利用体外脂解模型评价Ⅰ型脂质制剂

Use of an in vitro lipolysis model to evaluate type Ⅰ lipid formulations

以吲哚美辛为模型药物,分别以中链混合甘油酯CapmulMCM和长链极性油LabrafilM1944CS为Ⅰ型脂质制剂,利用体外脂解模型研究药物的肠道分配和增溶作用。结果发现,脂质制剂消化后水性分散相对吲哚美辛的增溶能力较强;脂解程度和速度与脂质辅料的结构有关,长链极性油脂质溶液消化后分配进入水性分散相的药物比中链混合甘油酯少,不利于吸收;脂质制剂消化后水性分散相中药物浓度随载药率提高呈现线性增加。研究结果提示,在筛选脂质制剂的处方时,需考虑脂解程度和速率可能对药物吸收产生的不利影响;脂质混悬液比载药量低的脂质溶液可能更有利于药物吸收。体外脂解模型能为Ⅰ型脂质制剂的处方筛选和评价以及体内外相关性研究提供依据。

The distribution fate and solubilization behavior of indomethacin through the intestinal tract were investigated with in vitro lipolysis model, by comparing the Capmul MCM and Labrafil M 1944 CS type Ⅰ lipid formulations. The results showed that the more favorable solubilization was in the aqueous digestion phase from each lipid formulations for indomethacin. The lipolysis rate and extent were decided with chemical constitution of the lipid excipients, which meant that less indomethacin was transfered from the long chain polar oil lipid solution into the aqueous digestion phase. Increasing the concentration of indomethacin in the lipid formualitons from a solution to a suspension led to a linear increase in the concentration of indomethacin attained in the aqueous digestion phase from lipid formulations. This study also implied that adverse effects of the lipolysis rate and extent on drug absorption were could be taken into consideration when screening lipid formulations. Lipid suspensions likely had better enhancement of drug absorption. Last, this study demonstrated that a potential basis for optimizing and assessing type Ⅰ lipid formulations and also researching in vivo - in vitro correlations of lipid formulations were provided by an in vitro lipolysis model.