Journal ArticleDOI
Formation of positive ions and other primary species in the oxidation of sulphides by hydroxyl radicals
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The first step is addition of the OH· to sulphur to form R2ṠOH radicals, and the stable oxidation product, sulphoxide, has been identified as discussed by the authors.Abstract:
The oxidation of simple aliphatic sulphides [MeSMe, EtSEt, (CH2)4S] by hydroxyl radicals occurs via a complex reaction mechanism. The first step is addition of the OH· to sulphur to form R2ṠOH radicals. At low sulphide concentrations ( 1 ms) positive ions. The stable oxidation product, sulphoxide, has been identified.read more
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Journal ArticleDOI
Methionine oxidation by reactive oxygen species: reaction mechanisms and relevance to Alzheimer's disease
TL;DR: Detailed mechanistic schemes for the reactions of various prominent, biologically relevant ROS with methionine and organic model sulfides are provided, characterizing the physico-chemical parameters, which control this mechanism, and its physiological relevance, specifically for the oxidation and neurotoxicity of the Alzheimer's disease beta-amyloid peptide (betaAP).
Journal ArticleDOI
Reactive oxygen species and biological aging: a mechanistic approach.
TL;DR: It will evolve that the in vivo accumulation of oxidized calModulin cannot be the result of the reaction of an individual reactive oxygen species with calmodulin in homogenous solution alone, and complexation of calmodulins to cal modulin-binding proteins and protein turnover are additional parameters likely contributing to the accumulation of specifically modified calmod insulin.
Book ChapterDOI
[15] Sulfur-centered free radicals
TL;DR: In this paper, the formation and essential physicochemical properties of radical species from the three major classes of organic sulfur compounds are discussed, namely, thiols, disulfides, and monosulfides.
Journal ArticleDOI
Amino acid nitrogen in atmospheric aerosols: Occurrence, sources and photochemical modification
Peter J. Milne,Rod G. Zika +1 more
TL;DR: The photochemistry of covalently bound amino groups, particularly as found in peptides and amino acids, is discussed in this article with the purpose of summarizing what is known of their occurrence and their possible importance to atmospheric chemistry.
Journal ArticleDOI
Photosensitized Oxidation of Sulfides: Discriminating between the Singlet-Oxygen Mechanism and Electron Transfer Involving Superoxide Anion or Molecular Oxygen
TL;DR: This work considers that reaction between R(2)S(*+) and O(2)(*-) mainly involves back electron transfer, whereas sulfoxidation results primarily from the reaction of the sulfide radical cation with molecular oxygen, and explains the larger scope of ET sulf Oxidation with respect to the singlet-oxygen process.