Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2
- Autores
- Barúa, María Gloria; Escalada, Juan Pablo; Bregliani, Mabel Margarita; Pajares, Adriana Mabel; Criado, Susana Noemi
- Año de publicación
- 2016
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Objectives: Catechins are important components of human diet and have received special attention due to their antioxidant capacity. The purpose of this paper was to study the antioxidant action of (+)-catechin (CTQ) in the presence of vitamin B2 (riboflavin) as light-absorbing agent. Furthermore, two model compounds, catechol (CTC) and resorcinol (RSC), were selected in order to elucidate the reactive target of the CTQ molecule. The influence of pH-medium was investigated. Methods: Stationary photolysis, polarographic detection of dissolved oxygen, reactive oxygen species (ROS)-scavengers, time-resolved near-IR phosphorescence detection, stationary, and time-resolved fluorescence and laser flash photolysis techniques were employed. Results: CTQ interacts with riboflavin under visible-light photoirradiation as well as with different ROS which are generated in this mechanism. Radical-scavenging activity increases with increasing of pH-medium. Discussion: pH-effect of the medium on radical-scavenging activity comes from the increased electron-donating ability of CTQ upon deprotonation. These results are very interesting due to the fact that the pH of the food products displays important variations. The O2(1Δg) -scavenging ability of CTQ, would be equal to the additive contribution of each reactive center, CTC, and RSC, present at the molecule of CTQ. However, CTQ would have a moderate ability to removal of O2(1Δg) -species at pH 7.
Fil: Barúa, María Gloria. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
Fil: Escalada, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
Fil: Bregliani, Mabel Margarita. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
Fil: Pajares, Adriana Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
Fil: Criado, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina - Materia
-
ANTIOXIDANTS
CATECHINS
PHOTODEGRADATION
REACTIVE OXYGEN SPECIES
RIBOFLAVIN
VITAMIN B2 - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/53298
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/53298 |
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Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2Barúa, María GloriaEscalada, Juan PabloBregliani, Mabel MargaritaPajares, Adriana MabelCriado, Susana NoemiANTIOXIDANTSCATECHINSPHOTODEGRADATIONREACTIVE OXYGEN SPECIESRIBOFLAVINVITAMIN B2https://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Objectives: Catechins are important components of human diet and have received special attention due to their antioxidant capacity. The purpose of this paper was to study the antioxidant action of (+)-catechin (CTQ) in the presence of vitamin B2 (riboflavin) as light-absorbing agent. Furthermore, two model compounds, catechol (CTC) and resorcinol (RSC), were selected in order to elucidate the reactive target of the CTQ molecule. The influence of pH-medium was investigated. Methods: Stationary photolysis, polarographic detection of dissolved oxygen, reactive oxygen species (ROS)-scavengers, time-resolved near-IR phosphorescence detection, stationary, and time-resolved fluorescence and laser flash photolysis techniques were employed. Results: CTQ interacts with riboflavin under visible-light photoirradiation as well as with different ROS which are generated in this mechanism. Radical-scavenging activity increases with increasing of pH-medium. Discussion: pH-effect of the medium on radical-scavenging activity comes from the increased electron-donating ability of CTQ upon deprotonation. These results are very interesting due to the fact that the pH of the food products displays important variations. The O2(1Δg) -scavenging ability of CTQ, would be equal to the additive contribution of each reactive center, CTC, and RSC, present at the molecule of CTQ. However, CTQ would have a moderate ability to removal of O2(1Δg) -species at pH 7.Fil: Barúa, María Gloria. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; ArgentinaFil: Escalada, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; ArgentinaFil: Bregliani, Mabel Margarita. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; ArgentinaFil: Pajares, Adriana Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; ArgentinaFil: Criado, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; ArgentinaManey Publishing2016-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/53298Barúa, María Gloria; Escalada, Juan Pablo; Bregliani, Mabel Margarita; Pajares, Adriana Mabel; Criado, Susana Noemi; Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2; Maney Publishing; Redox Report; 22; 6; 11-2016; 282-2891351-0002CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1080/13510002.2016.1240287info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/13510002.2016.1240287info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:25Zoai:ri.conicet.gov.ar:11336/53298instacron: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 10:07:26.039CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
title |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
spellingShingle |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 Barúa, María Gloria ANTIOXIDANTS CATECHINS PHOTODEGRADATION REACTIVE OXYGEN SPECIES RIBOFLAVIN VITAMIN B2 |
