Abstract
The mycelium of an Chinese edible fungus ( Cordyceps sinensis) was found to contain a d-glucan. Methylation, Smith degradation, acetolysis, NMR spectroscopy ( 1H, 13C, 13C– 1H 2D-COSY) and acid hydrolysis studies were conducted to elucidate its structure. The results indicated that the d-glucan consisted of a backbone composed of (1→4)- d-glucosyl residues and carried a single (1→6)-linked d-glucosyl residue. α- d-glucosidic linkages were present in the polysaccharide according to i.r. and NMR spectra. The d-glucan gave with iodine a faint blue color that had λ max 564 nm, indicating the polysaccharide of α-(1→4)-linkages with short, exterior chains.
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