To study the controlled effect of poly （lactic acid） （PLA）, poly lactic-coglycolic （PLGA） and ethylenediamine （EDA）-maleic anhydride （MAH） modified PLA （EMPLA） for in vitro release of nestorone, rods were ...To study the controlled effect of poly （lactic acid） （PLA）, poly lactic-coglycolic （PLGA） and ethylenediamine （EDA）-maleic anhydride （MAH） modified PLA （EMPLA） for in vitro release of nestorone, rods were prepared using the solvent evaporation method. Amount of drug release in vitro was determined by UV spectrophotometry. Effects of rods diameter, the molecular weight of PLA, the drug percentage and the hydrophilicity of polymers on the release of biodegradable nestorone rods in vitro were investigated. It is indicated that the controlled effect of the biodegradable rods for the release of nestorone in vitro is good. The amount of drug released every week from rods in different diameter is similar to one another. The amount of drug released every week and the accumulative drug released during 12 week were almost in direct proportion with the drug percentage of the rods. The amount of drug released every week is increased as the decreasing of PLA molecular weight. As the hydrophlicity of polymer is improved, the rate of drug release every week is accelerated. The studies show that the plausibility of controlled release of nestorone from PLA, PLGA and EMPLA rods imply the possibility of their application as a controlled delivery system for nestorone. The results show that the greater the molecular weight of PLA is, the slower its degradation is and the slower the drug released; the greater the percentage of nestorone is, the more quickly the drug release. An increase of the hydrophilicity of the polymers will increase their degradation rate and leads to a fast drug release. Anyhow, these rods systems should be further evaluated in vivo.展开更多
目的:研制烯诺孕酮阴道环并建立其体外释放度的检测方法,考察其体外释放情况。方法:以硅橡胶为载体,采用注塑成型法,制备基质型阴道环;以基质型阴道环为药芯,包覆一定厚度的无活性硅橡胶膜,制得储库型阴道环。采用溶出度桨法的装置进行...目的:研制烯诺孕酮阴道环并建立其体外释放度的检测方法,考察其体外释放情况。方法:以硅橡胶为载体,采用注塑成型法,制备基质型阴道环;以基质型阴道环为药芯,包覆一定厚度的无活性硅橡胶膜,制得储库型阴道环。采用溶出度桨法的装置进行体外释放实验,以p H 4. 0的醋酸缓冲液200 m L为释放介质,转速为50 r·min-1,温度为(37±0. 5)℃,含量检测方法为高效液相色谱法(HPLC),检测条件为色谱柱DiamonsilC18(2)(250 mm×4. 6 mm,5μm);流动相甲醇-水(70∶30,v/v);检测波长243 nm;流速1 m L·min-1;进样量20μL;柱温35℃,并对烯诺孕酮阴道环的体外释放度进行释放拟合。结果:优化了烯诺孕酮阴道环制备工艺及处方,阴道环中药物可以维持21 d缓慢释放,基质型阴道环的释药速率符合Higuchi方程,储库型阴道环的释药速率更加平稳。所建立的烯诺孕酮阴道环体外释放方法能够检测样品的体外释放度。结论:烯诺孕酮阴道环具有良好的释药特性,制备工艺稳定;所建立的释放度测定方法准确、可靠、灵敏,可用于烯诺孕酮阴道环体外释放度的测定。展开更多
文摘To study the controlled effect of poly （lactic acid） （PLA）, poly lactic-coglycolic （PLGA） and ethylenediamine （EDA）-maleic anhydride （MAH） modified PLA （EMPLA） for in vitro release of nestorone, rods were prepared using the solvent evaporation method. Amount of drug release in vitro was determined by UV spectrophotometry. Effects of rods diameter, the molecular weight of PLA, the drug percentage and the hydrophilicity of polymers on the release of biodegradable nestorone rods in vitro were investigated. It is indicated that the controlled effect of the biodegradable rods for the release of nestorone in vitro is good. The amount of drug released every week from rods in different diameter is similar to one another. The amount of drug released every week and the accumulative drug released during 12 week were almost in direct proportion with the drug percentage of the rods. The amount of drug released every week is increased as the decreasing of PLA molecular weight. As the hydrophlicity of polymer is improved, the rate of drug release every week is accelerated. The studies show that the plausibility of controlled release of nestorone from PLA, PLGA and EMPLA rods imply the possibility of their application as a controlled delivery system for nestorone. The results show that the greater the molecular weight of PLA is, the slower its degradation is and the slower the drug released; the greater the percentage of nestorone is, the more quickly the drug release. An increase of the hydrophilicity of the polymers will increase their degradation rate and leads to a fast drug release. Anyhow, these rods systems should be further evaluated in vivo.
文摘目的:研制烯诺孕酮阴道环并建立其体外释放度的检测方法,考察其体外释放情况。方法:以硅橡胶为载体,采用注塑成型法,制备基质型阴道环;以基质型阴道环为药芯,包覆一定厚度的无活性硅橡胶膜,制得储库型阴道环。采用溶出度桨法的装置进行体外释放实验,以p H 4. 0的醋酸缓冲液200 m L为释放介质,转速为50 r·min-1,温度为(37±0. 5)℃,含量检测方法为高效液相色谱法(HPLC),检测条件为色谱柱DiamonsilC18(2)(250 mm×4. 6 mm,5μm);流动相甲醇-水(70∶30,v/v);检测波长243 nm;流速1 m L·min-1;进样量20μL;柱温35℃,并对烯诺孕酮阴道环的体外释放度进行释放拟合。结果:优化了烯诺孕酮阴道环制备工艺及处方,阴道环中药物可以维持21 d缓慢释放,基质型阴道环的释药速率符合Higuchi方程,储库型阴道环的释药速率更加平稳。所建立的烯诺孕酮阴道环体外释放方法能够检测样品的体外释放度。结论:烯诺孕酮阴道环具有良好的释药特性,制备工艺稳定;所建立的释放度测定方法准确、可靠、灵敏,可用于烯诺孕酮阴道环体外释放度的测定。
