Recognition of Free Tryptophan in Water by Synthetic Pseudopeptides: Fluorescence and Thermodynamic Studies
作者:Vicente Martí-Centelles、M. Angeles Izquierdo、M. Isabel Burguete、Francisco Galindo、Santiago V. Luis
DOI:10.1002/chem.201304851
日期:2014.6.10
prepared and their fluorescence response to a series of amino acids was measured in water. Free amino acids, not protected either at the C or the N terminus, were used for this purpose. The prepared receptors display a selective response to tryptophan (Trp) versus the other assayed amino acids under acidic conditions. The macrocyclic nature of the receptor is important as the fluorescence quenching is higher
已经制备了含有an啶单元的伪肽受体,并在水中测量了它们对一系列氨基酸的荧光响应。为此目的,在C或N末端均未保护的游离氨基酸被使用。相对于其他测定的氨基酸,在酸性条件下,制备的受体对色氨酸(Trp)表现出选择性反应。受体的大环性质非常重要,因为大环化合物的荧光猝灭性高于相关的开链受体。值得注意的是,在所用的实验酸性条件下,受体和客体均被完全质子化并带正电;因此,实验结果表明,超分子物质的形成包含两个带正电的有机分子成分,它们通过芳香族-芳香族相互作用和一组复杂的阳离子-阴离子-阳离子相互作用而稳定化。对Trp的选择性似乎是基于单电荷氨基酸的吲哚环与受体三重化形式的cri啶片段之间的牢固联系,该联系的建立是由于阳离子部分与硫酸氢根阴离子。