A Glucomannan from the Tubers of Dioscorea japonica THUNB.

概要

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A polysaccharide, [α]^<20>_D-35.8° in water, was isolated from the tubers of Dioscorea japonica THUNB. The polysaccharide was homogeneous as judged by ultracentrifugal analysis and gel chromatography. It was mainly composed of D-mannose and D-glucose in a molar ratio of 6 : 1,and contained 8.8% O-acetyl groups. Its molecular weight was estimated to be 3.7×10^5 by gel chromatography. The O-acetyl groups were located at position 2,at position 6,at position 3,and at positions 2 and 6,of some of the mannopyranosyl residues. From the results of methylation analysis, periodate oxidation, Smith degradation, and carbon-13 nuclear magnetic resonance spectroscopy, it was concluded that the polysaccharide, a linear glucomannan, was composed of β-1→4 linked D-aldohexopyranosyl units.
社団法人日本薬学会の論文
1985-01-25