17353-48-9Relevant articles and documents
Flavonol glucuronides and C-glucosidic ellagitannins from Melaleuca squarrosa
Yoshimura, Morio,Ito, Hideyuki,Miyashita, Kyoko,Hatano, Tsutomu,Taniguchi, Shoko,Amakura, Yoshiaki,Yoshida, Takashi
, p. 3062 - 3069 (2008)
Two flavonoids and three ellagitannins, squarrosanins A, B, and C, were isolated from the leaves of Melaleuca squarrosa. The flavonoids were characterized structurally as kaempferol-3-O-(2″-O-galloyl)-glucuronide and herbacetin-3-O-glucuronide, while the ellagitannins were characterized as monomeric and dimeric C-glucosidic ellagitannins by application of spectroscopic and chemical methods. The antioxidant effect of the polyphenolic constituents of the M. squarrosa leaves was also examined in vitro, and C-glucosidic tannins including oligomers were shown to be more effective radical scavengers against 1,1-diphenyl-2-picrylhydrazyl (DPPH) than flavonoids and ordinary ellagitannins.