Mechanism of phenylalanine destruction under the influence of uv radiation and reactive oxygen species

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Abstract

The degradation of phenylalanine in an acidic aqueous solution (pH 3) with a concentration of 1.33 × 10–3 mol/L under the action of UV radiation of a 253.7 nm mercury lamp, hydroxyl radicals generated by cold plasma of a corona electric discharge, and hydroperoxyl radicals formed in water under the action of pulsed radiation of a hot plasma was studied. The degradation product identified by the fluorescence method is tyrosine. The quantum yields of phenylalanine degradation and tyrosine formation in solutions saturated and depleted in atmospheric oxygen were determined. Possible reaction mechanisms were considered.

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About the authors

I. M. Piskarev

D.V. Skobeltsyn Research Institute of Nuclear Physics, Moscow State University named after M.V. Lomonosov

Author for correspondence.
Email: i.m.piskarev@gmail.com
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Dependence on the dose, J/(10 ml), of concentrations [C], mmol/l, of phenylalanine and tyrosine during treatment of a phenylalanine solution with UV radiation from a mercury lamp.

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3. Fig. 2. Dependence on the dose, J/(10 ml), of concentrations [C], mmol/l, of phenylalanine and tyrosine during the treatment of a phenylalanine solution with hot plasma radiation from the IR10 generator.

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4. Fig. 3. Dependence on the dose, J/(10 ml), of concentrations [C], mmol/l, of phenylalanine and tyrosine during the treatment of a phenylalanine solution with cold plasma of a corona electric discharge.

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5. Reaction 4

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6. Reaction 5

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