Kinetics and mechanism of the oxidation of amino acids by peroxomonosulphate. Part 2. Effect of formaldehyde

Abstract

The kinetics of oxidation of amino acids (S) by peroxomonosulphate (PMS) in the presence of the formaldehyde (SH) were studied. Analysis of the results shows that the rate of oxidation can be represented by equation (i), at constant [H⁺]. The effect of hydrogen ion on the rate and thermodynamic, –d[PMS]/dt=k′[S][SH][PMS]+k″[SH][PMS](i) parameters was also calculated. Perusal of the kinetic results shows that the first step in the reaction of amino acids with PMS in the presence of formaldehyde is the formation of a Schiff's base. This Schiff's base reacts more rapidly with PMS in the rate-determining step to give the products. The mechanism of the reaction is also discussed in terms of kinetic results.