Study of the iron catechin complexes in dimethyl sulphoxide. Redox chemistry and interaction with superoxide radical anion in this medium.

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dc.contributor.authorBodini, ME
dc.contributor.authorDel Valle, MA
dc.contributor.authorTapia, R
dc.contributor.authorLeighton, F
dc.contributor.authorGonzalez, L
dc.date.accessioned2025-01-21T01:30:44Z
dc.date.available2025-01-21T01:30:44Z
dc.date.issued2001
dc.description.abstractThe redox chemistry of catechin (catH(2)) and its iron complexes has been studied in dimethyl sulphoxide. In the absence of base a one-to-one iron (II)-catechin complex is formed which exhibits oxidation processes at 0.28, 0.66, and 0.92 V vs SCE. These processes correspond to the oxidation of Fe(II) to Fe(III), the formation of the quinonic form of the catechol moiety and the oxidation of another hydroxy group to a radical. In the presence of base a stable 1:1 complex is formed with oxidation processes that show up at +0.25, +0.64, and +0.88 V vs SCE. The voltammetric and spectroscopic characterization of the species produced after the oxidation processes is described. Upon interaction of the complex with superoxide radical anion in dimethyl sulphoxide, the basic character of this radical anion causes the formation of the monoanion of catechin leading to a more stable complex of iron(II). The protonated superoxide disproportionates to molecular oxygen and peroxide, causing the oxidation of the metal ion. The addition of a second equivalent of superoxide oxidizes bound catechin to the corresponding semiquinone. The formation of hydroxy radicals through Fenton chemistry does not take place because peroxide is consumed and the metal ion remains as a stable iron(III) complex.
dc.fuente.origenWOS
dc.identifier.issn0366-1644
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96875
dc.identifier.wosidWOS:000172210200011
dc.issue.numero3
dc.language.isoen
dc.pagina.final317
dc.pagina.inicio309
dc.revistaBoletin de la sociedad chilena de quimica
dc.rightsacceso restringido
dc.subjectcatechin
dc.subjectantioxidants
dc.subjectiron complexes
dc.subjectsuperoxide
dc.subjectdimethyl sulphoxide
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleStudy of the iron catechin complexes in dimethyl sulphoxide. Redox chemistry and interaction with superoxide radical anion in this medium.
dc.typeartículo
dc.volumen46
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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