Long-lived radicals of amino acids induced by X-ray radiation are the source of hydrogen peroxide in aqueous medium |
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Authors: | S V Gudkov S A Garmash O E Karp V S Smirnova A V Chernikov V I Bruskov |
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Institution: | 1.Institute of Theoretical and Experimental Biophysics,Russian Academy of Sciences,Pushchino, Moscow Region,Russia;2.Pushchino State University,Pushchino, Moscow Region,Russia |
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Abstract: | Formation of long-lived radicals in solutions of casein and its hydrolysate with an equimolar mixture of amino acids was compared
by measuring the X-ray-induced chemiluminescence. It was shown that free amino acids constituting the protein produce long-lived
radicals. It was demonstrated that some amino acids (Leu, Ile, Val, Ser, Trp, Met, Pro, Arg, Gly, Phe) emit light of visible
spectrum over a long period of time after irradiation, which indicates generation of long-lived radicals of these amino acids.
The half-life times of these radicals are several hours. Dissolution of irradiated dry amino acids capable of luminescing
over a long time causes formation of hydrogen peroxide in the aqueous medium. |
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