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 η-carrageenan), although some minor components were also present. The C. ovatum galactans are the most highly methylated carrageenans reported.
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