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Structural analysis of carrageenans from the tetrasporic stages of the red algae,Gigartina lanceataandGigartina chapmanii(Gigartinaceae, Rhodophyta)

Authors
Journal
Carbohydrate Research
0008-6215
Publisher
Elsevier
Publication Date
Volume
307
Identifiers
DOI: 10.1016/s0008-6215(98)00030-5
Keywords
  • Carrageenan
  • Sulfated Galactan
  • Gigartina Lanceata
  • Gigartina Chapmanii

Abstract

Abstract The use of modern analytical techniques has facilitated the identification of the polysaccharides from tetrasporophytic Gigartina lanceata and Gigartina chapmanii. The G. lanceata polysaccharide corresponds, very closely, to the idealised structure of λ-carrageenan ([G2S-D2S,6S] n). That from G. chapmanii contains predominantly ξ-carrageenan ([G2S-D2S] n), but with about one in seven of the 3-linked units also has a pyruvate acetal group at the 4- and 6-positions, one in four of the 4-linked units is also sulfated at the 6-position, and a small but significant number of 4-linked 3,6-anhydrogalactosyl 2-sulfate units are present.

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