Polysaccharides of basidiomycetes. Alkali-soluble polysaccharides from the mycelium of white rot fungus <Emphasis Type="Italic">Ganoderma lucidum</Emphasis> (Curt.: Fr.) P. Karst |
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Authors: | M S Evsenko A S Shashkov A V Avtonomova L M Krasnopolskaya A I Usov |
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Institution: | (1) Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii pr. 47, 119991 Moscow, Russia;(2) Gause Institute of New Antibiotics, Russian Academy of Medical Sciences, B. Pirogovskaya ul. 11, 119992 Moscow, Russia |
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Abstract: | Two polysaccharides were isolated from submergedly cultured mycelium of the basidiomycete Ganoderma lucidum by extraction with alkali followed by fractionation with Fehling reagent. The polysaccharides were shown to be a linear (1→3)-α-D-glucan and a highly branched xylomannan containing a backbone built up of (1→3)-linked α-D-mannopyranose residues, the majority of which are substituted at O-4 by single β-D-xylopyranose residues or by disaccharide fragments β-D-Manp-(1→3)-β-D-Xylp-(1→. Polysaccharide structures were elucidated by NMR spectroscopy in combination with methylation analysis and periodate oxidation. An interesting feature of the xylomannan is the simultaneous presence of α-D-mannopyranose and β-D-mannopyranose residues, the first forming the backbone, and the second being the non-reducing terminal units of disaccharide side chains. |
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Keywords: | Basidiomycetes white rot fungi Ganoderma lucidum polysaccharides (1→ 3)-α -D-glucan branched xylomannan NMR spectroscopy |
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