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dc.contributor.author
Natera, Jose Eduardo
dc.contributor.author
Massad, Walter Alfredo
dc.contributor.author
Garcia, Norman Andino
dc.date.available
2023-03-03T17:45:35Z
dc.date.issued
2011-03
dc.identifier.citation
Natera, Jose Eduardo; Massad, Walter Alfredo; Garcia, Norman Andino; Vitamin B1 as a scavenger of reactive oxygen species photogenerated by vitamin B2; Wiley Blackwell Publishing, Inc; Photochemistry and Photobiology; 87; 2; 3-2011; 317-323
dc.identifier.issn
0031-8655
dc.identifier.uri
http://hdl.handle.net/11336/189553
dc.description.abstract
Kinetics and mechanism of photoprocesses generated by visible light-irradiation of the system riboflavin (Rf, vitamin B2) plus Thiamine (Th) and Thiamine pyrophosphate (ThDP), representing vitamin B1, was studied in pH 7 water. A weak dark complex vitamin B2-vitamin B1, with a mean value of 4 ± 0.4 m-1 is formed. An intricate mechanism of competitive reactions operates upon photoirradiation, being the light only absorbed by Rf. Th and ThDP quench excited singlet and triplet states of Rf, with rate constants in the order of 109 and 106m-1s-1, respectively. With Vitamin B1 in a concentration similar to that of dissolved molecular oxygen in water, the quenching of triplet excited Rf by the latter is highly predominant, resulting in the generation of O2( 1Δg). Superoxide radical anion was not detected under work conditions. A relatively slow O2(1Δ g)-mediated photodegradation of Th and ThDP was observed. Nevertheless, Th and especially ThDP behave as efficient physical deactivators of O2(1Δg). The thiazol structure in vitamin B1 appears as a good scavenger of this reactive oxygen species. This characteristic, that presents at vitamin B1 as a potential photoprotector of biological entities against O2(1Δg) attack, was been experimentally confirmed employing the protein lisozime as a photo-oxidizable target. © 2010 The American Society of Photobiology.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
THYAMINE
dc.subject
RIBOFLAVIN
dc.subject
PHOTOOXDATION
dc.subject
ANTIOXIDANT
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Vitamin B1 as a scavenger of reactive oxygen species photogenerated by 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
2023-02-27T16:40:51Z
dc.identifier.eissn
1751-1097
dc.journal.volume
87
dc.journal.number
2
dc.journal.pagination
317-323
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Natera, Jose Eduardo. Universidad Nacional de Río Cuarto. Instituto para el Desarrollo Agroindustrial y de la Salud. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto para el Desarrollo Agroindustrial y de la Salud; Argentina
dc.description.fil
Fil: Massad, Walter Alfredo. Universidad Nacional de Río Cuarto. Instituto para el Desarrollo Agroindustrial y de la Salud. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto para el Desarrollo Agroindustrial y de la Salud; Argentina
dc.description.fil
Fil: Garcia, Norman Andino. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Photochemistry and Photobiology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1111/j.1751-1097.2010.00867.x
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