Synthesis and druggability study of triptolide stearate
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摘要: 目的 合成一种雷公藤甲素脂溶性前药,以期提高其制剂的成药性。 方法 以4-二甲氨基吡啶(DMAP)催化的酸与醇的DCC缩合法,合成雷公藤甲素-硬脂酸酯(TP-SA),通过质谱、核磁共振氢谱和碳谱进行结构确认;采用摇瓶法测定化合物油-水分配系数;将TP及TP-SA制备成脂质体及脂肪乳,考察其初步稳定性。 结果 实验结果证明:成功合成TP-SA。TP-SA的log P为2.33。相同处方条件下,TP难以制备成脂质体和乳剂;TP-SA制备成脂质体粒径约90 nm,制备成脂肪乳粒径约110 nm,包封率均大于95%;4℃及25℃条件下观察TP-SA脂质体和脂肪乳的放置稳定性,1周内粒径、包封率等制剂参数皆无明显变化。 结论 TP-SA显著改善药物制剂成药性,本研究可为TP制剂开发提供参考。Abstract: Objective To synthesize a lipophilic prodrug of triptolide (TP) and improve its druggability. Methods Triptolide stearate (TP-SA) was synthesized via the DMAP-catalyzed DCC method and identified by MS, 1H-NMR and 13C-NMR. The shake-flask method was used to study the oil/water partition coefficient. The preparations of TP and TP-SA liposomes and emulsions were compared. Their encapsulation efficiency and stability were investigated. Results TP-SA was synthesized successfully. Its log P in octanol/water system was 2.33. It was difficult to prepare TP liposome or emulsion. By contrast, TP-SA liposome and emulsion can be prepared successfully with the same formulation process. The particle size of TP-SA liposomes were about 90 nm and TP-SA emulsions were about 110 nm. The encapsulation efficiency was above 95%. Their stability were studied at 4℃ and 25℃. The preparation parameters, such as particle size and encapsulation efficiency, had no significant change in a week. Conclusion Triptolide stearate enhanced drug lipophilicity. Its druggability was improved significantly. These data can be used for the TP related drug design and development.
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Key words:
- triptolide stearate /
- prodrug /
- liposome /
- emulsion /
- druggability /
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