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I. J. Miller

The Chemical Structure of Galactans from Some New Zealand Red Algae

The polysaccharides from six New Zealand species of red seaweed were examined by ¹³C NMR spectroscopy, and found to have the following structures: Caulacanthus ustulatis (Caulacanthaceae): 3:1 ?/?-hybrid carrageenan; Craspedocarpus erosus (Cystocloniaceae): ?-carrageenan; Callophyllis hombroniana (Kallymeniaceae): ?-carrageenan together with minor components including up to 10% pyruvylation, and 4-linked D-and L-galactose; Gracilaria truncata (Gracilariales) (two new samples): agar, agar with 45 % 6-O-methylation on the 3-linked unit; Capreolia implexa (Gelidiales): agar with 10% 6-O-methylation on the 3-linked unit and 6% 2-O-methylation on the anhydrogalactosyl unit; Gymnogongrus torulosus: 1:1.15 ?/?-hybrid carrageenan with precursors. The ¹³C NMR spectra of the two precursors are very similar to each other. The set of plants termed Gracilaria truncata may include more than one species.

Botanica Marina, Walter de Gruyter

Print ISSN: 0006-8055
Volume: 46, 11/2003
Pages: 572 - 577

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