I. J. Miller
The Structure of the Carrageenan Extracted from the Tetrasporophytic Form of Stenogramme interrupta as Determined by 13 C NMR Spectroscopy
The polysaccharide extracted from the tetrasporophytic form of Stenogramme interrupta was examined by means of 13C NMR spectroscopy and the spectra were analysed by means of set theory. The polysaccharide consisted mainly of 4-linked D-galactosyl-6-sulfate units alternating with 3-linked D-galactosyl-6-sulfate units, and is hence the precursor to ?-carrageenan. A minor component may have comprised 4-linked D-galactosyl-6-sulfate units alternating with 3-linked D-galactosyl-2,6-disulfate units. Thus the polysaccharide from the tetrasporophytic form differs from that of the gametophytic form, as has been reported for other members of the Phyllophoraceae and Gigartinaceae, but this carrageenan is not the expected ?-carrageenan. The result has, however, similarities with those found in the closely related genus Phyllophora. Finally, methylation of ?-carrageenan led to methylated ?-carrageenan, demonstrating that sulfate groups cannot necessarily be relied on to remain immobile during a linkage analysis.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 44, 11/2001
Pages: 583 - 587
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