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Artículo

Measurements of association constants between enantiomers and chiral selectors by capillary gas chromatography. Theoretical and practical considerations

Lebed, Pablo JorgeIcon ; Keunchkarian, SoniaIcon ; Osorio Grisales, JaiverIcon ; Castells, Cecilia Beatriz MartaIcon
Fecha de publicación: 01/2014
Editorial: Elsevier Science
Revista: Journal Of Chromatography - A
ISSN: 0021-9673
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Química Analítica

Resumen

The association constants of several volatile enantiomers with octakis(3-O-butanoyl-2,6-di-O-pentyl)-γ-cyclodextrin at temperatures between 50 and 100 °C were measured by gas–liquid chromatography using capillary columns coated with different amounts of chiral selector dissolved in polysiloxane OV-1701 and prepared with a precisely determined phase ratio. Simple expressions were deduced to estimate the apparent distribution constants from accurate hold-up and retention times along with that known phase ratio at each temperature. The enantiomer-chiral selector association constants were then calculated from the linear regression of the apparent constants as a function of the chiral selector concentration. One aim of this study consisted in discussing all the experimental uncertainties inherent in the determination of enantiomer/selector association constants with chiral analytes, and how these fundamental measurements can be performed precisely without resorting to the use of reference solutes.
Palabras clave: Chiral Gas-Liquid Chromatography , Association Constants , Capillary Columns , Octakis(3-O-Butanoyl-2,6-Di-O-Pentyl)-Γ-Cyclodextrin
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/11177
DOI: http://dx.doi.org/10.1016/j.chroma.2013.11.007
URL: http://www.sciencedirect.com/science/article/pii/S0021967313017627
Colecciones
Articulos(CIDEPINT)
Articulos de CENTRO DE INV EN TECNOLOGIA DE PINTURAS (I)
Citación
Lebed, Pablo Jorge; Keunchkarian, Sonia; Osorio Grisales, Jaiver; Castells, Cecilia Beatriz Marta; Measurements of association constants between enantiomers and chiral selectors by capillary gas chromatography. Theoretical and practical considerations; Elsevier Science; Journal Of Chromatography - A; 1324; 1-2014; 198-206
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