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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2019
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v213_n_p138_RodriguezSanchez http://hdl.handle.net/20.500.12110/paper_01448617_v213_n_p138_RodriguezSanchez |
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paper:paper_01448617_v213_n_p138_RodriguezSanchez2023-06-08T15:12:07Z Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures 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 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v213_n_p138_RodriguezSanchez 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 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 |
| 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 |
| publishDate |
2019 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v213_n_p138_RodriguezSanchez http://hdl.handle.net/20.500.12110/paper_01448617_v213_n_p138_RodriguezSanchez |
| _version_ |
1768546669810417664 |