Characterization of polysaccharides from cystocarpic and tetrasporic stages of Sub-Antarctic Iridaea cordata

• Published in: Algal Research
• Main Authors: Barahona Urbina, Tamara de Lourdes, Rodríguez Sánchez, Rodrigo Antonio, Noseda, Miguel D., Mansilla, Andrés, Matsuhiro, Betty, Prado, Héctor Juan, Matulewicz, Maria Cristina
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier
• Subjects: AGARAN; CARRAGEENAN; CYSTOCARPIC; IRIDAEA CORDATA; TETRASPORIC; https://purl.org/becyt/ford/1.4; https://purl.org/becyt/ford/1; Antarctic; Argentina; Magallanes; Mansilla; Antarc*
• Online Access: http://hdl.handle.net/11336/149798

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. Fil: Barahona Urbina, Tamara de Lourdes. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones en Hidratos de Carbono. Subsede del Centro de Investigaciones en Hidratos de Carbono | Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones en Hidratos de Carbono. Subsede del Centro de Investigaciones en Hidratos de Carbono; Argentina Fil: Rodríguez Sánchez, Rodrigo Antonio. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones en Hidratos de Carbono. Subsede del Centro de Investigaciones en Hidratos de Carbono | Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones en Hidratos de Carbono. Subsede del Centro de Investigaciones en Hidratos de Carbono; Argentina Fil: Noseda, Miguel D. Universidade Federal do Paraná; Brasil Fil: Mansilla, Andrés. Universidad de Magallanes; Chile Fil: ...