Monomeric Cryptophane with Record-High Xe Affinity Gives Insights into Aggregation-Dependent Sensing
作者:Serge D. Zemerov、Yannan Lin、Ivan J. Dmochowski
DOI:10.1021/acs.analchem.0c03776
日期:2021.1.26
Cryptophane host molecules provide ultrasensitive contrast agents for 129Xe NMR/MRI. To investigate key features of cryptophane–Xe sensing behavior, we designed a novel water-soluble cryptophane with a pendant hydrophobic adamantyl moiety, which has good affinity for a model receptor, beta-cyclodextrin (β-CD). Adamantyl-functionalized cryptophane-A (AFCA) was synthesized and characterized for Xe affinity
Cryptophane 主体分子为129 Xe NMR/MRI提供超灵敏的造影剂。为了研究cryptophane-Xe传感行为的关键特征,我们设计了一种新型水溶性cryptophane,它带有一个疏水性金刚烷基侧基,对模型受体β-环糊精(β-CD)具有良好的亲和力。合成了金刚烷基功能化的cryptophane-A (AFCA),并在不同的AFCA 和β-CD 浓度下对Xe 亲和力、129 Xe NMR 信号和聚集状态进行了表征。Xe-AFCA 缔合常数通过荧光猝灭测定,K A = 114,000 ± 5000 M –1在 293 K,这是报道的对磷酸盐缓冲盐水 (pH 7.2) 中的cryptophane 宿主的最高亲和力。无超极化 (hp)与 AFCA 结合的 Xe 对应的129 Xe NMR 峰在高 (100 μM) AFCA 浓度下直接观察到,其中观察到小的cryptophane 聚集体,并且仅在低