Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization

Autores
Ramirez, Eduardo Alejandro; Zon, María Alicia; Jara Ulloa, Paola Andrea; Squella, Juan Arturo; Nunez Vergara, Luis; Fernandez, Hector
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study the thermodynamics and kinetics of the adsorption of a redox couple having quinone nature on glassy carbon electrodes. This couple is produced by the anodic oxidation of mycotoxin ochratoxin A in 10% acetonitrile + 90% 1 M HClO4 aqueous solution. The quasi-reversible redox couple was studied by both cyclic (CV) and square wave (SWV) voltammetric techniques. The Frumkin adsorption isotherm best described the specific interaction of the redox couple with carbon electrodes. By fitting the experimental data, we obtained values of −28.4 kJ mol−1 and 0.70 ± 0.02 for the Gibbs free energy of adsorption and the interaction parameter, respectively. SWV fully characterized the thermodynamics and kinetics of the adsorbed redox couple, using a combination of the “quasi-reversible maximum” and the “splitting of SW peaks” methods. Average values of 0.609 ± 0.003 V and 0.45 ± 0.06 were obtained for the formal potential and the anodic transfer coefficient, respectively. Moreover, a formal rate constant of 10.7 s−1 was obtained. SWV was also employed to generate calibration curves. The lowest concentration of mycotoxin was 1.24 × 10−8 M (5 ppb), measured indirectly with a signal to noise ratio of 3:1.
Fil: Ramirez, Eduardo Alejandro. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Zon, María Alicia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Jara Ulloa, Paola Andrea. Universidad de Chile; Chile
Fil: Squella, Juan Arturo. Universidad de Chile; Chile
Fil: Nunez Vergara, Luis. Universidad de Chile; Chile
Fil: Fernandez, Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina
Materia
OCHRATOXIN A
ADSORPTIVE ACCUMULATION
SQUARE WAVE VOLTAMMETRY
THERMODYNAMIC AND KINETICS PARAMETERS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/242105
Acceder
id CONICETDig_1ed5951cac7f471451344d6e40661f53
oai_identifier_str oai:ri.conicet.gov.ar:11336/242105
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterizationRamirez, Eduardo AlejandroZon, María AliciaJara Ulloa, Paola AndreaSquella, Juan ArturoNunez Vergara, LuisFernandez, HectorOCHRATOXIN AADSORPTIVE ACCUMULATIONSQUARE WAVE VOLTAMMETRYTHERMODYNAMIC AND KINETICS PARAMETERShttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1We study the thermodynamics and kinetics of the adsorption of a redox couple having quinone nature on glassy carbon electrodes. This couple is produced by the anodic oxidation of mycotoxin ochratoxin A in 10% acetonitrile + 90% 1 M HClO4 aqueous solution. The quasi-reversible redox couple was studied by both cyclic (CV) and square wave (SWV) voltammetric techniques. The Frumkin adsorption isotherm best described the specific interaction of the redox couple with carbon electrodes. By fitting the experimental data, we obtained values of −28.4 kJ mol−1 and 0.70 ± 0.02 for the Gibbs free energy of adsorption and the interaction parameter, respectively. SWV fully characterized the thermodynamics and kinetics of the adsorbed redox couple, using a combination of the “quasi-reversible maximum” and the “splitting of SW peaks” methods. Average values of 0.609 ± 0.003 V and 0.45 ± 0.06 were obtained for the formal potential and the anodic transfer coefficient, respectively. Moreover, a formal rate constant of 10.7 s−1 was obtained. SWV was also employed to generate calibration curves. The lowest concentration of mycotoxin was 1.24 × 10−8 M (5 ppb), measured indirectly with a signal to noise ratio of 3:1.Fil: Ramirez, Eduardo Alejandro. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Zon, María Alicia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Jara Ulloa, Paola Andrea. Universidad de Chile; ChileFil: Squella, Juan Arturo. Universidad de Chile; ChileFil: Nunez Vergara, Luis. Universidad de Chile; ChileFil: Fernandez, Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; ArgentinaPergamon-Elsevier Science Ltd2010-01info: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/11336/242105Ramirez, Eduardo Alejandro; Zon, María Alicia; Jara Ulloa, Paola Andrea; Squella, Juan Arturo; Nunez Vergara, Luis; et al.; Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 55; 3; 1-2010; 771-7780013-4686CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0013468609011724info:eu-repo/semantics/altIdentifier/doi/10.1016/j.electacta.2009.09.013info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:48Zoai:ri.conicet.gov.ar:11336/242105instacron: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:34982025-09-03 09:47:49.161CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
title Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
spellingShingle Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
Ramirez, Eduardo Alejandro
OCHRATOXIN A
ADSORPTIVE ACCUMULATION
SQUARE WAVE VOLTAMMETRY
THERMODYNAMIC AND KINETICS PARAMETERS
