Polysaccharides in Fungi. IX. A β-D-Glucan from Alkaline Extract of Dictyophora indusiata FISCH.

Abstract

A water-soluble β-D-glucan (T-5-N) has been isolated from 1N sodium hydroxide extract of the fruit bodies of Dictyophora indusiata FISCH. T-5-N, [α]¹⁸_D+28.7°(c=0.5, H₂O), IR ν^KBr_maxcm^-1 : 890, was homogeneous as judged by ultracentrifugal analysis and Tiselius-type electrophoresis. Structural analyses indicated that T-5-N has a main chain composed of β-1→3 linked D-glucopyranosyl residues, and two single β-1→6 linked D-glucopyranosyl units are attached as side chains, on average, to every seventh sugar residue of the main chain. In addition, a few internal 1→6 linkages and branching points at position 2 of the β-1→3 linked main chain are also present in the molecule.