Abstract
A neutral polysaccharide has been isolated from the alkaline extract of the fruit bodies of Tremella fuciformis BERK, which grow in China. It was composed of xylose, mannose, galactose and glucose in molar ratios of 2 : 4 : 5 : 35. Its molecular weight was estimated at 8000, and it showed a positive specific rotation ([α]20D+9° in H2O). The results of periodate oxidation, Smith-type degradation, partial acid hydrolysis and methylation studies suggested that the heteroglycan consisted of main units of 1→6 linked glucopyranosyl residues possessing branch points at position 3 in part and small amounts of 1→3 linked glucopyranosyl residues, to which minor units of mannopyranosyl residues having branches at position 2 and 3, and galactofuranosyl (or galactopyranosyl) residues possessing branches at position 2 and 6 (or 3 and 6) attached. Also, the structure was proved to contain moieties of 1→4 linked glucopyranosyl, 1→2 and 1→6 linked galactfuranosyl, and non-reducing terminal glucopyranosyl and xylopyranosyl residues.
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