The Autoxidation of 2,3-Dihydroxy-2-propenal (Triose Reductone). The Effects of the pH on the Rate Constants

Article abstract of DOI:10.1246/bcsj.56.467

The autoxidation of 2,3-dihydroxy-2-propenal (triose reductone) was investigated between pH 2.83 and 13.91 in the presence of disodium dihydrogen ethylenediaminetetraacetate (EDTA 2NA).The reaction obeyed the first-order rate law with respect to the triose reductone and the zeroth-order rate law with respect to oxygen when the oxygen concentration was higher than 0.246 mM (1 mM = 10^-3 mol dm^-3) at 30 deg C.The pH dependence of the reaction rates showed that the reaction rates are governed by the acid-base equilibrium of triose reductone.The rate constants for neutral and singly- and doubly-charged anions of triose reductone at 30 deg C were (3.6 +/- 0.1) * 10^-6, (7 +/- 1) * 10^-5, and (1.8 +/- 0.1) * 10^-2 s^-1 respectively.The hydrogen peroxide produced as a result of the triose reductone oxidation was also found to oxidize triose reductone.