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The systems of carrageenans from cystocarpic and tetrasporic stages from Iridaea undulosa: Fractionation with potassium chloride and methylation analysis of the fractions



The systems of carrageenans from cystocarpic and tetrasporic stages from Iridaea undulosa: Fractionation with potassium chloride and methylation analysis of the fractions



Carbohydrate Research 242: 217-227



The carrageenans produced by the cystocarpic and tetrasporic stages from Iridaea undulosa were fractionated by potassium chloride precipitation and analyzed. The cystocarpic system is composed of similar amounts of a gelling carrageenan with kappa/L-characteristics, and a soluble, partially cyclized, mu/v-carrageenan. The tetrasporic system is composed mainly of a lambda-carrageenan but also with a small proportion of a galactan sulfate containing L-galactose. The structures of the components of both were examined by methylation analysis. Correlation with previous data from carrageenans of the same and different sources allows us to investigate some of the problems in the chemistry of these polysaccharides, namely: (a) the formal pattern of the systems biosynthesized by each stage of the seaweed and the relationships between the components, (b) general relationships between the primary structure and solubility in potassium chloride solutions, and (c) the solubility of carrageenan mixtures versus that of "pure" compounds in these solutions.

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Accession: 009630711

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DOI: 10.1016/0008-6215(93)80036-e


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