Simultaneous Improvement of Epalrestat Photostability and Solubility via Cocrystallization: A Case Study
作者:Okky Dwichandra Putra、Daiki Umeda、Yuda Prasetya Nugraha、Kazuya Nango、Etsuo Yonemochi、Hidehiro Uekusa
DOI:10.1021/acs.cgd.7b01371
日期:2018.1.3
In this study, we attempt to simultaneously improve the photostability and solubility of epalrestat (a drug used for neuropathy treatment) by preparing epalrestat–betaine zwitterionic cocrystals and characterize the physicochemical property alterations accompanying their formation. Notably, we reveal that the strong hydrogen bonds between epalrestat and betaine molecules in the above cocrystals and the reduced size of the reaction cavity around epalrestat molecules prevent the E,Z to Z,Z photoisomerization of the latter, resulting in improved photostability. Furthermore, the prepared cocrystals exhibit a higher solubility and larger dissolution rate than pure epalrestat crystals due to featuring a layered structure with alternately arranged epalrestat and betaine coformer molecules.
在本研究中,我们尝试通过制备依帕司他-甜菜碱两性离子共晶体来同时提高依帕司他(一种用于治疗神经病的药物)的光稳定性和溶解度,并表征其形成过程中物理化学性质的变化。值得注意的是,我们发现上述共晶中依帕司他和甜菜碱分子之间的强氢键以及依帕司他分子周围反应腔尺寸的减小阻止了后者的E,Z到Z,Z光异构化,从而提高了光稳定性。此外,由于具有依帕司他和甜菜碱共形成分子交替排列的层状结构,所制备的共晶体比纯依帕司他晶体表现出更高的溶解度和更大的溶出速率。