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The lambda components of the intermediate fractions of the carrageenan from iridaea undulosa

The lambda components of the intermediate fractions of the carrageenan from iridaea undulosa

Carbohydrate Research 172(1): 139-146

The "intermediate" fractions of the carrageenan of Iridaea undulosa, which are precipitated at 1.20-1.25M, 1.35-1.40M, and 1.55-1.65M concentrations of potassium chloride, are mixtures of .mu./v-carrageenans and .lambda.-carrageenans. The .lambda.-carrageenans contain mainly 3-linked, 2-sulfated (33.5-39.0%) and 2,6-disulfated (5.6-11.8%) galactose units, together with 4-linked, 2-sulfated (1.8-5.9%), 6-sulfated and/or 2,6-disulfated (39.0-40.1%), and other 2,6-disubstituted (3.7-4.3%) galactose residues. The presence of this last unit suggests that some C-6 atoms must be either branching points or blocked by glycosidic linkages. When the compositions of these gel-forming .lambda.-carrageenans are compared with those of the "soluble" .lambda.-carrageenans from the same seaweed, it is clear that in the latter ones there is a higher diversification of the structural units and more "solubility-promoting" residues.

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