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	Provedor de dados Biol. Res. (1) Autor BORS,WOLF (1) CHRISTA,MICHEL (1) L. YEAP,FOO (1) STETTMAIER,KURT (1) YINRONG,LU (1) Palavra-chave Caffeic acid oligomer (1) Catechol semiquinone (1) Electron paramagnetic resonance (1) Hydroxyl radical (1) Kinetic modeling (1) Pulse radiolysis (1) Salvia officinalis (1) Mais... Tipo do documento Journal article (1) Ano 2004 (1) País Chile (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Antioxidant Mechanisms of Polyphenolic Caffeic Acid Oligomers, Constituents of Salvia officinalis Biol. Res. BORS,WOLF; CHRISTA,MICHEL; STETTMAIER,KURT; YINRONG,LU; L. YEAP,FOO. Caffeic acid, rosmarinic acid and oligomers of caffeic acid with multiple catechol groups are all constituents of Salvia officinalis. Their antioxidant potential was investigated with regard to their radical scavenging activity and the stability and structure of the intermediate radicals. Pulse-radiolytic studies revealed very high rate constants with hydroxyl radicals. Evidence from kinetic modeling calculations suggested an unusual complex behavior due to the presence of both O4- and O3-semiquinones and formation and decay of a hydroxyl radical adduct at the vinyl side chain. The radical structures observed by EPR spectroscopy after autoxidation in slightly alkaline solutions were only partially identified due to their instability and generally... Tipo: Journal article Palavras-chave: Caffeic acid oligomer; Catechol semiquinone; Electron paramagnetic resonance; Hydroxyl radical; Kinetic modeling; Pulse radiolysis; Salvia officinalis. Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200017 Registros recuperados: 1 Primeira ... 1 ... Última

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