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Innate immunity in Arabidopsis thaliana: lipopolysaccharides activate nitric oxide synthase (NOS) and induce defense genes.
It is shown that Arabidopsis thaliana reacts to LPS with a rapid burst of NO, a hallmark of innate immunity in animals and contributes toward the activation of plant defense responses. Expand
Flavonoids as antioxidants: determination of radical-scavenging efficiencies.
The radical chemistry of flavonoids not only is of interest from a kinetic or mechanistic point of view but also offers considerable insight into structural relationships of highly evolved plant components. Expand
Polyamines as radical scavengers and protectants against ozone damage
Abstract Leaf injury of the ozone-sensitive tobacco cultivar Bel W 3 caused by ozone treatments was prevented to a large extent by root application of putrescine, spermidine or spermine. The titresExpand
Inhibition of the bleaching of the carotenoid crocin a rapid test for quantifying antioxidant activity
Abstract The carotenoids crocin and canthaxanthin were bleached by photolytically produced alkoxyl radicals derived from either tert-butyl hydroperoxide or fatty acid hydroperoxides. The inhibitionExpand
Chemistry of the Antioxidant Effect of Polyphenols
  • W. Bors, C. Michel
  • Chemistry, Medicine
  • Annals of the New York Academy of Sciences
  • 1 May 2002
With pulse radiolysis experiments, absolute scavenging rate constants can be obtained with a variety of oxidizing radicals which allow further structure‐activity correlations and, combined with EPR spectroscopy, detailed insight into the mechanisms governing these antioxidant reactions. Expand
Antioxidant capacity of flavanols and gallate esters: pulse radiolysis studies.
  • W. Bors, C. Michel
  • Chemistry, Medicine
  • Free radical biology & medicine
  • 1 December 1999
Proanthocyanidins are considered superior radical scavenging agents as compared with the monomeric flavonols and flavones and proposed that these substances rather than the flavonoids proper represent the antioxidative principle in red wine and green tea. Expand
Electron paramagnetic resonance studies of radical species of proanthocyanidins and gallate esters.
It is proposed that proanthocyanidins are superior antioxidants as compared to flavon(ol)s proper, whose quinones are more likely to redox-cycle and act as prooxidants. Expand
The kinetics and thermodynamics of quinone–semiquinone–hydroquinone systems under physiological conditions
The steady-state concentration of semiquinones (Q˙–) determined by EPR in the mixtures of eleven alkyl-, methoxy- and chloro-substituted 1,4-benzoquinones as well as 1,4-naphthoquinone (Q) withExpand
Radical chemistry of flavonoid antioxidants.
Flavonoid aglycones, members of an ubiquitous class of plant phenols, have often been proposed to act as antioxidants, but only qualitative conclusions could be drawn. Expand
Studies on radical intermediates in the early stage of the nonenzymatic browning reaction of carbohydrates and amino acids.
Determination of the color intensity of heated mixtures of L-alanine and carbohydrate degradation products revealed furan-2-carboxaldehyde and glycolaldehyde as by far the most effective color precursors and pyrazinium radicals cations are not stable but are easily transformed into hydroxylated 1,4-dialkyl-1, 4-dihydropyrazines upon oxidation and hydrolysis of intermediate diquarternary pyrazine ions. Expand