Polymorphism of Triamcinolone Acetonide Acetate and Its Implication for the Morphology Stability of the Finished Drug Product
作者:Jian-Rong Wang、Bingqing Zhu、Zaiyong Zhang、Junjie Bao、Gaojin Deng、Qiaoce Ding、Xuefeng Mei
DOI:10.1021/acs.cgd.7b00453
日期:2017.6.7
Triamcinolone acetonide acetate (TAA) is a widely applied drug for rheumatoid arthritis and for the treatment of chronic inflammatory diseases. The drug was marketed as an injectable suspension with very low aqueous solubility. It was found that significant changes in crystal form, particle size, and morphology were observed during the shelf life period, which resulted in product lot failure and recall. TAA was thus an interesting subject for polymorphism screening and led to the discovery of multiple solid modifications, including three polymorphs (A, B, and C) and a monohydrate. These forms were fully characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, dynamic vapor sorption, and zeta potential. Single-crystal structures of four different forms and the transformation pathways among different modifications were discussed in detail. Single-crystal-to-single-crystal transformation behaviors were also analyzed and monitored by variable temperature-powder X-ray diffraction and hot stage microscopy. Morphological stability, form change, and particle size in suspension were also closely monitored, and the data were compared with the marketed product. It was found that crystal form selection plays a critical role in the stability of the injectable suspension products. The results indicate that form B has better physical stability in 0.5% NaCMC aqueous suspension compared to that of the currently marketed form.
醋酸曲安奈德(TAA)是一种广泛用于治疗类风湿性关节炎和慢性炎症性疾病的药物。该药物作为注射用混悬液上市,水溶性极低。研究发现,在保质期内,晶体形态、粒度和形貌发生了明显变化,导致产品批次失效和召回。因此,TAA 是一个有趣的多晶型筛选对象,并由此发现了多种固体变体,包括三种多晶型(A、B 和 C)和一种一水合物。粉末 X 射线衍射、傅立叶变换红外光谱、热重分析、差示扫描量热仪、扫描电子显微镜、动态蒸汽吸附和 zeta 电位对这些形态进行了全面表征。详细讨论了四种不同形态的单晶结构以及不同改性之间的转化途径。此外,还通过变温粉末 X 射线衍射和热台显微镜分析和监测了单晶到单晶的转变行为。此外,还对悬浮液中的形态稳定性、形态变化和粒度进行了密切监测,并将这些数据与市场上的产品进行了比较。研究发现,晶型选择对注射用悬浮剂产品的稳定性起着关键作用。结果表明,在 0.5% NaCMC 水悬浮液中,B 型的物理稳定性优于目前上市的 B 型。