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共无定形体系改善低水溶性药物达比加群酯甲磺酸盐和他达拉非的溶出行为及稳定性

Coamorphous combinations of poorly water-soluble drugs dabigatran etexilate mesylate and tadalafil for improving dissolution and physical stability

  • 摘要: 达比加群酯甲磺酸盐(DE)和他达拉非(TD)为低水溶性BCS Ⅱ类药物,本研究通过减压旋蒸法制备DE-TD共无定形,以提高两者溶出度,改善生物利用度。利用X射线粉末衍射法、差量扫描量热分析、傅里叶变换红外光谱、热重分析等手段进行表征,并考察共无定形的溶出行为和稳定性。结果表明,制备获得的DE-TD共无定形物的Tg为119 ℃,红外光谱表明在DE的N-H基团与TD的C==O基团之间可能形成氢键。特性溶出和粉末饱和溶出实验表明,共无定形样品相较于晶体药物可显著改善两种药物的溶出度。DE无定形样品在25 ℃/75%RH恒温恒湿条件下放置10 d即发生转晶,而共无定形样品在25 ℃/60%RH和40℃/75%RH条件下90 d均无转晶现象。

     

    Abstract: 〓 Dabigatran etexilate mesylate(DE)and tadalafil(TD)are BCS class II drugs with poor water solubility. 〓 In this study coamorphization technique was used to improve their solubilities/dissolutions and hence to enhance their oral absorptions. The coamorphous DE-TD were prepared by solvent-evaporation method and characterized by PXRD, DSC, FTIR and TGA. In addition, dissolution behavior and physical stability were also investigated. Only halo pattern and a single Tg of 119 °C was observed on the PXRD and DSC of the co-evaporated product, respectively, indicating the formation of coamorphous DE-TD. FTIR result suggested that a hydrogen bond was probably formed between N-H group of DE and C==O group of TD. In comparison to crystalline counterparts, coamorphous DE-TD showed a significantly improved intrinsic dissolution rate and prolonged supersaturation time in intrinsic dissolution and supersaturation dissolution studies, respectively. No crystallization was observed under affecting factors testing(30 days)as well as long-term and accelerated stability testing(90 days)for the prepared coamorphous DE-TD under 25°C/60%RH or 40°C/75%RH, while amorphous DE crystalized at 10 days under 25 ℃/75% RH.

     

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