Marine Algae Collected in Guinea-Bissau, Tropical West Africa
- Predaea goffiana sp. nov., (Nemastomataceae, Rhodophyta) from Puerto Rico, Caribbean Sea
- Meetings
Articles in the same Issue
- Comparative Sensitivity of Seven Marine Microalgae to Cumulative Exposure to Ultraviolet-B Radiation with Daily Increasing Doses
- Microspatial Variability Inside Epilithic Algal Communities within Territories of the Damselfish Stegastes nigricans at La Réunion (Indian Ocean)
- Ultrastructure and Taxonomy of Sporocladopsis novae-zelandiae (Ulvophyceae, Chlorophyta)
- An Agaroid-Carrageenan Hybrid Type Backbone Structure for the Antithrombotic Sulfated Polysaccharide from Grateloupia indica Boergensen (Halymeniales, Rhodophyta)
- Chemical Composition of the Brown Alga Padina pavonia (L.) Gaill. from the Adriatic Sea
- Spatial and Seasonal Distribution of Seaweeds on Coral Reefs from Southern Bahia, Brazil
- Effects of Salinity on Growth and Toxin Production of a Noxious Phytoflagellate, Heterosigma akashiwo (Raphidophyceae)
- Monthly Monitoring of Domoic Acid Producer Pseudo-nitzschia multiseries (Hasle) Hasle Using Species-Specific DNA Probes and WGA Lectins and Abundance of Pseudo-nitzschia Species (Bacillariophyceae) from Chinhae Bay, Korea
- The Structures of the Polysaccharides from Two Lophurella Species as Determined by 13C NMR Spectroscopy
- Notes on Marine Algae Collected in Guinea-Bissau, Tropical West Africa
- Predaea goffiana sp. nov., (Nemastomataceae, Rhodophyta) from Puerto Rico, Caribbean Sea
- Meetings
