info:eu-repo/semantics/article
Characterization of polysaccharides from cystocarpic and tetrasporic stages of Sub-Antarctic Iridaea cordata
Fecha
2021-12Registro en:
Barahona Urbina, Tamara de Lourdes; Rodríguez Sánchez, Rodrigo Antonio; Noseda, Miguel D.; Mansilla, Andrés; Matsuhiro, Betty; et al.; Characterization of polysaccharides from cystocarpic and tetrasporic stages of Sub-Antarctic Iridaea cordata; Elsevier; Algal Research; 60; 12-2021; 1-7
2211-9264
CONICET Digital
CONICET
Autor
Barahona Urbina, Tamara de Lourdes
Rodríguez Sánchez, Rodrigo Antonio
Noseda, Miguel D.
Mansilla, Andrés
Matsuhiro, Betty
Prado, Héctor Juan
Matulewicz, Maria Cristina
Resumen
The polysaccharide systems from cystocarpic and tetrasporic phases of the Sub-Antarctic algae Iridaea cordata were studied. Cystocarpic plant polysaccharides are mainly composed by carrageenans of the κ–family. However, agaran structures were also detected in the fraction soluble in 2.00 M KCl, after fractionation with increasing potassium chloride solutions. The presence of β-D-galactose-α-L-galactose 3-sulfate, β-D-galactose-α-L-galactose 6-sufate, β-D-galactose 6-sulfate-α-L-galactose 6-sufate, and of β-D-galactose 4-sulfate-α-L-galactose 2,3-disulfate diads was confirmed by means of methylation and NMR spectroscopy analyses; the latter diad has been scarcely reported. The first extracts from tetrasporic plants rendered a pure λ-carrageenan with considerable yield, which confers this species promising commercial applications. In some cystocarpic and tetrasporic extracts α-glucose was also found and assigned to floridean starch by 1H-13C HSQC NMR spectroscopy.