title: Studies on reactions of oxidizing sulfur-sulfur three-electron-bond complexes and reducing alpha-amino radicals derived from OH reaction with methionine in aqueous solution.
abstract: The technique of pulse radiolysis with spectrophotometric detection has been used to investigate the possibility of electron transfer reactions between oxidizing sulfur-sulfur three-electron-bond complexes (Met2/S thereforeS+), or reducing alpha-amino radicals (CH3SCH2CH2CH.NH2) derived from reaction of methionine with OH radicals and hydroxycinnamic acid (HCA) derivatives, riboflavin (RF) or flavin adenine dinucleotide (FAD), respectively. The HCA derivatives, such as caffeic acid, ferulic acid, sinapic acid and chlorogenic acid, widely distributed phenolic acids in fruit and vegetables, have been identified as good antioxidants previously can rapidly and efficiently repair oxidizing three-electron-bond complexes via electron transfer. RF and FAD can oxidize reducing alpha-amino radicals derived from methionine. The electron transfer rate constants approximately 10(9) dm3 x mol(-1)x s(-1) were determined by following the build-up kinetics of species produced.
authors.affiliation: Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, P.O. Box 800-204, 201800, Shanghai, China. sideyao@sinr.ac.cn
authors.forename: C
authors.initials: C
authors.lastname: Lu
authors.forename: S
authors.initials: S
authors.lastname: Yao
authors.forename: N
authors.initials: N
authors.lastname: Lin
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology; D003373:Coumaric Acids / Q000737:chemistry / Q000494:pharmacology; D004579:Electron Transport / Q000187:drug effects; D005182:Flavin-Adenine Dinucleotide / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology; D005609:Free Radicals / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D066298:In Vitro Techniques; D008715:Methionine / Q000737:chemistry* / Q000378:metabolism*; D010084:Oxidation-Reduction; D011675:Pulse Radiolysis; D012256:Riboflavin / Q000494:pharmacology; D012996:Solutions; D013053:Spectrophotometry; D013455:Sulfur / Q000737:chemistry; D014867:Water
chemical_list: D000975:Antioxidants; D003373:Coumaric Acids; D016166:Free Radical Scavengers; D005609:Free Radicals; D012996:Solutions; D014867:Water; D005182:Flavin-Adenine Dinucleotide; D017665:Hydroxyl Radical; D013455:Sulfur; D008715:Methionine; D012256:Riboflavin