Structural characterization of a 2-O-acetylglucomannan from Dendrobium officinale stem
A heteropolysaccharide, obtained from an aqueous extract of dried stem of Dendrobiumofficinale Kimura et Migo by anion-exchange chromatography and gel-permeationchromatography, was investigated by chemical techniques and NMR spectroscopy, and isdemonstrated to be a 2-O-acetyl glucomannan, composed of mannose, glucose and arabinose in40.2:8.4:1 molar ratios. It has a backbone of (1? 4)-linked β-D-rnannopyranosyl residues andβ-D-glucopyranosyl residues, with branches at O-6 consisting of terminal and (1? 3)-linked Manp,(1? 3)-linked Glcp, and a small proportion of arabinofuranosyl residues at the terminal position.The acetyl groups are substituted at O-2 of(1? 4)-linked Manp and Glcp. The main repeating unitof the polysaccharide is reported.
铁皮石斛 多糖 阴离子交换层析 核磁共振光谱
Yun-fen Hua Ming Zhang Cheng-xin Fu Zhang-hui Chen
Lab of Plant Systematic Evolution and Biodiversity,College of life Science,Zhejiang University Institute of biotechnology,College of life Science,Zhejiang University,Hangzhou 310012,China
国内会议
杭州
英文
27-35
2004-10-01（万方平台首次上网日期，不代表论文的发表时间）