25545-08-8Relevant academic research and scientific papers
Tannins and Related Compounds. XXIII. Rhubarb (4): Isolation and Structures of New Classes of Gallotannins
Kashiwada, Yoshiki,Nonaka, Gen-ichiro,Nishioka, Itsuo
, p. 3461 - 3470 (2007/10/02)
A chemical examination of hydrolyzable tannins in a rhubarb of high quality (commercial name: ) has revealed the occurrence of four new acylated sugars, i.e., 2-O-cinnamoyl-β-D-glucose (I), 2-O-cinnamoyl-1-6-di-O-galloyl-β-D-glucose (II), 2-O-p-coumaroyl-1-O-galloyl-β-D-glucose (III) and 1-O-galloylfructose (IV), as well as the known compounds 2-O-cinnamoyl-1-O-galloyl-β-D-glucose (VII), (-)-epicatechin 3-O-gallate (VIII), 1-O-galloyl-β-D-glucose (IX) and 1,6-di-O-galloyl-β-D-glucose (X).A low-quality rhubarb (commercial name: ) was found to contain three new gallates, 1-O-galloylfructose (IV), 2,6-di-O-galloylglucose (V) and 3,5-dihydroxyphenol 1-O-β-D-(6-O-galloyl)-glucopyranoside (VI), together with five known compounds, VIII, X, 6-O-galloylglucose (XI), 1,2,6-tri-O-galloyl-β-D-glucose (XII) and procyanidin B-1 3-O-gallate (XIII).Keywords - rhubarb; Polygonaceae; gallotannin; cinnamoylglucose; p-coumaroylglucose; galloylfructose; phloroglucinol glucoside gallate; galloylglucose.
Constituents of Cupuliferae, II. - A New Acylated Flavonoid Glycoside from Castanea sativa Mill.
Romussi, Giovanni,Mosti, Luisa,Bignardi, Gaetano
, p. 761 - 764 (2007/10/02)
From leaves of Castanea sativa Mill. in addition to tiliroside , 3>, a new acylated flavonoid glycoside has been isolated and identified as kaempferol 3-O-Glc-(p-coumaroyl)-α-L-rhamnopyranosyl-(1->6)-β-D-glucopyranoside> (1).
