Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures

Red seaweed Gracilariopsis hommersandii produces important amounts of non-gelling galactans, which were extracted with hot water (GrC, yield, 37%, viscosity average molecular weight, Mv 109 kDa), comprising agarose and sulfated galactan structures. The alkali modified derivative, GrCTr (Mv 95 kDa),...

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Autores principales:	Rodríguez Sánchez, R.A., Canelón, D.J., Cosenza, V.A., Fissore, E.N., Gerschenson, L.N., Matulewicz, M.C., Ciancia, M.
Formato:	JOUR
Materias:	Agar Apiuronic acid D/L-Hybrid galactans Gracilariopsis hommersandii Sulfated galactans Gelation Molar ratio Seaweed Galactans Gelling temperature Rheological property Sulfated polysaccharides Viscosity average molecular weight Polysaccharides
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_01448617_v213_n_p138_RodriguezSanchez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_01448617_v213_n_p138_RodriguezSanchez2023-10-03T14:59:42Z Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures Rodríguez Sánchez, R.A. Canelón, D.J. Cosenza, V.A. Fissore, E.N. Gerschenson, L.N. Matulewicz, M.C. Ciancia, M. Agar Apiuronic acid D/L-Hybrid galactans Gracilariopsis hommersandii Sulfated galactans Gelation Molar ratio Seaweed Agar Galactans Gelling temperature Gracilariopsis hommersandii Rheological property Sulfated galactans Sulfated polysaccharides Viscosity average molecular weight Polysaccharides Red seaweed Gracilariopsis hommersandii produces important amounts of non-gelling galactans, which were extracted with hot water (GrC, yield, 37%, viscosity average molecular weight, Mv 109 kDa), comprising agarose and sulfated galactan structures. The alkali modified derivative, GrCTr (Mv 95 kDa), gave a galactose:3,6-anhydrogalactose molar ratio of 1.0:0.9, and a more regular structure, favouring gelation (melting and gelling temperatures 64 and 14 °C, respectively). The rheological properties of this product suggest possible applications as hydrocolloid. G. hommersandii also biosynthesizes non gelling sulfated galactan fractions with diads constituted by β-D-galactose and partially cyclized α-L-galactose units or non-cyclized α-D-galactose residues. Sulfation was mainly detected on C6 or C4 of the β-D-galactose units, and on C6 and, in minor amounts, on C3 of the α-L-galactose units. The presence of β-apiuronic acid was demonstrated for these fractions as side chains of the galactan backbone. Carrageenan structures were found for the first time in an agarophyte of the Gracilariales. © 2019 Elsevier Ltd JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01448617_v213_n_p138_RodriguezSanchez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Agar Apiuronic acid D/L-Hybrid galactans Gracilariopsis hommersandii Sulfated galactans Gelation Molar ratio Seaweed Agar Galactans Gelling temperature Gracilariopsis hommersandii Rheological property Sulfated galactans Sulfated polysaccharides Viscosity average molecular weight Polysaccharides
spellingShingle	Agar Apiuronic acid D/L-Hybrid galactans Gracilariopsis hommersandii Sulfated galactans Gelation Molar ratio Seaweed Agar Galactans Gelling temperature Gracilariopsis hommersandii Rheological property Sulfated galactans Sulfated polysaccharides Viscosity average molecular weight Polysaccharides Rodríguez Sánchez, R.A. Canelón, D.J. Cosenza, V.A. Fissore, E.N. Gerschenson, L.N. Matulewicz, M.C. Ciancia, M. Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
topic_facet	Agar Apiuronic acid D/L-Hybrid galactans Gracilariopsis hommersandii Sulfated galactans Gelation Molar ratio Seaweed Agar Galactans Gelling temperature Gracilariopsis hommersandii Rheological property Sulfated galactans Sulfated polysaccharides Viscosity average molecular weight Polysaccharides
description	Red seaweed Gracilariopsis hommersandii produces important amounts of non-gelling galactans, which were extracted with hot water (GrC, yield, 37%, viscosity average molecular weight, Mv 109 kDa), comprising agarose and sulfated galactan structures. The alkali modified derivative, GrCTr (Mv 95 kDa), gave a galactose:3,6-anhydrogalactose molar ratio of 1.0:0.9, and a more regular structure, favouring gelation (melting and gelling temperatures 64 and 14 °C, respectively). The rheological properties of this product suggest possible applications as hydrocolloid. G. hommersandii also biosynthesizes non gelling sulfated galactan fractions with diads constituted by β-D-galactose and partially cyclized α-L-galactose units or non-cyclized α-D-galactose residues. Sulfation was mainly detected on C6 or C4 of the β-D-galactose units, and on C6 and, in minor amounts, on C3 of the α-L-galactose units. The presence of β-apiuronic acid was demonstrated for these fractions as side chains of the galactan backbone. Carrageenan structures were found for the first time in an agarophyte of the Gracilariales. © 2019 Elsevier Ltd
format	JOUR
author	Rodríguez Sánchez, R.A. Canelón, D.J. Cosenza, V.A. Fissore, E.N. Gerschenson, L.N. Matulewicz, M.C. Ciancia, M.
author_facet	Rodríguez Sánchez, R.A. Canelón, D.J. Cosenza, V.A. Fissore, E.N. Gerschenson, L.N. Matulewicz, M.C. Ciancia, M.
author_sort	Rodríguez Sánchez, R.A.
title	Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
title_short	Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
title_full	Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
title_fullStr	Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
title_full_unstemmed	Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
title_sort	gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
url	http://hdl.handle.net/20.500.12110/paper_01448617_v213_n_p138_RodriguezSanchez
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Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures

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