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Artículo

Chiral separation of aryloxyphenoxy-propionate herbicides in a permethyl-β-cyclodextrin based column. Influence of temperature and mobile phase composition on enantioselectivity

Lubomirsky, EsterIcon ; Padró, Juan ManuelIcon ; Di Loreto, Héctor; Castells, Cecilia Beatriz MartaIcon
Fecha de publicación: 08/2017
Editorial: Wiley VCH Verlag
Revista: Electrophoresis
ISSN: 0173-0835
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

We used a permethyl-β-cyclodextrin chiral stationary phase under reversed-phase conditions for the chiral separation of four aryloxyphenoxy-propionate herbicides (fenoxaprop-p-ethyl, quizalofop-p-ethyl and tefuryl, and haloxyfop-p-methyl) with mixtures of methanol, ethanol, 2-propanol, n-propanol, tert-butanol, or acetonitrile and water as mobile phases and investigated the influence of mobile phase composition and column temperature (from 0 to 50°C) on the separation. The retention factors (k) and selectivity factors (α) of all the herbicides investigated decreased with increasing temperature. The lnα versus 1/T and lnk versus 1/T plots for the enantiomers of the chiral pesticides were linear within the range of 0–50°C with all alcohol/water mixtures constituting the mobile phase, but the lnk versus 1/T plots were nonlinear for all the enantiomers chromatographed in acetonitrile/water mixtures. The thermodynamic parameters based on linear van't Hoff plots were calculated. The influence of temperature and mobile phase composition on the enantioseparation of the solutes has rarely been considered simultaneously. The temperature and the solvents used in the mobile phase, however, were found to have a profound effect on the enantioseparation of these herbicides.
Palabras clave: Aryloxyphenoxy-Propionate Herbicides , Mobile Phase Composition Effects , Permethyl-Β-Cyclodextrin , Reversed-Phase Liquid Chromatography , Temperature Effects
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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/11336/49682
DOI: http://dx.doi.org/10.1002/elps.201600528
URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/elps.201600528
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
Lubomirsky, Ester; Padró, Juan Manuel; Di Loreto, Héctor; Castells, Cecilia Beatriz Marta; Chiral separation of aryloxyphenoxy-propionate herbicides in a permethyl-β-cyclodextrin based column. Influence of temperature and mobile phase composition on enantioselectivity; Wiley VCH Verlag; Electrophoresis; 38; 15; 8-2017; 1948-1955
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