I. J. Miller
The Structures of the Polysaccharides from Two Lophurella Species as Determined by
13C NMR Spectroscopy
The polysaccharide extracts from Lophurella hookeriana and Lophurella caespitosa together with some derivatives have been examined by 13C nuclear magnetic resonance spectroscopy and the spectra analysed with the techniques of set theory. The polysaccharides are agaroids that consist of 3-linked D-galactose and 4-linked L-galactose or anhydro-L-galactose. The polysaccharides from both algae were partially sulfated at the 2- and 6-positions of both the 3- and 4-linked units. The polysaccharide from Lophurella hookeriana comprised at least 90% anhydrogalactosyl precursor diads, and was otherwise between 65–75% unsubstituted, with approximately 22% of the 4-linked units being 2-sulfated, 12% of the 3-linked units being 2-sulfated, and 15% of the 3-linked units being 6-sulfated. The polysaccharide from Lophurella caespitosa contained approximately 15% anhydrogalactosyl precursors, 40% L-galactose that was not convertible to anhydrogalactose, and no more than 25% unsubstituted agarose diads following alkali treatment. Approximately 55% of the 4-linked units were 2-sulfated, 28% of the 3-linked units were 2-sulfated, and 25% of the 3-linked units were 6-sulfated.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 45, 07/2002
Pages: 373 - 379
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