Abstract
Polarographic studies of the effects of γ-radiation on cytosine supplementing the Ekert-Monier scheme showed that isobarbituric acid undergoes further radiation-induced reactions. The temporary yellow-green coloration and the green fluorescence were ascribed to the formation of 4,4′-diisobarbituric acid. Further radiolytic products of isobarbituric acid were found to be isodialuric and dialuric acids. The very easy oxidation of dialuric acid leads to the formation of alloxan and subsequently to the system dialuric acid + alloxan ⇌ alloxantin. With increasing radiation dose, parabanic acid is also formed, probably as an oxidative product of alloxanic acid formed by a benzilic acid type of rearrangement of alloxan. However, parabanic acid undergoes hydrolysis, giving rise to oxaluric acid. Above a radiation dose of 5 × 10 20 ev ml −1, the over-all effects are ring opening and hydrolytic formation of simple aliphatic compounds, the solution again turning colorless.
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