Ruta Joséphine, Ravelet Corinne, Désiré Jérôme, Décout Jean-Luc, Peyrin Eric
Département de Pharmacochimie Moléculaire UMR 5063, Institut de Chimie Moléculaire de Grenoble FR 2607, Université Joseph Fourier-CNRS, 3804, Grenoble, France.
Anal Bioanal Chem. 2008 Feb;390(4):1051-7. doi: 10.1007/s00216-007-1552-0. Epub 2007 Sep 26.
In this work, a target-specific aptamer chiral stationary phase (CSP) based on the oligonucleotidic selector binding to silica particles through a covalent linkage was developed. An anti-D-adenosine aptamer was coupled, using an in-situ method, by way of an amide bond to macroporous carboxylic acid based silica. Frontal chromatography analysis was performed to evaluate the column properties, i.e., determination of the stationary phase binding capacity and the dissociation constant of the target-immobilized aptamer complex. It was found that such covalent immobilization was able to maintain the aptamer binding properties at a convenient level for an efficient enantioseparation. Subsequently, the separation of adenosine enantiomers was investigated under different operating conditions, including changes in the eluent's ionic strength and the proportion of organic modifiers as well as column temperatures. It was demonstrated that, under various conditions of use and storage, the present CSP was stable over time.
