对氙具有前所未有的亲和力的水溶性隐窝芳烃：作为基于核磁共振的生物传感器的候选物。

Water soluble cryptophanes showing unprecedented affinity for xenon: candidates as NMR-based biosensors.

作者信息

Huber Gaspard, Brotin Thierry, Dubois Lionel, Desvaux Hervé, Dutasta Jean-Pierre, Berthault Patrick

机构信息

Laboratoire Structure et Dynamique par Résonance Magnétique, DSM/DRECAM/Service de Chimie Moléculaire, URA CEA/CNRS 331, CEA/Saclay, F-91191 Gif sur Yvette, France.

出版信息

J Am Chem Soc. 2006 May 10;128(18):6239-46. doi: 10.1021/ja060266r.

DOI:10.1021/ja060266r

PMID:16669694

Abstract

Cryptophanes bearing OCH(2)COOH groups in place of the methoxy groups represent a new class of xenon-carrier molecules soluble in water at biological pH. By using (1)H and (129)Xe NMR (thermally- and laser-polarized dissolved gas), the structural and dynamical behaviors of these host molecules as well as their interaction with xenon are studied. They are shown to exist in aqueous solution under different conformations in very slow exchange. A saddle form present for one of these conformations could explain the (1)H NMR spectra. Whereas the cryptophanes in such a conformation are unable to complex xenon, unprecedented high binding constants are found for cryptophanes in the other canonical crown-crown conformation. These host molecules could therefore be valuable candidates for biosensing using (129)Xe MRI.

摘要

用OCH(2)COOH基团取代甲氧基的穴番代表了一类新型的氙载体分子，它们在生理pH值下可溶于水。通过使用(1)H和(129)Xe NMR（热极化和激光极化溶解气体），研究了这些主体分子的结构和动力学行为以及它们与氙的相互作用。结果表明，它们在水溶液中以非常缓慢交换的不同构象存在。其中一种构象中存在的鞍形可以解释(1)H NMR光谱。虽然处于这种构象的穴番无法络合氙，但在另一种典型的冠-冠构象中发现穴番具有前所未有的高结合常数。因此，这些主体分子可能是使用(129)Xe MRI进行生物传感的有价值候选物。