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題 名 | 大爪石斛之抗血小板凝集活性成分之分離=Isolation of the Antiplatelet Principles from Ephemerantha Lonchophylla |
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作 者 | 陳建志; | 書刊名 | 中醫藥年報 |
卷 期 | 16:2 1998.05[民87.05] |
頁 次 | 頁297-310 |
分類號 | 414.33 |
關鍵詞 | 大瓜石斛; 抗血小板凝集; Ephemerantha lonchophylla; Antiplatelet aggregation; |
語 文 | 中文(Chinese) |
中文摘要 | 中藥材石斛來源於蘭科石斛屬(Dendrobium)植物之乾燥莖,具 生津益胃、溼陰潤肺及解熱止渴。在臺灣,大爪石斛(Ephemerantha lonchophylla)亦被用來當做石斛藥材。在找尋具抗血小板凝集活性 之天然物之工作中,我們發現,大爪石斛的乙醇抽出物對 arachidonic acid(AA)所引起的血小板凝集具有很強的抑制活性。 在生物活性的追蹤分離,我們大爪石斛的乙醇抽出物,共得到兩 種新化合物ephemeranthol-H(5)及ephemeranthone (6), 及四種 已知化合物denbinobin(1), 3, 7-dihydroxy-2,4-dimethoxyphenanth- rene(2), 3-methylgigantol(3), 及erianthridin(4)。化合物4、2、 3及6顯示抗血小板凝集活性,對因AA所引起的血小板凝集,其IC�t 值分別約為9 uM、24uM、30uM及60uM。 |
英文摘要 | The Chinese herb "Shi-Hu" is prepared from the dried stems of Dendrobium species (Orchidaceae), and is used as a tonic to nourish the stomach, promote the production of body fluid, and reduce fever. Ephemerantha lonchophylla is also as a source of "Shi-Hu" in Taiwan. In the course of continuing search for natural products as antiplatelet aggregation agent, we found that an ethanolic extract of the stems of E. lonchophylla showed significant inhibitory activity against arachidonic acidinduced platelet aggregation in vitro. Bioactivity-directed fractionation of this extract has led to the isolation and identification of two new compounds, ephemeranthol-H(5)and ephemeranthone(6), along with four known componds, denbinobin (1), 3,7-dihydroxy-2, 4-dimethoxyphenanthrene (2), 3-methylgigantol (3), and erianthridin (4). Compounds 4, 2, 3, and 6 exhibited antiplatelet aggregation activities. In AA- induced platelet aggregation the IC�tvalues for compounds 4, 2, 3, and 6 were determined as 9 uM, 24 uM, 30 uM, and 60 uM, respectively. |
本系統中英文摘要資訊取自各篇刊載內容。