Polysaccharides in Fungi. V. Isolation and Characterization of a Mannan from Aqueous Ethanol Extract of Dictyophora indusiata FISCH.

概要

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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]^<20>_D+116°(c=0.1,H_2O), 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.
公益社団法人日本薬学会の論文
1980-09-25