かきのへたのトリテルペン酸について

抄録

Ethanolic extract of the calyx of dried Kaki (fruit of Diospyros Kaki L. fil.) was prepared, the portion insoluble in water and dilute alkali (1.2%) was collected, and ether-insoluble portion (0.35%) was removed. Ether-soluble portion yielded hydroxytriterpenic acid (0.37%) as its potassium salt. The neutral substance soluble in ether, 0.375%. The triterpenic acid was repeatedly purified as the potassium salt and acetylated. The fractional crystallization of the product from methanol yielded acetyloleanolic acid as the most sparingly soluble component, followed by acetylbetulinic acid. Hydrolysis of the remainder and recrystallization of the product from methanol yielded ursolic acid. Recrystallization of the mixture of the methyl ester of the acetylated product easily gave the pure product of methyl acetyloleanolate. The portion of the ethanolic extract soluble in water was treated with lead acetate to remove portion precipitating with it and submitted to paper chromatography from which glucose and fructose were identified. Alkalisoluble portion yielded acidic substances extracted by NaHCO₃ (0.255%), Na₂CO₃ (0.13%), and NaOH (0.15%), 1.4% of phlobaphene (?), and 0.105% of a neutral fatty oil. The first two of the acidic substances gave yellowish green coloration with ferric chloride.