Evidence for the addition of the superoxide anion to the anti-oxidant n-propyl gallate in aqueous solution.
n-Propyl gallate reacts with the superoxide radical anion in aqueous solution (k = 5.1 x 10(5) mol-1 dm3 s-1). The spectrum of the transient species so formed has been measured (absorbance maximum at 550 nm, epsilon = 1360 mol-1 dm3 cm-1). Electron or H atom transfer processes as well as proton abstraction have been excluded as possible mechanisms, and it is proposed that an addition reaction takes place.
Deeble
D J
DJ
Research Division, North East Wales Institute of Higher Education, Connah's Quay, Deeside, Clwyd, U.K.
Parsons
B J
BJ
Phillips
G O
GO
D000975:Antioxidants; D004583:Electrons; D005609:Free Radicals; D005707:Gallic Acid / Q000031:analogs & derivatives; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D011435:Propyl Gallate; D011675:Pulse Radiolysis; D012996:Solutions; D013481:Superoxides
D000975:Antioxidants; D005609:Free Radicals; D012996:Solutions; D013481:Superoxides; D005707:Gallic Acid; D011435:Propyl Gallate