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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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v84_n3_p944_Navarro http://hdl.handle.net/20.500.12110/paper_01448617_v84_n3_p944_Navarro |
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paper:paper_01448617_v84_n3_p944_Navarro2023-06-08T15:12:14Z Xylogalactans from Lithothamnion heterocladum, a crustose member of the Corallinales (Rhodophyta) Navarro, Diego Alberto Ricci, Alejandra Marcela Rodriguez, María Cecilia Stortz, Carlos Arturo 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v84_n3_p944_Navarro 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, Diego Alberto Ricci, Alejandra Marcela Rodriguez, María Cecilia Stortz, Carlos Arturo 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. |
author |
Navarro, Diego Alberto Ricci, Alejandra Marcela Rodriguez, María Cecilia Stortz, Carlos Arturo |
author_facet |
Navarro, Diego Alberto Ricci, Alejandra Marcela Rodriguez, María Cecilia Stortz, Carlos Arturo |
author_sort |
Navarro, Diego Alberto |
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) |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v84_n3_p944_Navarro http://hdl.handle.net/20.500.12110/paper_01448617_v84_n3_p944_Navarro |
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_version_ |
1768546062529724416 |