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Journal of Liquid Chromatography & Related Technologies Volume 23, 2000 - Issue 19
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Original Articles

INFLUENCE OF TEMPERATURE ON ENANTIOSEPARATION EMPLOYING AN AMYLOSE-DERIVATIVE STATIONARY PHASE

Masato Kazusaki Department of Chemical Analysis, Pharmaceutical Research Laboratories, Dainippon Pharmaceutical Co., Ltd., 5-51, Ebie 1-chome, Fukushima-ku, Osaka, 553-0001, Japan
,
Hirofumi Kawabata Department of Chemical Analysis, Pharmaceutical Research Laboratories, Dainippon Pharmaceutical Co., Ltd., 5-51, Ebie 1-chome, Fukushima-ku, Osaka, 553-0001, Japan
&
Hayashi Matsukura Department of Chemical Analysis, Pharmaceutical Research Laboratories, Dainippon Pharmaceutical Co., Ltd., 5-51, Ebie 1-chome, Fukushima-ku, Osaka, 553-0001, Japan
Pages 2937-2946 | Received 01 Feb 2000, Accepted 18 May 2000, Published online: 06 Feb 2007
 
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Abstract

In reversed-phase mode, chromatographic retention is investigated thermodynamically for an enantiomeric pair on an amylose-derivative bonded phase. Ehthalpies and entropies of solute transfer (mobile to stationary phase) are calculated from retention data by evaluation of van't Hoff plots.

Conformational change of the stationary phase is observed at about 20°C. The enantioselectivity is exclusively driven by enthalpy above about 20°C, whereas below about 20°C enantioseparation was achieved by the combination of enthalpy and entropy. The inclusion process of the enantiomer, retained stronger on the stationary phase, plays a important role for chiral recognition on the amylose-derived stationary phase.

Acknowledgments

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