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Butylidenephthalide 藥物動力學之 研究

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Butylidenephthalide 藥物動力學之 研究

川芎抗痙攣主成分 Butylidenephthalide ,簡稱 Bdph ,已發現此藥具有對 抗心絞痛的作用。為了更進一步瞭解其口服吸收情形及藥物藥效學與藥物 動力學之關係,我們進行以下之實驗。利用高效液相層析分析技術,分析 家兔靜脈注射加口服 Bdph 之濃度。以正相的矽膠充填管柱 (5 μm, 4×250m m) 及正己烷與氯仿 (1:1, v/v) 所組成的混合液,分別作為固定相和移動 相。此外使用波長 254 nm 之紫外光與積分儀,檢測和記錄 Bdph 之波峰高 度。正己烷和 95﹪ 的乙醇 (49:1, v/v) 混合液,則作為萃取血漿中 Bdph 與 其內標準品 dibutylphthalate 之溶液。以上述高效液相層析分析方法,所 測得 Bdph 之血中濃度達 0.01 μg/ml 。實驗是以家兔為對象,分別予以靜 脈注射 10 、 30 和 90 mg/kg 及口服 60 mg/kg 之 Bdph ,藉此得到 Bdph 在家兔體內之藥物動力學參數,由此參數我們可得知家兔對於 Bdph 之吸 收,分佈及排除情形。假設為線性藥物動力學的條件下,實驗結果顯示,

Bdph 靜脈注射 90 mg/kg ,可得其藥物動力學參數 clearance 780.8±306.9 ml/min ,V ss 118638±104153 ml ,T 1/2 172.4±69.8 min ,而口服 60 mg/

kg ,其 Bdph 之生体可用率約 17﹪ , clearance 4465.9±1548.3 ml/min ,V ss 13.7×10 ±9.5×10 ml  ,T 1/2 210.5±145.7 min ,觀察值之 Cmax 及 Tma x 為 0.169±0.093μg/ml 和 101.3±27.5 min 。至於靜脈注射 10 及 30 mg/kg 的劑量下,因為時間濃度指數圖不能清楚見其排除曲線,所以其動力學參 數未能分析,為了改進此項缺失,則有待將來使用氣相層析分析技術,希 望進一步能夠提高其敏感度,藉此求得我們較滿意之結果。

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