Absolute rate constants of alkoxyl radical reactions in aqueous solution. [Tert-butyl hydroperoxide]
The pulse radiolysis technique was used to generate the alkoxyl radical derived from tert-butyl hydroperoxide (/sup t/BuOOH) in aqueous solution. The reactions of this radical with 2,2'-azinobis(3-ethyl-6-benzothiazolinesulfonate) (ABTS) and promethazine were monitored by kinetic spectroscopy. The unimolecular decay rate constant of the tert-butoxyl radical (/sup t/BuO) was determined to be 1.4 x 10/sup 6/ s/sup -1/. On the basis of this value, the rate constants for /sup t/BuO attack on quercetin, crocin, crocetin, ascorbate, isoascorbate, trolox c, glutathione, thymidine, adenosine, guanosine, and unsaturated fatty acids were determined. In addition, the reaction of /sup t/BuO with the polyunsaturated fatty acids (PUFA) was observed by directly monitoring the formation of the fatty acid pentadienyl radicals. Interestingly, the attack of /sup t/BuO on PUFA was found to be faster by about one order of magnitude as compared to the same reaction in a nonpolar solvent.
- Research Organization:
- Gesellscaft fuer Straheln- und Umweltforschung, Neuherberg, West Germany
- OSTI ID:
- 6762772
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
ORGANIC OXYGEN COMPOUNDS
CHEMICAL REACTIONS
RADIOLYSIS
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
PULSE TECHNIQUES
RADICALS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
DATA
DECOMPOSITION
DISPERSIONS
INFORMATION
KINETICS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
REACTION KINETICS
SOLUTIONS
400201* - Chemical & Physicochemical Properties
400600 - Radiation Chemistry