Radical formation during phenol oxidation in aqueous media

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Abstract

Kinetics of oxygen consumption, reaction product formation, and chemiluminescence during polyphenol oxidation by molecular oxygen in alkaline aqueous media with additions of l-ascorbic acid (AscH2) and homocysteine (HCys) has been investigated. In these processes, AscH2 and HCys have been shown to act as typical radical-reaction inhibitors that can be used for determinations of the radical formation rates. The rates of radical formation during oxidation of hydroquinone (p-QH2), chlorohydroquinone (Cl-QH2), 2,5-dichlorohydroquinone (2,5Cl-QH2), catechol (PK), 4-methylcatechol (4CH3-PK), pyrogallol (PG), gallic acid (GK) have been estimated. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 414–422, 2012

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