盐酸米托蒽醌传递体的包结机理研究

探寻盐酸米托蒽醌-卵磷脂相互作用机理以解释其传递体的相关特性。用薄膜法制备盐酸米托蒽醌传递体并对其制剂学性质进行研究;用紫外-可见光分光光度法、载药传递体与空白传递体的δ-电位的变化、探针扫描显微镜、差示热分析法以及测定体外释药特性等实验手段研究盐酸米托蒽醌传递体中盐酸米托蒽醌的作用位置、作用方式及对传递体结构、体外释药特性的影响。紫外-可见光扫描图谱显示盐酸米托蒽醌与传递体的作用方式为镶嵌方式,盐酸米托蒽醌的蒽醌母核嵌入卵磷脂双分子层的亲油基部分,激光散射测定δ-电位表明盐酸米托蒽醌的烃氨基侧链与磷酸基团之间产生的静电吸引,使带负电的载药传递体的δ-电位绝对值小于空白传递体;探针扫描显微镜测定结果再次证实盐酸米托蒽醌与传递体的作用方式为镶嵌方式,故盐酸米托蒽醌传递体包封率高,缓释作用明显,稳定性增加

Structure Charateristics of Mitoxantrone Transforsomes

This study sought to clarify the molecular location and the interaction between mitoxantrone and mitoxantrone transforsomes. The anthraquinone of mitoxantrone, a heterocyclic ring that intercalates in the lipid of bilayer,was determined by UV-spectrophotometry and electron probes scan microscopy. Two aminoethylamino side-chains of the drugs fit to the phosphates of lecithin were determined by a-value, thus the interaction with lecithin was substantiated. Differential scanning calorimetry confirmed that mitoxantrone has remarkable stabilizing effect on the mitoxantrone transforsomes membrane. The mitoxantrone binds tightly to lecithin. So a high degree of encapsulation efficiency and the sustained-release character of mitoxantrone transforsomes are verified.