"Click" immobilized perphenylcarbamated and permethylated cyclodextrin stationary phases for chiral high-performance liquid chromatography application
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Young, David J
Tan, Timothy Thatt Yang
Ng, Siu-Choon
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Abstract
Two cyclodextrin-based chiral stationary phases have been prepared by immobilization of functionalized mono-6-azido- -CD derivatives to alkynyl modified silica via "click" chemistry and applied to the HPLC enantioseparation of various chiral compounds. The perphenylcarbamatedCDCSP (CCP-CSP) exhibited excellent chiral recognition of a wide range of analytes including racemic aryl alcohols, flavonoids, bendroflumethiazide, atropine and some -blockers. Methanol proved to be a better organic modifier than acetonitrile for most of the analytes with the exception of bendroflumethiazide. The "click" chemistry immobilized permethylated CD CSP (CCM-CSP) afforded poor chiral recognition for most analytes, but could resolve non-aromatic ionone derivatives which were not separated on CCP-CSP. These results suggest that resolution with cyclodextrin derived CSPs depend on a complex interplay of 'host'-'guest' inclusion, hydrogen bonding, - and hydrophobic interactions.
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Journal of Chromatography A
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1217
Issue
31
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Chemical sciences
Separation science
Engineering