Carrageenan and agaran structures from the red seaweed Gymnogongrus tenuis
The galactan system biosynthesized by the red seaweed Gymnogongrus tenuis (Phyllophoraceae) is constituted by major amounts of κ/ι-carrageenans, with predominance of ι-structures, which were isolated by extraction with hot water in high yield (∼45%). A small amount of non-cyclized carrageenans mostl...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Publicado: |
2016
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v136_n_p1370_PerezRecalde http://hdl.handle.net/20.500.12110/paper_01448617_v136_n_p1370_PerezRecalde |
| Aporte de: |
| Sumario: | The galactan system biosynthesized by the red seaweed Gymnogongrus tenuis (Phyllophoraceae) is constituted by major amounts of κ/ι-carrageenans, with predominance of ι-structures, which were isolated by extraction with hot water in high yield (∼45%). A small amount of non-cyclized carrageenans mostly of the ν-type was also obtained. Besides, 12% of these galactans are agaran structures, which were present in major quantities in the room temperature water extracts, but they were also found in the hot water extract. They are constituted by 3-linked β-d-galactose units partially substituted on C-6 with sulfate or single stubs of β-d-xylose and 4-linked residues that comprise α-l-galactose units partially sulfated or methoxylated on C-3 or sulfated on C-3 and C-6 and 3,6-anhydro-α-l-galactose. Related structural patterns were previously found for agarans synthesized by other carrageenophytes. Results presented here show that these agarans are low molecular weight molecules independent of the carrageenan structures, with strong interactions between them. © 2015 Published by Elsevier Ltd. |
|---|