1953 年 73 巻 2 号 p. 131-134
The yellow crystals (II) obtained from the ether-soluble portion, and the crystals (III) from the ethyl acetate-soluble portion, of the methanolic extract of the flowers of Erigeron annuus and E. macranthus, were further examined and (II) was found to be quercetin. The flavone compound (III) yielded apigenin as the aglycone and was found to be bonded to glucuronic acid. The bonding ratio was one molecule each and the position of the bonding was the C7 of apigenin which indicated the glucuronide to be apigenin-7-glucuronide. This is a new flavone glucuronide never previously found in nature.