caa a22 4500 378859870 CHVBK 20180305123344.0 cr unu---uuuuu 161128e20030310xx s 000 0 eng 10.1515/BOT.2003.015 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2003.015 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 Hybridin the Florideophycidae [Elektronische Daten] [R. Takano, K. Shiomoto, K. Kamei, S. Hara, S. Hirase] 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. Copyright © 2003 by Walter de Gruyter GmbH & Co. KG Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Takano R. aut Shiomoto K. aut Kamei K. aut Hara S. aut Hirase S. aut Botanica Marina Walter de Gruyter 46/2(2003-03-10), 142-150 0006-8055 46:2<142 2003 46 botm https://doi.org/10.1515/BOT.2003.015 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2003.015 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takano R. aut NATIONALLICENCE 700 1- Shiomoto K. aut NATIONALLICENCE 700 1- Kamei K. aut NATIONALLICENCE 700 1- Hara S. aut NATIONALLICENCE 700 1- Hirase S. aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 46/2(2003-03-10), 142-150 0006-8055 46:2<142 2003 46 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter