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  • Title: Composition and distribution of carrabiose moieties in hybrid kappa-/iota-carrageenans using carrageenases.
    Author: Guibet M, Boulenguer P, Mazoyer J, Kervarec N, Antonopoulos A, Lafosse M, Helbert W.
    Journal: Biomacromolecules; 2008 Jan; 9(1):408-15. PubMed ID: 18081251.
    Abstract:
    Hybrid kappa/iota-carrageeans extracted from Gigartina skottsbergii, Chondracanthus chamissoï, and Chondrus crispus were incubated with Pseudoalteromonas carrageenovora kappa-carrageenase and Alteromonas fortis iota-carrageenase. The degradation products as well as the resistant fraction were fully characterized by chromatography, NMR, and mass spectrometry. The low percentage of degradation observed after treatment by the iota-carrageenase suggests that long segments of iota-carrabiose or block of iota-carrageenan are low in abundance. The degradation products of the kappa-carrageenase allow discriminating three modes of kappa-carrabiose distribution: blocks of kappa-carrabiose, kappa-carrabiose rich fraction containing iota-carrabiose units probably randomly distributed, and iota-carrabiose rich fraction which corresponds to the resistant fraction. The proportions of each fraction were related to the botanical origin as well as the place of growth of the seaweed.
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