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首页> 外文期刊>Crystal growth & design >Crystallization of Eflucimibe Drug in a Solvent Mixture:Effects of Process Conditions on Polymorphism
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Crystallization of Eflucimibe Drug in a Solvent Mixture:Effects of Process Conditions on Polymorphism

机译:Eflucimibe药物在溶剂混合物中的结晶:工艺条件对多态性的影响

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摘要

Nucleation and metastability of the eflucimibe (S)-2',3',5'-trimethyl-4'-hydroxy-dodecylthiophenyl-acetanilide,a new acyl-coenzyme A:cholesterol O-acyltransferase (ACAT) inhibitor,have been investigated according to a polythermal method.Eflucimibe exhibits two polymorphs,A and B,which crystallize simultaneously (concomitant polymorphs).The focus of this study was on the effect of the cooling rate,the initial concentration,and the seeds on metastability and polymorphism of eflucimibe.For nonseeded crystallization,it was found that the metastable zone width is large (primary nucleation) and fulfills well the linear relation between log DELTAT_(max) and log(dT/dt).In addition,the X-ray powder diffraction and differential scanning calorimetry analyses of the powder obtained show that the desired polymorph (pure A form) is difficult to obtain.On the contrary,for seeded experiments,the metastable zone width is significantly reduced (secondary nucleation) and the occurrence of polymorphism is controlled by seeding with the desired polymorph.
机译:研究了一种新型的酰基辅酶A:胆固醇O-酰基转移酶(ACAT)抑制剂eflucimibe(S)-2',3',5'-三甲基-4'-羟基十二烷基硫代苯基乙酰胺的成核作用和亚稳态。 Eflucimibe表现出两个多晶型物A和B,它们同时结晶(伴随的多晶型物)。本研究的重点是冷却速率,初始浓度和种子对eflucimibe的亚稳性和多态性的影响。对于非种子结晶,发现亚稳态区宽度较大(一次成核),并很好地满足log DELTAT_(max)和log(dT / dt)之间的线性关系。此外,X射线粉末衍射和差示扫描所获得粉末的量热分析表明,难以获得所需的多晶型物(纯A形式)。相反,对于种子实验,亚稳态区的宽度显着减小(二次成核),并且发生了多晶型。通过播种所需的多晶型来控制。

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