Abstract
Extraction of certain lichens with cold dimethyl sulfoxide provided a β- d-glucan virtually free of contaminating α- d-glucan and galactomannan. Applied to Letharia vulpina, the method gave β- d-glucan, and extraction of the residue with hot water followed by cooling gave α- d-glucan. From Usnea sp. a β- d-glucan was isolated, but little α- d-glucan was present. Extraction of Actinogyra muehlenbergii provided a (1→6)-linked β- d-glucopyranan containing one acetyl group for every 8–9 glucosyl units, being present almost exclusively as monosubstituent at O-2, O-3, and O-4.
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