Separation of enantiomers of norephedrine by capillary electrophoresis using cyclodextrins as chiral selectors: comparative CE and NMR studies.

Ketevan Lomsadze, Elena Domínguez Vega, Antonio Salgado, Antonio L Crego, Gerhard K E Scriba, Maria Luisa Marina, Bezhan Chankvetadze

Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia.

Electrophoresis 2012 Jun

filter terms:

In this study, the enantiomer migration order (EMO) of norephedrine (NEP) in the presence of various CDs was investigated by CE. NMR and CE techniques were used to analyze the mechanism of the chiral recognition between NEP enantiomers and four CDs, i.e., native α-CD, β-CD, heptakis(2,3-di-O-acetyl-6-O-sulfo)-β-CD (HDAS-β-CD), and heptakis(2,3-di-O-methyl-6-O-sulfo)-β-CD (HDMS-β-CD). EMO was reversed in the presence of α-CD and β-CD, although only minor differences in the structures of the complexes formed between NEP and these CDs could be derived from rotating frame nuclear Overhauser experiments (ROESY). The complexes between the enantiomers of NEP and the sulfated CDs, HDMS-β-CD, and HDAS-β-CD, were substantially different. However, EMO of NEP was identical in the presence of these CDs. HDAS-β-CD proved to be the most suitable chiral selector for the CE enantioseparation of NEP. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Citation

Ketevan Lomsadze, Elena Domínguez Vega, Antonio Salgado, Antonio L Crego, Gerhard K E Scriba, Maria Luisa Marina, Bezhan Chankvetadze. Separation of enantiomers of norephedrine by capillary electrophoresis using cyclodextrins as chiral selectors: comparative CE and NMR studies. Electrophoresis. 2012 Jun;33(11):1637-47