Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography
- Autores
- Gagliardi, Leonardo Gabriel; Castells, Cecilia Beatriz Marta; Ràfols, Clara; Rosés, Martí; Bosch, Elisabeth
- Año de publicación
- 2006
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In reversed-phase liquid chromatography (RPLC), the retention of weak acids and bases is a sigmoidal function of the mobile-phase pH. Therefore, pH is a key chromatographic variable to optimize retention and selectivity. Furthermore, at an eluent pH close to the pKa of the solute, the dependence of ionization of the buffer and solute on temperature can be used to improve chromatographic separations involving ionizable solutes by an adequate handling of column temperature. In this paper, we derive a general equation for the prediction of the retentive behavior of ionizable compounds upon simultaneous changes in mobile-phase pH and column temperature. Four experiments, two limiting pH values and two temperatures, provide the input data that allow predictions in the whole range of these two variables, based on the thermodynamic fundamentals of the involved equilibria. Also, the study demonstrates the significant role that the choice of the buffer compound would have on selectivity factors in RPLC at temperatures higher than 25 °C. © 2006 American Chemical Society.
Fil: Gagliardi, Leonardo Gabriel. Universidad de Barcelona; España. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; Argentina
Fil: Castells, Cecilia Beatriz Marta. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; Argentina
Fil: Ràfols, Clara. Universidad de Barcelona; España
Fil: Rosés, Martí. Universidad de Barcelona; España
Fil: Bosch, Elisabeth. Universidad de Barcelona; España - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/95500
Ver los metadatos del registro completo
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Modeling retention and selectivity as a function of pH and column temperature in liquid chromatographyGagliardi, Leonardo GabrielCastells, Cecilia Beatriz MartaRàfols, ClaraRosés, MartíBosch, Elisabethhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1In reversed-phase liquid chromatography (RPLC), the retention of weak acids and bases is a sigmoidal function of the mobile-phase pH. Therefore, pH is a key chromatographic variable to optimize retention and selectivity. Furthermore, at an eluent pH close to the pKa of the solute, the dependence of ionization of the buffer and solute on temperature can be used to improve chromatographic separations involving ionizable solutes by an adequate handling of column temperature. In this paper, we derive a general equation for the prediction of the retentive behavior of ionizable compounds upon simultaneous changes in mobile-phase pH and column temperature. Four experiments, two limiting pH values and two temperatures, provide the input data that allow predictions in the whole range of these two variables, based on the thermodynamic fundamentals of the involved equilibria. Also, the study demonstrates the significant role that the choice of the buffer compound would have on selectivity factors in RPLC at temperatures higher than 25 °C. © 2006 American Chemical Society.Fil: Gagliardi, Leonardo Gabriel. Universidad de Barcelona; España. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; ArgentinaFil: Castells, Cecilia Beatriz Marta. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; ArgentinaFil: Ràfols, Clara. Universidad de Barcelona; EspañaFil: Rosés, Martí. Universidad de Barcelona; EspañaFil: Bosch, Elisabeth. Universidad de Barcelona; EspañaAmerican Chemical Society2006-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/95500Gagliardi, Leonardo Gabriel; Castells, Cecilia Beatriz Marta; Ràfols, Clara; Rosés, Martí; Bosch, Elisabeth; Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography; American Chemical Society; Analytical Chemistry; 78; 16; 8-2006; 5858-58670003-2700CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/abs/10.1021/ac060482iinfo:eu-repo/semantics/altIdentifier/doi/10.1021/ac060482iinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-06-10T09:43:30Zoai:ri.conicet.gov.ar:11336/95500instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-06-10 09:43:31.28CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| title |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| spellingShingle |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography Gagliardi, Leonardo Gabriel |
| title_short |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| title_full |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| title_fullStr |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| title_full_unstemmed |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| title_sort |
Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography |
| dc.creator.none.fl_str_mv |
Gagliardi, Leonardo Gabriel Castells, Cecilia Beatriz Marta Ràfols, Clara Rosés, Martí Bosch, Elisabeth |
| author |
Gagliardi, Leonardo Gabriel |
| author_facet |
Gagliardi, Leonardo Gabriel Castells, Cecilia Beatriz Marta Ràfols, Clara Rosés, Martí Bosch, Elisabeth |
| author_role |
author |
| author2 |
Castells, Cecilia Beatriz Marta Ràfols, Clara Rosés, Martí Bosch, Elisabeth |
| author2_role |
author author author author |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
In reversed-phase liquid chromatography (RPLC), the retention of weak acids and bases is a sigmoidal function of the mobile-phase pH. Therefore, pH is a key chromatographic variable to optimize retention and selectivity. Furthermore, at an eluent pH close to the pKa of the solute, the dependence of ionization of the buffer and solute on temperature can be used to improve chromatographic separations involving ionizable solutes by an adequate handling of column temperature. In this paper, we derive a general equation for the prediction of the retentive behavior of ionizable compounds upon simultaneous changes in mobile-phase pH and column temperature. Four experiments, two limiting pH values and two temperatures, provide the input data that allow predictions in the whole range of these two variables, based on the thermodynamic fundamentals of the involved equilibria. Also, the study demonstrates the significant role that the choice of the buffer compound would have on selectivity factors in RPLC at temperatures higher than 25 °C. © 2006 American Chemical Society. Fil: Gagliardi, Leonardo Gabriel. Universidad de Barcelona; España. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; Argentina Fil: Castells, Cecilia Beatriz Marta. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; Argentina Fil: Ràfols, Clara. Universidad de Barcelona; España Fil: Rosés, Martí. Universidad de Barcelona; España Fil: Bosch, Elisabeth. Universidad de Barcelona; España |
| description |
In reversed-phase liquid chromatography (RPLC), the retention of weak acids and bases is a sigmoidal function of the mobile-phase pH. Therefore, pH is a key chromatographic variable to optimize retention and selectivity. Furthermore, at an eluent pH close to the pKa of the solute, the dependence of ionization of the buffer and solute on temperature can be used to improve chromatographic separations involving ionizable solutes by an adequate handling of column temperature. In this paper, we derive a general equation for the prediction of the retentive behavior of ionizable compounds upon simultaneous changes in mobile-phase pH and column temperature. Four experiments, two limiting pH values and two temperatures, provide the input data that allow predictions in the whole range of these two variables, based on the thermodynamic fundamentals of the involved equilibria. Also, the study demonstrates the significant role that the choice of the buffer compound would have on selectivity factors in RPLC at temperatures higher than 25 °C. © 2006 American Chemical Society. |
| publishDate |
2006 |
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2006-08 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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http://hdl.handle.net/11336/95500 Gagliardi, Leonardo Gabriel; Castells, Cecilia Beatriz Marta; Ràfols, Clara; Rosés, Martí; Bosch, Elisabeth; Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography; American Chemical Society; Analytical Chemistry; 78; 16; 8-2006; 5858-5867 0003-2700 CONICET Digital CONICET |
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http://hdl.handle.net/11336/95500 |
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Gagliardi, Leonardo Gabriel; Castells, Cecilia Beatriz Marta; Ràfols, Clara; Rosés, Martí; Bosch, Elisabeth; Modeling retention and selectivity as a function of pH and column temperature in liquid chromatography; American Chemical Society; Analytical Chemistry; 78; 16; 8-2006; 5858-5867 0003-2700 CONICET Digital CONICET |
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