醋酸曲普瑞林缓释微球体外加速释放及体内外相关性研究

目的 建立体内外相关性良好的醋酸曲普瑞林缓释微球体外加速释放方法.方法 残留法测定该药微球在大鼠体内的释放行为;分别考察表面活性剂、pH值、乙醇浓度、温度、转速和防腐剂浓度对体外加速释放的影响,调整释放条件并建立加速释放方法,进行体内外相关性研究.结果 确定体外加速释放条件为:以15%乙醇溶液(含0.06%吐温80和0.1%苯扎氯铵)为释放介质,释放温度为55℃,振摇频率为200 r/min;在此条件下该药微球30 h释放达到87.35%,相当于微球在体内释放30 d,且体外加速释放结果与体内释放数据相关性良好(y=0.8845x+12.4510,R2=0.9938).结论 所建立的醋酸曲普瑞林微球体外加速释放方法与体内释放行为相关性良好,采用此法可快速有效评价该药微球释放行为.

In vitro accelerated release of triptorelin acetate microspheres and the in vivo/in vitro correlation

Objective To establish an in vitro accelerated release method of triptorelin acetate microspheres with good in vi-tro/in vivo correlation(IVIVC). Methods The in vivo release of triptorelin acetate from microspheres was obtained by residual method in rats. Influences of pH value,concentration of ethanol,temperature,rotation speed and concentration of antiseptic on the in vitro accel-erated release were studied,then the correlation between in vitro accelerated release and in vivo release of the microspheres was estab-lished by adjusting the release conditions. Results The in vitro accelerated release medium of triptorelin acetate microspheres composed of 15%ethanol solution(containing 0.06%Tween 80 and 0.1%benzalkonium chloride)at 55℃with rotating rate of 200 r/min. The cumulative release of triptorelin acetate from microspheres was 87.35%at 30 h under accelerated release condition,equivalent to in vivo release for 30 days. The established in vitro accelerated release had a good correlation with that of in vivo(y=0.8845x+12.4510, R2=0.9938). Conclusion The in vitro accelerated release of triptorelin acetate microspheres could correlate well with in vivo release and has a potential application in rapid and effective evaluation of triptorelin acetate microspheres.