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Botanica Marina

Editor-in-Chief: Dring, Matthew J.

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1437-4323
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Volume 46, Issue 2

Issues

Occurrence of Carrageenan Structure in an Agar from the Red Seaweed Digenea simplex (Wulfen) C. Agardh (Rhodomelaceae, Ceramiales) with a Short Review of Carrageenan-Agarocolloid Hybrid in the Florideophycidae

R. Takano / K. Shiomoto / K. Kamei / S. Hara / S. Hirase
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BOT.2003.015

Abstract

A fractionation study of crude agar from the red seaweed Digenea simplex led to isolation of a galactan sulfate fraction consisting of a carrageenan-agaroid hybrid-type backbone. This polysaccharide fraction, containing D-galactose (Gal), L-Gal, 3,6-anhydro-D-galactose (D-AnGal), L-AnGal, sulfate and a small amount of xylose, appeared to consist of repeating units of both 4-O-β-D-galactopyranosyl-3,6-anhydro-L-galactose (agarobiose) and 4-O-β-D-galactopyranosyl-3,6-anhydro-D-galactose (carrabiose) on the basis of results from a partial methanolysis study. Two other repeating disaccharide units in the backbone, 4-O-β-D-galactopyranosyl- L-galactose and 4-O-β-D-galactopyranosyl-D-galactose, were also suggested by the methylation study. The sulfate groups were also suggested to be located at O-4 of (1→3)-linked D-Gal, O-6 of (1→3)-linked D-Gal, O-6 of (1→4)-linked L-Gal and/or O-2 of (1→4)-linked AnGal residues, besides O-3 of (1→4)-linked D-Gal residue. Co-occurrence of carrageenan and agarocolloid backbone structure among the genera in the Florideophycidae was also reviewed.

About the article

Published Online: 2005-06-01

Published in Print: 2003-03-10


Citation Information: Botanica Marina, Volume 46, Issue 2, Pages 142–150, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/BOT.2003.015.

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