Abstract
A new type of mannan (T-2-HN) has been isolated as a neutral homoglycan from the aqueous 70% ethanol extract of the fruit bodies of Dictyophora indusiata FISCH., which grows in China. T-2-HN was homogeneous as judged by gel filtration (Sepharose 2B) and Tiselius-type electrophoresis. It was composed of D-mannose and a trace of glucose in a molar ratio of 100 : 1, and contained O-acetyl groups in the proportion of about one acetyl group per two sugar residues. Its highly positive specific rotation, [α]20D+116°(c=0.1, H2O), and the presence of an absorption band at 820 cm-1 (type 2a) in the infrared spectrum suggested that most of the glycosidic linkages in this mannan are of α-D configuration. Structural analysis indicated that T-2-HN has a linear chain composed largely of α-1→3 linked D-mannosyl residues, but the linear chain also contains traces of 1→6 linked D-mannopyranosyl (and/or glucosyl) residues. In addition, trace amounts of branching points are present at position 2 or 4 on each of the 1→3 linked D-mannose residues.
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