title: Further studies on the structure of polysaccharides from the lichen Flavoparmelia caperata (L.) Hale.
abstract: A water-soluble polysaccharide called PC-2 was previously isolated from Flavoparmelia caperata (L.) Hale and assigned to alpha(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 (1)H- and (13)C-NMR spectroscopic studies suggested that PC-2A is composed of repeating units of [alpha-D-Glc1-3](3), : [alpha-D-Glc1-4](2), while PC-2B and PC-2C are partly branched galactoglucomannans consisting of (1-3)- and (1-4)-linked alpha-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 (Gyelink & Foriss) Hale, is identical to PC-2 based on the chemical and spectroscopic data.
authors.affiliation: Kyoritsu College of Pharmacy, Tokyo, Japan. Takeda-td@kyoritsu-ph.ac.jp
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Takeda
authors.forename: Noriko
authors.initials: N
authors.lastname: Shimizu
authors.forename: Sachiko
authors.initials: S
authors.lastname: Watanabe
authors.forename: Yoshikuni
authors.initials: Y
authors.lastname: Edagawa
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Ito
authors.forename: Takao
authors.initials: T
authors.lastname: Narui
authors.forename: Shoji
authors.initials: S
authors.lastname: Shibata
mesh_terms: D008011:Lichens; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D010936:Plant Extracts; D011134:Polysaccharides