Further studies on the structure of polysaccharides from the lichen Flavoparmelia caperata (L.) Hale.
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.
Takeda
Tadahiro
T
Kyoritsu College of Pharmacy, Tokyo, Japan. Takeda-td@kyoritsu-ph.ac.jp
Shimizu
Noriko
N
Watanabe
Sachiko
S
Edagawa
Yoshikuni
Y
Ito
Yoshihisa
Y
Narui
Takao
T
Shibata
Shoji
S
D008011:Lichens; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification*
D010936:Plant Extracts; D011134:Polysaccharides