Identification of novel adefovir dipivoxil-saccharin cocrystal polymorphs and their thermodynamic polymorphic transformations
作者:Kun Ma、Ningning Wang、Linfeng Cheng、Yuanfeng Wei、Jianjun Zhang、Yuan Gao、Shuai Qian
DOI:10.1016/j.ijpharm.2019.05.071
日期:2019.7
the heating process on DSC, forms I and II underwent solid-solid transformations to form III with endothermic transition peaks, suggesting that forms I and II were enantiotropically related to form III. Furthermore, slurry conversion experiments in ethanol showed forms II and III would quickly convert to form I by solution-mediated transformation, indicating that form I was the most stable form among
本文制备了两种新型阿德福韦酯-糖精 (AD-SAC) 共晶多晶型物,即晶型 II 和 III,并通过 PXRD、DSC、FT-IR 和 SEM 进行了表征。还研究了这两种形式和已知形式(形式I)的多晶型转化。与晶型I相比,晶型II和III的AD-SAC共晶在DSC上、PXRD上的特征衍射峰和FT-IR上的吸收光谱上表现出不同的热行为。此外,晶型I呈现不规则的板状形状,而晶型II和III分别呈现针状形状和粗短柱状形状。在 DSC 加热过程中,晶型 I 和 II 经历固-固转变,形成具有吸热转变峰的晶型 III,这表明晶型 I 和 II 与晶型 III 具有对映异构关系。此外,乙醇中的浆液转化实验表明,晶型II和III会通过溶液介导的转化快速转化为晶型I,这表明晶型I是AD-SAC共晶的三种晶型中在15至50℃下最稳定的晶型。