title: Aptamer-modified micellar electrokinetic chromatography for the enantioseparation of nucleotides.
abstract: In this paper, a new aptamer-based capillary electrophoresis (CE) method, which was able to separate the enantiomers of an anionic target (adenosine monophosphate, AMP) displaying the same electrophoretic mobility as that of the oligonucleotidic chiral selector, is reported. The design of the aptamer-modified micellar electrokinetic chromatography (MEKC) mode consisted of nonionic micelles which acted as a pseudostationary phase and a hydrophobic cholesteryl group-tagged aptamer (Chol-Apt) which partitioned into the uncharged micellar phase. Under partial-filling format and suppressed electroosmotic flow conditions, the strong mobility alteration of Chol-Apt permitted AMP enantiomers to pass through the micelle-anchored aptamer zone and promoted the target enantioseparation. The influence of several electrophoretic parameters (such as concentration and nature of the nonionic surfactant, preincubation of the Chol-Apt and surfactant, capillary temperature, and applied voltage) on the AMP enantiomer migration was investigated in order to define the utilization conditions of the aptamer-modified MEKC mode. The chiral resolution, in a single run, of three adenine nucleotides, i.e., AMP, ADP (adenosine diphosphate), and ATP (adenosine triphosphate), was further accomplished using such methodology. This approach demonstrates the possibility to extend the CE applicability of aptamer chiral selectors to potentially any target, without restriction on its charge-to-mass ratio.
authors.affiliation: Département de Pharmacochimie Moléculaire UMR 5063, Institut de Chimie Moléculaire de Grenoble FR 2607, CNRS-Université Grenoble I (Joseph Fourier), 38041 Grenoble Cedex 9, France.
authors.forename: Josephine
authors.initials: J
authors.lastname: Ruta
authors.forename: Sandrine
authors.initials: S
authors.lastname: Perrier
authors.forename: Corinne
authors.initials: C
authors.lastname: Ravelet
authors.forename: Béatrice
authors.initials: B
authors.lastname: Roy
authors.forename: Christian
authors.initials: C
authors.lastname: Perigaud
authors.forename: Eric
authors.initials: E
authors.lastname: Peyrin
mesh_terms: D000227:Adenine Nucleotides / Q000737:chemistry / Q000302:isolation & purification*; D052157:Aptamers, Nucleotide / Q000138:chemical synthesis / Q000737:chemistry*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D013237:Stereoisomerism; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D000227:Adenine Nucleotides; D052157:Aptamers, Nucleotide; D013501:Surface-Active Agents