The bronchodilator drug theophylline (THP), though a BCS class-I drug, is considered as a representative compound to prepare variable stoichiometry cocrystals with isomeric aminobenzoic acids (o-ABA, m-ABA, and p-ABA) as coformers. Cocrystals are synthesized using crystal engineering principles through liquid-assisted mechanochemical grinding. Four different stoichiometry cocrystals of THP are isolated with o-ABA. Coformers m-ABA and p-ABA afforded only 1:1 cocrystals irrespective of crystallization media and different starting materials ratios. All cocrystal materials were subjected to aqueous solubility and diffusion/membrane permeability to examine drug biopharmaceutic properties to predict the in vivo performance of the drug. They exhibited different but improved solubility and modulated diffusion/membrane permeability when compared with pure THP. The interplay of drug solubility and membrane permeability that predicts the overall bioavailability is emphasized based on hydrogen bond synthons and solute···solvent interactions. Hirshfeld surface analysis was carried out in all cases to determine whether a correlation exists between permeability and drug–coformer interactions.
支气管扩张药茶碱(THP)虽然是一种 BCS I 类药物,但被视为一种代表性化合物,用于制备以异构
氨基
苯甲酸(o-ABA、m-ABA 和 p-ABA)为共形剂的可变
化学计量共晶体。共晶体是利用晶体工程原理,通过液体辅助机械
化学研磨合成的。分离出四种不同
化学计量的 THP 与 o-ABA 共晶体。无论结晶介质和起始材料的比例如何,共聚物 m-ABA 和 p-ABA 都只能生成 1:1 的共晶体。对所有共晶体材料进行了
水溶性和扩散/膜渗透性测试,以检查药物的
生物药理特性,从而预测药物在体内的表现。与纯 THP 相比,它们的溶解度和扩散/膜渗透性有所改善,但表现不尽相同。基于氢键合子和溶质与溶剂之间的相互作用,药物溶解度和膜渗透性之间的相互作用得到了强调,从而预测了总体
生物利用度。在所有情况下都进行了 Hirshfeld 表面分析,以确定渗透性与药物-制剂相互作用之间是否存在相关性。