摘要
本文选取非诺贝特为模型药物,乙基纤维素为缓释材料,黄原胶作为调释剂,通过热熔挤出技术将介孔二氧化硅递药系统与缓控释技术结合,制备介孔二氧化硅/乙基纤维素缓释骨架,介孔二氧化硅SBA-15作为药物载体用以提高非诺贝特体外溶出速率。采用水热法合成SBA-15,以扫描电镜、透射电镜、N2吸附-脱吸附及小角衍射对其结构进行表征,结果显示,合成的SBA-15具有有序二维六方介孔结构以及较大比表面积、孔容和孔径。X射线衍射和差示扫描量热结果表明,非诺贝特经SBA-15吸附后以无定形或分子态存在,药物溶出速率明显提高。缓释骨架中药物释放受乙基纤维素黏度和黄原胶含量的影响。22%黄原胶含量的缓释骨架具有较好的缓释效果,体外释放呈一级动力学特征,以不规则释放为主。
Hot-melt extrusion was applied to prepare mesoporous silica/ethylcellulose mini-matrix for sustained release, and fenofibrate was used as a model drug, ethylcellulose and xanthan gum were chosen as sustained-release agent and releasing moderator, respectively. This novel matrix obtained the controlled release ability by combining mesoporous silica drug delivery system and hot-melt extrusion technology. And mesoporous silica particle（SBA-15） was chosen as drug carrier to increase the dissolution rate of fenofibrate in this martix. Scanning electron microscope, transmission electron microscope, small angle X-ray powder diffraction and N2 adsorption-desorption were introduced to determine the particle morphology, particle size and pore structure of the synthesized SBA-15. The results showed that SBA-15 had a very high Brunauer-Emmett- Teller specific surface area, a narrow pore size distribution, large pore volume and a ordered two-dimensional hexagonal structure of p6 mm symmetry. Differential scanning calorimetry and X-ray powder diffraction results demonstrated that fenofibrate dispersed in an amorphous state inside the pores of the mesoporous silica which contributed to the improvement in the dissolution rate. The drug release of mini-matrices was influenced by ethylcellulose viscosity grades and xanthan gum concentration, which increased with the increasing of xanthan gum concentration and decreasing of ethylcellulose viscosity. Mini-matrix containing 22% xanthan gum exhibited a good sustained release performance, and the drug release behavior followed the first-order kinetics.
出处
《药学学报》
CAS
CSCD
北大核心
2015年第4期492-499,共8页
Acta Pharmaceutica Sinica
基金
国家自然科学基金资助项目(81473155)
