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dc.contributor.author
Barúa, María Gloria
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Escalada, Juan Pablo
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Bregliani, Mabel Margarita
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Pajares, Adriana Mabel
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Criado, Susana Noemi
dc.date.available
2018-07-27T17:11:25Z
dc.date.issued
2016-11
dc.identifier.citation
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
dc.identifier.issn
1351-0002
dc.identifier.uri
http://hdl.handle.net/11336/53298
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Maney Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Antioxidants
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Catechins
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Photodegradation
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Reactive Oxygen Species
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Riboflavin
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Vitamin B2
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Otras Ciencias Químicas
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B2
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-17T14:05:25Z
dc.journal.volume
22
dc.journal.number
6
dc.journal.pagination
282-289
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Barúa, María Gloria. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
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Fil: Escalada, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
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Fil: Bregliani, Mabel Margarita. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
dc.description.fil
Fil: Pajares, Adriana Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Río Gallegos; Argentina
dc.description.fil
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
dc.journal.title
Redox Report
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1080/13510002.2016.1240287
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/13510002.2016.1240287
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