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.
Barahona, T.; Rodríguez Sánchez, R. A. ; Noseda, M. D.; Mansilla, A.; Matsuhiro, B.; Prado, H. & Matulewicz, M. C. (2021). Characterization of polysaccharides from cystocarpic and tetrasporic stages of Sub - Antarctic Iridaea cordata. Algal Research,60, (art102503),7 p.
10.1016/j.algal.2021.102503
Barahona, Tamara,Rodríguez Sánchez, Rodrigo A.,Noseda, Miguel D.,Mansilla, Andrés,Matsuhiro, Betty,Prado, Héctor, et al.. 2021. "Characterization of polysaccharides from cystocarpic and tetrasporic stages of Sub - Antarctic Iridaea cordata". Algal Research 60, no.art102503:7.
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