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	Provedor de dados Biol. Res. (1) BJM (1) Autor BORS,WOLF (1) CHRISTA,MICHEL (1) Gao,Pei-ji (1) L. YEAP,FOO (1) Lu,Xue-mei (1) STETTMAIER,KURT (1) Sun,Hong-qi (1) YINRONG,LU (1) Mais... Palavra-chave Hydroxyl radical (2) Antibacterial activity (1) Caffeic acid oligomer (1) Catechol semiquinone (1) Chelator (1) Electron paramagnetic resonance (1) Ferric ion (1) Kinetic modeling (1) Pulse radiolysis (1) Salvia officinalis (1) Siderophore (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Journal article (1) Ano 2011 (1) 2004 (1) País Brazil (1) Chile (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 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 The exploration of the antibacterial mechanism of fe3+ against bacteria BJM Sun,Hong-qi; Lu,Xue-mei; Gao,Pei-ji. This study demonstrated that the bacteria could adsorb Fe3+ and reduce Fe3+ to Fe2+. Iron had significant bacteriostatic effects, which were directly proportional to the iron concentration and under the influence of pH and chelator. It presumed that the inhibition of Fe3+ acts through the formation of hydroxyl free radicals. Tipo: Info:eu-repo/semantics/article Palavras-chave: Antibacterial activity; Chelator; Hydroxyl radical; Ferric ion; Siderophore. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100050 Registros recuperados: 2 Primeira ... 1 ... Última

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