薬用資源の研究 (第10報)
てらちぐるみの成分について
1958 年 78 巻 5 号 p. 521-522
詳細
1958 年 78 巻 5 号 p. 521-522
Extraction of fresh leaves of Juglans regia L. var. sinensis C. DC. with methanol and treatment of the methanol extract with lead acetate afforded pale yellow scales, m.p. 224-225°, [α]23D: -169°, C20H18O10⋅1 1/2H2O, in 0.1% yield. This substance was named juglanin. Hydrolysis of juglanin with 5% sulfuric acid gave 1 mole each of kaempferol and arabinose, and permethylation with diazomethane followed by hydrolysis afforded 5, 7, 4′-tri-O-methyl-kaempferol. It follows, therefore, that the sugar is bonded to the 3-position and juglanin is kaempferol 3-arabinoside.