title_short |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
title_full |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
title_fullStr |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
title_full_unstemmed |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
title_sort |
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2 |
dc.creator.none.fl_str_mv |
Barúa, María Gloria Escalada, Juan Pablo Bregliani, Mabel Margarita Pajares, Adriana Mabel Criado, Susana Noemi |
author |
Barúa, María Gloria |
author_facet |
Barúa, María Gloria Escalada, Juan Pablo Bregliani, Mabel Margarita Pajares, Adriana Mabel Criado, Susana Noemi |
author_role |
author |
author2 |
Escalada, Juan Pablo Bregliani, Mabel Margarita Pajares, Adriana Mabel Criado, Susana Noemi |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
ANTIOXIDANTS CATECHINS PHOTODEGRADATION REACTIVE OXYGEN SPECIES RIBOFLAVIN VITAMIN B2 |
topic |
ANTIOXIDANTS CATECHINS PHOTODEGRADATION REACTIVE OXYGEN SPECIES RIBOFLAVIN VITAMIN B2 |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Objectives: Catechins are important components of human diet and have received special attention due to their antioxidant capacity. The purpose of this paper was to study the antioxidant action of (+)-catechin (CTQ) in the presence of vitamin B2 (riboflavin) as light-absorbing agent. Furthermore, two model compounds, catechol (CTC) and resorcinol (RSC), were selected in order to elucidate the reactive target of the CTQ molecule. The influence of pH-medium was investigated. Methods: Stationary photolysis, polarographic detection of dissolved oxygen, reactive oxygen species (ROS)-scavengers, time-resolved near-IR phosphorescence detection, stationary, and time-resolved fluorescence and laser flash photolysis techniques were employed. Results: CTQ interacts with riboflavin under visible-light photoirradiation as well as with different ROS which are generated in this mechanism. Radical-scavenging activity increases with increasing of pH-medium. Discussion: pH-effect of the medium on radical-scavenging activity comes from the increased electron-donating ability of CTQ upon deprotonation. These results are very interesting due to the fact that the pH of the food products displays important variations. The O2(1Δg) -scavenging ability of CTQ, would be equal to the additive contribution of each reactive center, CTC, and RSC, present at the molecule of CTQ. However, CTQ would have a moderate ability to removal of O2(1Δg) -species at pH 7. Fil: Barúa, María Gloria. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina Fil: Escalada, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina Fil: Bregliani, Mabel Margarita. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina Fil: Pajares, Adriana Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina Fil: Criado, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina |
description |
Objectives: Catechins are important components of human diet and have received special attention due to their antioxidant capacity. The purpose of this paper was to study the antioxidant action of (+)-catechin (CTQ) in the presence of vitamin B2 (riboflavin) as light-absorbing agent. Furthermore, two model compounds, catechol (CTC) and resorcinol (RSC), were selected in order to elucidate the reactive target of the CTQ molecule. The influence of pH-medium was investigated. Methods: Stationary photolysis, polarographic detection of dissolved oxygen, reactive oxygen species (ROS)-scavengers, time-resolved near-IR phosphorescence detection, stationary, and time-resolved fluorescence and laser flash photolysis techniques were employed. Results: CTQ interacts with riboflavin under visible-light photoirradiation as well as with different ROS which are generated in this mechanism. Radical-scavenging activity increases with increasing of pH-medium. Discussion: pH-effect of the medium on radical-scavenging activity comes from the increased electron-donating ability of CTQ upon deprotonation. These results are very interesting due to the fact that the pH of the food products displays important variations. The O2(1Δg) -scavenging ability of CTQ, would be equal to the additive contribution of each reactive center, CTC, and RSC, present at the molecule of CTQ. However, CTQ would have a moderate ability to removal of O2(1Δg) -species at pH 7. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-11 |
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/11336/53298 Barúa, María Gloria; Escalada, Juan Pablo; Bregliani, Mabel Margarita; Pajares, Adriana Mabel; Criado, Susana Noemi; Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2; Maney Publishing; Redox Report; 22; 6; 11-2016; 282-289 1351-0002 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/53298 |
identifier_str_mv |
Barúa, María Gloria; Escalada, Juan Pablo; Bregliani, Mabel Margarita; Pajares, Adriana Mabel; Criado, Susana Noemi; Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2; Maney Publishing; Redox Report; 22; 6; 11-2016; 282-289 1351-0002 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1080/13510002.2016.1240287 info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/13510002.2016.1240287 |
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 application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Maney Publishing |
publisher.none.fl_str_mv |
Maney Publishing |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1842270003571720192 |
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13.13397 |