title: Non-reductive scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) by peroxyradical: a useful method for quantitative analysis of peroxyradical.
abstract: A stable radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) has long been used as a convenient method for the antioxidant assay of biological materials such as cysteine, glutathione, ascorbic acid, tocopherol and polyhydroxy aromatic compounds (hydroquinone, pyrogallol, etc.). In this study, non-reductive scavenging of DPPH was investigated by electron spin resonance (ESR) analyses for the purpose of developing a useful method for quantitative determination of peroxyradical. Since DPPH was degraded in the presence of peroxyradical derived from UV-irradiated benzoylperoxide and the peroxyradical-induced degradation of DPPH was inhibited by the addition of a spin trapping agent 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), it is concluded that DPPH is non-reductively scavenged by peroxyradical. Therefore, it is suggested that DPPH could be a useful agent for the quantitative measurement of peroxyradical.
authors.affiliation: New Industry Creation Hatchery Center, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nishizawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kohno
authors.forename: Minemitsu
authors.initials: M
authors.lastname: Nishimura
authors.forename: Akio
authors.initials: A
authors.lastname: Kitagawa
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Niwano
mesh_terms: D001713:Biphenyl Compounds / Q000032:analysis* / Q000737:chemistry; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D016166:Free Radical Scavengers / Q000032:analysis* / Q000737:chemistry; D005609:Free Radicals / Q000032:analysis* / Q000737:chemistry; D006834:Hydrazines / Q000032:analysis* / Q000737:chemistry; D010851:Picrates
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D005609:Free Radicals; D006834:Hydrazines; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl