Characterization of the molecular packing, thermotropic phase behaviour and critical micellar concentration of a homologous series of N-acyltaurines (n = 9–18). PXRD, DSC and fluorescence spectroscopic studies
作者:Sukanya Arul Prakash、Ravi Kanth Kamlekar
DOI:10.1016/j.chemphyslip.2020.104929
日期:2020.8
properties. We have synthesized a homologous series of NATs with saturated acyl chains (n = 9–18) and investigated their supramolecular structure and thermotropic phase transitions by powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC). The d-spacings obtained from PXRD increase linearly with chain length with an increment of ∼0.847 Å per additional CH2 moiety suggesting that
N-酰基牛磺酸(NAT)是可以与内源性大麻素在结构上相关的脂肪酸酰胺。它们显示出有趣的生理和药理特性。我们合成了具有饱和酰基链(n = 9-18)的一系列NAT,并通过粉末X射线衍射(PXRD)和差示扫描量热法(DSC)研究了它们的超分子结构和热致相变。从PXRD获得的d间隔随链长线性增加,每增加CH 2部分约增加0.847Å,这表明NAT采用倾斜的双层结构,在晶格中堆积相似。DSC研究得出的结果表明吸热转变温度(T t)的NATs显示随着酰基链长度的增加而逐渐增加的趋势。跃迁的焓(ΔH t)和熵(ΔS t)表现出奇数-偶数交替,其中奇数链化合物的值高于偶数链化合物。通过监测8-苯胺基萘-1-磺酸(ANS)的光谱变化,通过荧光光谱法在室温下测定水中NAT的临界胶束浓度(CMC)。发现NAT的CMC随着酰基链长度的增加而降低。本研究结果为研究NAT与其他膜脂和蛋白质的相互作用提供了热力学和结