Dynamics of reaction of [meso-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinato]iron(III) hydrate with tert-butyl hydroperoxide in aqueous solution. II. Establishment of a mechanism that involves homolytic oxygen-oxygen bond breaking and one-electron oxidation of the iron(III) porphyrin

1989 ◽  
Vol 111 (4) ◽  
pp. 1477-1483 ◽  
Author(s):  
P. N. Balasubramanian ◽  
John R. Lindsay Smith ◽  
Michael J. Davies ◽  
Thomas W. Kaaret ◽  
Thomas C. Bruice
Keyword(s):  
Aqueous Solution ◽  
Bond Breaking ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Oxygen Oxygen ◽  
Tert Butyl Hydroperoxide ◽  
Oxygen Bond

The radical versus ionic mechanisms of reduced cobalamin inactivation by tert-butyl hydroperoxide and hydrogen peroxide in aqueous solution

2021 ◽  
Author(s):  
Denis S. Salnikov ◽  
Sergei V. Makarov ◽  
Oscar I. Koifman
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Tert Butyl Hydroperoxide ◽  
Ionic Mechanisms

It was demonstrated that antioxidants cannot protect reduced cobalamin against its modification by hydrogen peroxide.

scholarly journals Mechanism of protection of adenosine from tert-butoxyl radicals and repair of adenosine radicals by α-tocopherol in aqueous solution

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
G. Vijayalakshmmi ◽  
M. Adinarayanna ◽  
P. Jayaprrakash Rao
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Butyl Alcohol ◽  
Quantum Yields ◽  
Oh Radicals ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Tert Butyl Hydroperoxide ◽  
Tert Butyl Alcohol

The rates of oxidation of adenosine and α-tocopherol by tert-butoxyl radicals (t-BuO•) were studied spectrophotometrically. Radicals (t-BuO•) were generated by the photolysis of tert-butyl hydroperoxide (t-BuOOH) in presence of tert-butyl alcohol to scavenge •OH radicals. The rates and the quantum yields () of oxidation of α-tocopherol by t-BuO• radicals were determined in the absence and presence of varying concentrations of adenosine. An increase in the concentration of adenosine was found to decrease the rate of oxidation of α-tocopherol, suggesting that adenosine and α-tocopherol competed for t-BuO• radicals. From competition kinetics, the rate constant of α-tocopherol reaction with t-BuO• was calculated to be 7.29 x 108 dm3 mol-1 s-1. The quantum yields expt and cal values suggested that α-tocopherol not only protected adenosine from t-BuO• radicals, but also repaired adenosine radicals, formed by the reaction of adenosine with t-BuO• radicals.

Sign in / Sign up

Export Citation Format

Share Document