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New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 3. The Structure of the Polysaccharide from Cladhymenia oblongifolia

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Published/Copyright: June 1, 2005
Botanica Marina
From the journal Volume 43 Issue 3

Abstract

The polysaccharide from Cladhymenia oblongifolia and some of its derivatives have been examined by 13C nuclear magnetic resonance spectroscopy and the spectra analysed with the techniques of set theory. The polysaccharide is an agaroid with significant levels of sulfation at most positions other than the axial hydroxyl group. The 4-linked units consist of anhydrogalactosyl and galactosyl units in the approximate ratio of 3:2. The galactose, but not the anhydrogalactose, units in the natural polymer have high levels of 2-sulfate ester, while low levels of galactose-3-sulfate are also present in the galactosyl residues. The 4-linked galactosyl units also contain significant levels of 6-sulfate, which is converted to anhydrogalactose by alkali treatment, including significant levels of anhydrogalactose-2-sulfate. The 3-linked units consist of high levels of galactose 2-sulfate, moderate levels of galactose 6-sulfate, and very low levels of pyruvate acetal. Methylation is largely absent from this polysaccharide. The approximate structure can be summarized in set theory nomenclature as 3DG∣2S0.4(4,6)P0.05 6S0.4∣ – 4L{AG0.6, G0.4∣2S0.353S0.16S0.3∣}. The polysaccharide is similar to those extracted from other members of the Rhodomelaceae to the extent that it is a non-gelling agaroid, but the high levels of 2-sulfation are unusual as is the total variation in sulfation.

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Published Online: 2005-06-01
Published in Print: 2000-05-10

Copyright (c)2000 by Walter de Gruyter GmbH & Co. KG

Articles in the same Issue

  1. Effect of Temperature and Irradiance on the Release, Attachment and Survival of Spores of Gracilaria pacifica Abbott (Rhodophyta)
  2. Ultrastructure of Asci and Ascospore Appendages in Linocarpon appendiculatum and L. nipae
  3. Mass Development of Marine Benthic Sarcinochrysidales (Chrysophyceae s.l.) in Corsica
  4. Multiple Antimicrobial Activities of the Marine Alga Spyridia filamentosa (Ceramiaceae, Rhodophyta)
  5. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 1. The Effect of Substitution on the Chemical Shifts of Simple Diad Galactans
  6. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 2. Galactans Consisting of Mixed Diads
  7. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 3. The Structure of the Polysaccharide from Cladhymenia oblongifolia
  8. Restoration Techniques for Macrocystis pyrifera (Phaeophyceae) Populations at the Southern Limit of Their Distribution in México
  9. Manipulation of Galactan Biosynthesis in Gracilaria chilensis Bird, McLachlan et Oliveira by Light Deprivation
  10. A Detailed Morphological Study of the Type Species of Osmundea (Rhodomelaceae, Rhodophyta)
  11. Phenology of Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta, Gigartinales) in Three Populations from Rio de Janeiro State, Brazil
https://doi.org/10.1515/BOT.2000.028

Articles in the same Issue

  1. Effect of Temperature and Irradiance on the Release, Attachment and Survival of Spores of Gracilaria pacifica Abbott (Rhodophyta)
  2. Ultrastructure of Asci and Ascospore Appendages in Linocarpon appendiculatum and L. nipae
  3. Mass Development of Marine Benthic Sarcinochrysidales (Chrysophyceae s.l.) in Corsica
  4. Multiple Antimicrobial Activities of the Marine Alga Spyridia filamentosa (Ceramiaceae, Rhodophyta)
  5. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 1. The Effect of Substitution on the Chemical Shifts of Simple Diad Galactans
  6. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 2. Galactans Consisting of Mixed Diads
  7. New 13C NMR Methods for Determining the Structure of Algal Polysaccharides. Part 3. The Structure of the Polysaccharide from Cladhymenia oblongifolia
  8. Restoration Techniques for Macrocystis pyrifera (Phaeophyceae) Populations at the Southern Limit of Their Distribution in México
  9. Manipulation of Galactan Biosynthesis in Gracilaria chilensis Bird, McLachlan et Oliveira by Light Deprivation
  10. A Detailed Morphological Study of the Type Species of Osmundea (Rhodomelaceae, Rhodophyta)
  11. Phenology of Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta, Gigartinales) in Three Populations from Rio de Janeiro State, Brazil
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