Gracilariopsis hommersandii, a red seaweed, source of agar and sulfated polysaccharides with unusual structures
| Autor: | Lia Noemi Gerschenson, Eliana Noemi Fissore, Dilsia J. Canelón, María C. Matulewicz, Vanina A. Cosenza, Rodrigo Sanchez, Marina Ciancia |
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| Rok vydání: | 2019 |
| Předmět: |
Polymers and Plastics
02 engineering and technology 010402 general chemistry Polysaccharide 01 natural sciences chemistry.chemical_compound Sulfation Polysaccharides Carbohydrate Conformation Materials Chemistry chemistry.chemical_classification biology Sulfates Organic Chemistry Gracilariales Galactan Seaweed 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences Carrageenan Molecular Weight Agarophyte Agar chemistry Galactose Agarose 0210 nano-technology Nuclear chemistry |
| Zdroj: | Carbohydrate Polymers. 213:138-146 |
| ISSN: | 0144-8617 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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