Sodium and potassium salts of bumetanide trihydrate: Impact of counterion on structure, aqueous solubility and dehydration kinetics
作者:Winston Ong、Eugene Y. Cheung、Karen A. Schultz、Cartney Smith、James Bourassa、Magali B. Hickey
DOI:10.1039/c2ce06631a
日期:——
bumetanide potassium trihydrate that is structurally similar to bumetanide sodium trihydrate was identified. Structural analysis indicated however that the change from sodium to potassium salt resulted in meaningful changes in the packing arrangement and even greater changes on physicochemical properties. The potassium trihydrate salt was five times more soluble in water relative to the sodium trihydrate
确定了一种形式的布美他尼三水合钾盐,其结构与布美他尼三水合钠相似。结构分析表明,从钠盐到钾盐的变化导致填料排列发生了有意义的变化,甚至在物理化学性质上发生了更大的变化。三水合钾盐在水中的溶解度是三水合钠盐的五倍(27 mg mL -1对5.6 mg mL -1)。在暴露于低湿度或高温下后,两种盐都完全脱水成其相应的无水形式。与三水钠(14.9 kcal mol -1相对于19.9 kcal mol -1),脱水速率相差15-20倍。这样的5.0kcal mol -1的间隙表明,与三水合钾相比,H 2 O分子在三水合钠中的结合更紧密。溶解度和脱水速率的这些差异进一步说明,化学成分的变化可能会对紧密相关的药用盐形式的物理化学性质产生有意义且不可预测的影响。