The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents

The hot-water extract from Kappaphycus alvarezii is composed of 74% of κ-carrageenans, 3% of μ-carrageenans, and 14% of sulfated agarans and dl-hybrid galactans with significant amounts of single stubs. The great tendency to retain Ca 2+ and Mg 2+ was studied. The galactans extracted with hot water...

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Autores principales:	Estevez, J.M., Ciancia, M., Cerezo, A.S.
Formato:	JOUR
Materias:	Agarans Ca 2+ - polysaccharide interactions Carrageenans Kappaphycus alvarezii Red seaweed Structure determination Sulfated galactans Seaweeds Atmospheric temperature Biosynthesis Magnesium printing plates Potassium Substitution reactions Thermal effects Weed control Marine biology calcium carrageenan divalent cation galactan galactose glucose derivative magnesium sulfate article chemical interaction chemical reaction complex formation priority journal seaweed statistical significance Calcium Carrageenan Chromatography, Ion Exchange Galactans Magnesium Monosaccharides Nuclear Magnetic Resonance, Biomolecular Seaweed Sulfates algae Kappaphycus
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00086215_v339_n15_p2575_Estevez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00086215_v339_n15_p2575_Estevez2023-10-03T14:07:04Z The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents Estevez, J.M. Ciancia, M. Cerezo, A.S. Agarans Ca 2+ - polysaccharide interactions Carrageenans Kappaphycus alvarezii Red seaweed Structure determination Sulfated galactans Seaweeds Atmospheric temperature Biosynthesis Magnesium printing plates Potassium Substitution reactions Thermal effects Weed control Marine biology calcium carrageenan divalent cation galactan galactose glucose derivative magnesium sulfate article chemical interaction chemical reaction complex formation priority journal seaweed statistical significance Calcium Carrageenan Chromatography, Ion Exchange Galactans Magnesium Monosaccharides Nuclear Magnetic Resonance, Biomolecular Seaweed Sulfates algae Kappaphycus Kappaphycus alvarezii The hot-water extract from Kappaphycus alvarezii is composed of 74% of κ-carrageenans, 3% of μ-carrageenans, and 14% of sulfated agarans and dl-hybrid galactans with significant amounts of single stubs. The great tendency to retain Ca 2+ and Mg 2+ was studied. The galactans extracted with hot water from Kappaphycus alvarezii, after previous extraction at room temperature, are mainly composed of κ-carrageenans (∼74%) and μ-carrageenans (∼3%). However, a significant percentage of these galactans (at least 14%) is composed of sulfated agarans and, possibly, agaran-type sulfated dl-hybrid galactans. These agarans are partially substituted on C-2 or C-4 or disubstituted on both positions of the β-d-galactose units and on C-3 or C-2 and C-3 of the α-l-galactose residues with sulfate groups or single stubs of β-d-xylopyranose, d-glucopyranose, and galactose or with d-glucopyranosyl-(1→4)-d- glucopyranose side chains. Significant quantities of 2-O-methyl- and 3-O-methyl-l-galactose units are also present. A great tendency to retain Ca 2+ and Mg 2+, in spite of massive treatments with Na + and K + salts, was observed. The complexation between agarans and agarans - κ-carrageenans through divalent cations and the possible zipper-type carbohydrate - carbohydrate interactions would be two complementary mechanisms of interactions. © 2004 Elsevier Ltd. All rights reserved. Fil:Estevez, J.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ciancia, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerezo, A.S. 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_00086215_v339_n15_p2575_Estevez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Agarans Ca 2+ - polysaccharide interactions Carrageenans Kappaphycus alvarezii Red seaweed Structure determination Sulfated galactans Seaweeds Atmospheric temperature Biosynthesis Magnesium printing plates Potassium Substitution reactions Thermal effects Weed control Marine biology calcium carrageenan divalent cation galactan galactose glucose derivative magnesium sulfate article chemical interaction chemical reaction complex formation priority journal seaweed statistical significance Calcium Carrageenan Chromatography, Ion Exchange Galactans Magnesium Monosaccharides Nuclear Magnetic Resonance, Biomolecular Seaweed Sulfates algae Kappaphycus Kappaphycus alvarezii
spellingShingle	Agarans Ca 2+ - polysaccharide interactions Carrageenans Kappaphycus alvarezii Red seaweed Structure determination Sulfated galactans Seaweeds Atmospheric temperature Biosynthesis Magnesium printing plates Potassium Substitution reactions Thermal effects Weed control Marine biology calcium carrageenan divalent cation galactan galactose glucose derivative magnesium sulfate article chemical interaction chemical reaction complex formation priority journal seaweed statistical significance Calcium Carrageenan Chromatography, Ion Exchange Galactans Magnesium Monosaccharides Nuclear Magnetic Resonance, Biomolecular Seaweed Sulfates algae Kappaphycus Kappaphycus alvarezii Estevez, J.M. Ciancia, M. Cerezo, A.S. The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
topic_facet	Agarans Ca 2+ - polysaccharide interactions Carrageenans Kappaphycus alvarezii Red seaweed Structure determination Sulfated galactans Seaweeds Atmospheric temperature Biosynthesis Magnesium printing plates Potassium Substitution reactions Thermal effects Weed control Marine biology calcium carrageenan divalent cation galactan galactose glucose derivative magnesium sulfate article chemical interaction chemical reaction complex formation priority journal seaweed statistical significance Calcium Carrageenan Chromatography, Ion Exchange Galactans Magnesium Monosaccharides Nuclear Magnetic Resonance, Biomolecular Seaweed Sulfates algae Kappaphycus Kappaphycus alvarezii
description	The hot-water extract from Kappaphycus alvarezii is composed of 74% of κ-carrageenans, 3% of μ-carrageenans, and 14% of sulfated agarans and dl-hybrid galactans with significant amounts of single stubs. The great tendency to retain Ca 2+ and Mg 2+ was studied. The galactans extracted with hot water from Kappaphycus alvarezii, after previous extraction at room temperature, are mainly composed of κ-carrageenans (∼74%) and μ-carrageenans (∼3%). However, a significant percentage of these galactans (at least 14%) is composed of sulfated agarans and, possibly, agaran-type sulfated dl-hybrid galactans. These agarans are partially substituted on C-2 or C-4 or disubstituted on both positions of the β-d-galactose units and on C-3 or C-2 and C-3 of the α-l-galactose residues with sulfate groups or single stubs of β-d-xylopyranose, d-glucopyranose, and galactose or with d-glucopyranosyl-(1→4)-d- glucopyranose side chains. Significant quantities of 2-O-methyl- and 3-O-methyl-l-galactose units are also present. A great tendency to retain Ca 2+ and Mg 2+, in spite of massive treatments with Na + and K + salts, was observed. The complexation between agarans and agarans - κ-carrageenans through divalent cations and the possible zipper-type carbohydrate - carbohydrate interactions would be two complementary mechanisms of interactions. © 2004 Elsevier Ltd. All rights reserved.
format	JOUR
author	Estevez, J.M. Ciancia, M. Cerezo, A.S.
author_facet	Estevez, J.M. Ciancia, M. Cerezo, A.S.
author_sort	Estevez, J.M.
title	The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
title_short	The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
title_full	The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
title_fullStr	The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
title_full_unstemmed	The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents
title_sort	system of galactans of the red seaweed, kappaphycus alvarezii, with emphasis on its minor constituents
url	http://hdl.handle.net/20.500.12110/paper_00086215_v339_n15_p2575_Estevez
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The system of galactans of the red seaweed, Kappaphycus alvarezii, with emphasis on its minor constituents

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