title_short Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
title_full Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
title_fullStr Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
title_full_unstemmed Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
title_sort Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization
dc.creator.none.fl_str_mv Ramirez, Eduardo Alejandro
Zon, María Alicia
Jara Ulloa, Paola Andrea
Squella, Juan Arturo
Nunez Vergara, Luis
Fernandez, Hector
author Ramirez, Eduardo Alejandro
author_facet Ramirez, Eduardo Alejandro
Zon, María Alicia
Jara Ulloa, Paola Andrea
Squella, Juan Arturo
Nunez Vergara, Luis
Fernandez, Hector
author_role author
author2 Zon, María Alicia
Jara Ulloa, Paola Andrea
Squella, Juan Arturo
Nunez Vergara, Luis
Fernandez, Hector
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv OCHRATOXIN A
ADSORPTIVE ACCUMULATION
SQUARE WAVE VOLTAMMETRY
THERMODYNAMIC AND KINETICS PARAMETERS
topic OCHRATOXIN A
ADSORPTIVE ACCUMULATION
SQUARE WAVE VOLTAMMETRY
THERMODYNAMIC AND KINETICS PARAMETERS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We study the thermodynamics and kinetics of the adsorption of a redox couple having quinone nature on glassy carbon electrodes. This couple is produced by the anodic oxidation of mycotoxin ochratoxin A in 10% acetonitrile + 90% 1 M HClO4 aqueous solution. The quasi-reversible redox couple was studied by both cyclic (CV) and square wave (SWV) voltammetric techniques. The Frumkin adsorption isotherm best described the specific interaction of the redox couple with carbon electrodes. By fitting the experimental data, we obtained values of −28.4 kJ mol−1 and 0.70 ± 0.02 for the Gibbs free energy of adsorption and the interaction parameter, respectively. SWV fully characterized the thermodynamics and kinetics of the adsorbed redox couple, using a combination of the “quasi-reversible maximum” and the “splitting of SW peaks” methods. Average values of 0.609 ± 0.003 V and 0.45 ± 0.06 were obtained for the formal potential and the anodic transfer coefficient, respectively. Moreover, a formal rate constant of 10.7 s−1 was obtained. SWV was also employed to generate calibration curves. The lowest concentration of mycotoxin was 1.24 × 10−8 M (5 ppb), measured indirectly with a signal to noise ratio of 3:1.
Fil: Ramirez, Eduardo Alejandro. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Zon, María Alicia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Jara Ulloa, Paola Andrea. Universidad de Chile; Chile
Fil: Squella, Juan Arturo. Universidad de Chile; Chile
Fil: Nunez Vergara, Luis. Universidad de Chile; Chile
Fil: Fernandez, Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química. Área Electroquímica; Argentina
description We study the thermodynamics and kinetics of the adsorption of a redox couple having quinone nature on glassy carbon electrodes. This couple is produced by the anodic oxidation of mycotoxin ochratoxin A in 10% acetonitrile + 90% 1 M HClO4 aqueous solution. The quasi-reversible redox couple was studied by both cyclic (CV) and square wave (SWV) voltammetric techniques. The Frumkin adsorption isotherm best described the specific interaction of the redox couple with carbon electrodes. By fitting the experimental data, we obtained values of −28.4 kJ mol−1 and 0.70 ± 0.02 for the Gibbs free energy of adsorption and the interaction parameter, respectively. SWV fully characterized the thermodynamics and kinetics of the adsorbed redox couple, using a combination of the “quasi-reversible maximum” and the “splitting of SW peaks” methods. Average values of 0.609 ± 0.003 V and 0.45 ± 0.06 were obtained for the formal potential and the anodic transfer coefficient, respectively. Moreover, a formal rate constant of 10.7 s−1 was obtained. SWV was also employed to generate calibration curves. The lowest concentration of mycotoxin was 1.24 × 10−8 M (5 ppb), measured indirectly with a signal to noise ratio of 3:1.
publishDate 2010
dc.date.none.fl_str_mv 2010-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/242105
Ramirez, Eduardo Alejandro; Zon, María Alicia; Jara Ulloa, Paola Andrea; Squella, Juan Arturo; Nunez Vergara, Luis; et al.; Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 55; 3; 1-2010; 771-778
0013-4686
CONICET Digital
CONICET
url http://hdl.handle.net/11336/242105
identifier_str_mv Ramirez, Eduardo Alejandro; Zon, María Alicia; Jara Ulloa, Paola Andrea; Squella, Juan Arturo; Nunez Vergara, Luis; et al.; Adsorption of ochratoxin A (OTA) anodic oxidation product on glassy carbon electrodes in highly acidic reaction media: Its thermodynamic and kinetics characterization; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 55; 3; 1-2010; 771-778
0013-4686
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0013468609011724
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.electacta.2009.09.013
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842268883256344576
score 13.13397

Publicaciones similares