Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)

The main polysaccharides from the red seaweed Lithothamnion heterocladum share the general characteristics of corallinans (agar-like xylogalactans), even though this seaweed is crustose, whereas those previously studied in detail were articulated seaweeds. After fractionation by cetrimide precipitat...

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Autores principales: Navarro, D.A., Ricci, A.M., Rodríguez, M.C., Stortz, C.A.
Formato: JOUR
Materias:
2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
Alkylation
Methylation
Molecular weight
Polysaccharides
Seaweed
Sugars
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01448617_v84_n3_p944_Navarro
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01448617_v84_n3_p944_Navarro2023-10-03T14:59:49Z Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta) Navarro, D.A. Ricci, A.M. Rodríguez, M.C. Stortz, C.A. 2,3-Di-O- methylgalactose Agaran Corallinales Lithothamnion Rhodophyta Xylogalactans 2,3-Di-O- methylgalactose Agaran Corallinales Lithothamnion Rhodophyta Xylogalactans Alkylation Methylation Molecular weight Polysaccharides Seaweed Sugars Corallinales Lithothamnion Rhodophyta The main polysaccharides from the red seaweed Lithothamnion heterocladum share the general characteristics of corallinans (agar-like xylogalactans), even though this seaweed is crustose, whereas those previously studied in detail were articulated seaweeds. After fractionation by cetrimide precipitation, several fractions were separated and characterized by sugar composition, other components, methylation, ethylation, desulfation-methylation, and NMR analyses. The main group of fractions carry the agaran disaccharidic repeating unit [→3)-β-d-Galp-(1 → 4)-α-l-Gal-(1→] substituted mainly on O-6 of the β-d-Gal unit by β-xylosyl side stubs, and less with sulfate or methoxyl groups, and also on O-2 of the α-l-Gal unit with methoxyl or sulfate, or less on O-3 of the same unit with methoxyl groups. These features are common to those of the polysaccharides of the four members of the order Corallinales already studied. However, a sugar not very common to the order appears in substantial proportions: 2,3-di-O-methyl-d-galactose, which acts as a side stub. Another peculiar issue is the presence of significant amounts of 4-linked α-l-Gal units glycosylated on O-6 or O-3. These results confirm that within a common pattern of corallinean xylogalactans, each species has minor characteristics of their own. © 2010 Elsevier Ltd. All rights reserved. Fil:Navarro, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ricci, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Stortz, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01448617_v84_n3_p944_Navarro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
Alkylation
Methylation
Molecular weight
Polysaccharides
Seaweed
Sugars
Corallinales
Lithothamnion
Rhodophyta
spellingShingle 2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
Alkylation
Methylation
Molecular weight
Polysaccharides
Seaweed
Sugars
Corallinales
Lithothamnion
Rhodophyta
Navarro, D.A.
Ricci, A.M.
Rodríguez, M.C.
Stortz, C.A.
Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
topic_facet 2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
2,3-Di-O- methylgalactose
Agaran
Corallinales
Lithothamnion
Rhodophyta
Xylogalactans
Alkylation
Methylation
Molecular weight
Polysaccharides
Seaweed
Sugars
Corallinales
Lithothamnion
Rhodophyta
description The main polysaccharides from the red seaweed Lithothamnion heterocladum share the general characteristics of corallinans (agar-like xylogalactans), even though this seaweed is crustose, whereas those previously studied in detail were articulated seaweeds. After fractionation by cetrimide precipitation, several fractions were separated and characterized by sugar composition, other components, methylation, ethylation, desulfation-methylation, and NMR analyses. The main group of fractions carry the agaran disaccharidic repeating unit [→3)-β-d-Galp-(1 → 4)-α-l-Gal-(1→] substituted mainly on O-6 of the β-d-Gal unit by β-xylosyl side stubs, and less with sulfate or methoxyl groups, and also on O-2 of the α-l-Gal unit with methoxyl or sulfate, or less on O-3 of the same unit with methoxyl groups. These features are common to those of the polysaccharides of the four members of the order Corallinales already studied. However, a sugar not very common to the order appears in substantial proportions: 2,3-di-O-methyl-d-galactose, which acts as a side stub. Another peculiar issue is the presence of significant amounts of 4-linked α-l-Gal units glycosylated on O-6 or O-3. These results confirm that within a common pattern of corallinean xylogalactans, each species has minor characteristics of their own. © 2010 Elsevier Ltd. All rights reserved.
format JOUR
author Navarro, D.A.
Ricci, A.M.
Rodríguez, M.C.
Stortz, C.A.
author_facet Navarro, D.A.
Ricci, A.M.
Rodríguez, M.C.
Stortz, C.A.
author_sort Navarro, D.A.
title Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
title_short Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
title_full Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
title_fullStr Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
title_full_unstemmed Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta)
title_sort xylogalactans from lithothamnion heterocladum, a crustose member of the corallinales (rhodophyta)
url http://hdl.handle.net/20.500.12110/paper_01448617_v84_n3_p944_Navarro
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AT ricciam xylogalactansfromlithothamnionheterocladumacrustosememberofthecorallinalesrhodophyta
AT rodriguezmc xylogalactansfromlithothamnionheterocladumacrustosememberofthecorallinalesrhodophyta
AT stortzca xylogalactansfromlithothamnionheterocladumacrustosememberofthecorallinalesrhodophyta
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