淫羊藿黄酮类组分表观溶解度和油水分配系数的测定

目的:测定淫羊藿黄酮类组分的表观溶解度和油水分配系数,为该组分整体水溶性和脂溶性的表征提供参考。方法:以淫羊藿黄酮类组分为模型药物,采用HPLC测定朝藿定A,B,C及淫羊藿苷在不同缓冲液中的平衡溶解度和表观油水分配系数(Papp),流动相乙腈-水(25∶75),检测波长270 nm。结果:朝藿定A,B,C和淫羊藿苷在不同pH缓冲液中的整体平衡溶解度顺序为朝藿定B>朝藿定A>朝藿定C>淫羊藿苷,Papp总体变化趋势均为先变大后变小再变大,油水分配系数-1.437~3.147。结论:淫羊藿黄酮类组分的水溶性及脂溶性较好,在不同pH缓冲液中变化趋势相近,朝藿定B属于微解,朝藿定A,C和淫羊藿苷属于极微溶解。

Determination of Apparent Solubility and Oil/water Partition Coefficient of Flavonoid Components from Epimedii Folium

Objective: To determine apparent solubility and apparent oil/water partition coefficient of flavonoid components from Epimedii Folium,so as to lay foundation for overall solubility characterization of these components. Method: Taking flavonoid components from Epimedii Folium as model drug,HPLC was adopted to determine equilibrium solubilities and apparent oil/water partition coefficients(P_app) of epimedin A,B,C and icariin in different pH buffers by taking mobile phase of acetonitrile-water(25:75) and detection wavelength at 270 nm. Result: Overall equilibrium solubilities of flavonoid components from Epimedii Folium in different pH buffers were in order of epimedin B>epimedin A>epimedin C>icariin,oil/water partition coefficients were -1.437-3.147,overall trends of P_app were changed from small to large and then to small,to large at last. Conclusion: Water-soluble and fat-soluble of flavonoid components from Epimedii Folium were well with a similar overall trend,epimedin B belonged to slightly soluble,epimedin A,C and icariin belonged to very slightly soluble.