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Different channels of ·OH radical reaction with tryptophanol in aqueous solutions: A pulse radiolysis study

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The pulse radiolysis technique has been employed to study the reaction of ·OH radical with tryptophanol (TPN). Reactions of specific one-electron oxidants like Br2· - and N3· and ·H atom were carried out to understand the contribution of different channels of · OH radical reaction with TPN. The studies were carried out in the pH range 3 to 10. One-electron oxidation of TPN (pH 3) produced radical cation absorbing at 570 nm. However, at higher pH, deprotonation of TPN cation radical takes place from N(1) position and indolyl radical absorbing at 520 nm with a pKa value of 3.6 is formed. Redox titration with TMPD, ABTS2- and MV2+ was performed to determine the total yield of oxidizing and reducing radicals produced during ·OH reaction.


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