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Resumo:
The mechanism of chloroperoxidase (CPO)-catalyzed peroxidatic reactions of several substituted hydroquinones was studied at various hydrogen peroxide concentrations. The pathway was studied using cytochrome c as the radical trapping agent. As the hydroquinones became more hindered there was a difference in the amount of radicals trapped. For hydroquinone, 59.3% radical pathway, and methylhydroquinone, 81.4% radical, the difference in radicals trapped is due to a difference in pathway. For 2,3-dimethylhydroquinone (75.4%), trimethylhydroquinone (44.5%), and t-butylhydroquinone (0%) other non-peroxidatic reactions are noticed. Thus, for the more substituted hydroquinones the difference in radicals trapped can not be assigned to a difference in radical pathway. Also, there were problems drawing conclusions for this system due to the catalytic reaction of hydrogen peroxide. The radical trapping ability of 2,4,6-trimethylphenol was investigated for various other substrates. TMP reacted with the radicals generated in the enzymatic reactions of phenol, resorcinol, and m-methoxyphenol. Thus, this TMP system offers further potential as another radical trapping agent for use in these studies.