A nearly idealized 6'-O-methylated iota-carrageenan from the Australian red alga Claviclonium ovatum (Acrotylaceae, Gigartinales) |
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Authors: | Chiovitti Anthony Bacic Antony Craik David J Kraft Gerald T Liao Ming-Long |
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Institution: | School of Botany, University of Melbourne, Victoria 3010, Australia. |
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Abstract: | The polysaccharides extracted from Claviclonium ovatum were studied by a combination of compositional assays, reductive partial hydrolysis, linkage analysis, Fourier Transform infrared (FTIR) spectroscopy, and 13C, 1H, and 13C/1H heteronuclear multiple quantum correlation (HMQC) two-dimensional nuclear magnetic resonance (NMR) spectroscopy. The chemical and spectroscopic data showed that the alkali-modified C. ovatum polysaccharides are composed of a nearly idealized repeating unit of 6'-O-methylcarrabiose 2,4'-disulfate (the repeating unit of 6'-O-methylated iota-carrageenan), although some minor components were also present. The C. ovatum galactans are the most highly methylated carrageenans reported. |
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Keywords: | Acrotylaceae Australia Carbohydrate analysis Gigartinales η-Carrageenan O-Methyl ether Polysaccharide structure Rhodophyta |
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