Abstract
The oxidation of uric acid and 3-N-ribosyluric acid by hydrogen peroxide and methemoglobin was stimulated by the addition of sodium nitrite, which alone has no effect on the urates. The urates were not oxidized by either hydrogen peroxide alone or hydrogen peroxide and sodium nitrite unless methemoglobin was present. t-Butyl hydroperoxide also oxidized the urates in the presence of methemoglobin, but the reaction was not stimulated by sodium nitrite. The addition of either sodium azide or potassium cyanide reduced the rate of the reaction with either hydrogen peroxide or t-butyl hydroperoxide both in the presence and absence of sodium nitrite. Possible explanations for the stimulation by nitrite of peroxide-induced degradation of urates are presented.
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