Objective To systematically study solvatomorphism of indomethacin and provide a scientific basis for the quality control of the solvated impurities in this drug. Methods By changing the recrystallization solvent, solvent volume, recrystallization temperature, time and pressure, nine solvates and four non-solvated forms were discovered and prepared. The differential scanning calorimetry (DSC), thermogravimetric analysis ( TGA), X-ray powder diffraction ( PXRD) and infrared spectrometry (IR) were introduced for characterization analysis. Furthermore, the test of influencing factors was used to explore the stability of solvate crystal form and the crystal transformation rules among them. Results Nine solvates were prepared, which including two solvates reported for the first time in this work. Results showed that crystal forms of the 9 solvates have different types or proportions of crystal solvents according to the various results of DSC, TGA, PXRD and IR. Moreover, the nine solvates prepared in this work were metastable crystal forms which could be transformed to non-medicinal forms. Conclusion The composition, thermodynamic property and transformation rule of all the solvates are elucidated in this work. In addition, an effective method for qualitative or quantitative analysis of these solvates was established. The standard graphs and data were used as basic data and scientific basis for the solvate control in the manufacturing of indomethacin.%目的：系统研究吲哚美辛溶剂合物的多晶型现象,为该药可能存在的溶剂合物晶型杂质成分的质量控制提供科学依据。方法通过改变重结晶溶剂种类、数量、温度、时间、压力等参数,发现并制备获得9种吲哚美辛溶剂合物晶型和4种非溶剂合物晶型,利用差示扫描量热法(DSC)、热重法(TG)、粉末 X 射线衍射法(PXRD)、红外光谱法(IR)对溶剂合物晶型进行表征分析,通过影响因素实验探索溶剂合物晶型的稳定性及晶型转变规律。结果制备获得9种溶剂合物晶型中的2种为首次发现新晶型物质状态；检测分析结果表明研究吲哚美辛9种溶剂合物晶型均含有不同种类或数量的结晶溶剂,DSC、TG、PXRD、IR 图谱间存在显著差异,9种溶剂合物中均属亚稳定晶型,溶剂合物晶型均向非药用晶型转变。结论阐明吲哚美辛9种溶剂合物晶型的物质组成、热力学稳定性质、晶型转变规律等,建立晶型物质的有效定性或定量分析方法,利用相关技术提供了表征吲哚美辛溶剂合物晶型物质的标准图谱和数据,为吲哚美辛药品中有效控制其各种溶剂合物晶型成分鉴别提供基础数据与科学依据。
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