アメリカスズカケノキのトリテルペン酸について

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タイトル別名
  • On the Triterpenic Acid of <i>Platanus occidentalis</i> LINN
  • アメリカスズカケノキ ノ トリテルペンサン ニ ツイテ

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説明

The ethanolic extract of the dried bark of Platanus occidentalis LINN. contains a portion insoluble in water and a 10%, NaOH solution. From the ether-soluble part (insoluble part 0.38%) of this portion, hydroxytriterpenic acid was obtained via its potassium salts (1.85%). The free acid (1.72%) was recrystallized from ethanol, giving colorless needles, m.p. 310_??_311°, which were proved to be identical with betulinic acid isolated from the calyx of Japanese persimmon. The ether-soluble neutral substance (0.75%), after hydrolysis, yielded sitosterol and stearic acid. From the 10% NaOH-soluble portion, three acidic parts were separated extracting the freed acidic ethereal solution with Na2HCO3-, Na2CO3- and NaOH-solutions. Yields were 0.01%, 0.02% and 0.02% respectively. Besides these, 0.08% of the neutral part was also obtained. From the heartwood of the same plant colorless needles were obtained, m. p. 310_??_311°, which were proved to be identical with betulinic acid by admixing them With the authentic specimen.

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