Reactions of nitrate radical with amino acids in acidic aqueous medium: a flash photolysis investigation

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Abstract

The reactions of nitrate radical (photochemically generated by the flash photolysis of a mixture of ceric ammonium nitrate and nitric acid) with amino acids are reported. An electron transfer reaction pathway is proposed for phenylalanine and histidine, whereas a hydrogen abstraction pathway is invoked for the other amino acids, based on the magnitudes of the second- order rate constants and teh observation of cation radicals. The reactivity of the nitrate radical is compared with that of other oxidizing radicals, such as Cl2CO3and SO4. The nitrte radical is expected to show a higher reactivity than SO4 based on their redox couples, but an inverse reactivity relationship is observed and is suggested to be due to the difference in solvation in the transition state.

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