期刊
CARBOHYDRATE RESEARCH
卷 339, 期 13, 页码 2219-2224出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2004.05.034
关键词
Dendrobium oficinale Kimura and Migo; polysaccharide; glucomannan; structure
A heteropolysaccharide obtained from an aqueous extract of dried stem of Dendrobium officinale Kimura and Migo by anion-exchange chromatography and gel-permeation chromatography, was investigated by chemical techniques and NMR spectroscopy, and is demonstrated to be a 2-O-acetylglucomannan, composed of mannose, glucose, and arabinose in 40.2:8.4:1 molar ratios. It has a backbone of (1-->4)-linked beta-D-mannopyranosyl residues and beta-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 unit of the polysaccharides is reported. (C) 2004 Elsevier Ltd. All rights reserved.
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