A water-soluble polysaccharide called PC-2 was previously isolated from Flavoparmelia caperata (L.) Hale and assigned to α(1-3)(1-4)glucan. However, PC-2 separated into three components, PC-2A, PC-2B, and PC-2C (a single peak in HPLC, respectively) on further purification. Methylation analysis and 1H- and 13C-NMR spectroscopic studies suggested that PC-2A is composed of repeating units of [α-D-Glc1-3]3, : [α-D-Glc1-4]2, while PC-2B and PC-2C are partly branched galactoglucomannans consisting of (1-3)- and (1-4)-linked α-D- glucopyranosyl units as the main chain. In addition we confirmed that the polysaccharide fraction PB-2 from the lichen of the same genus, Flavoparmelia baltimorensis (Gyelnik & Foriss) Hale, is identical to PC-2 based on the chemical and spectroscopic data.
ASJC Scopus subject areas
- 化学 (全般)