Brij-35 micellar catalysed chloramine-T oxidation of vitamins: A kinetic study

Abstract

The kinetics of oxidation of the vitamins (B₁ and B₆) by sodium salt of p-toluene sulfonamide (Chloramine-T) have been studied in presence of a non-ionic surfactant, i.e., polyoxyethylene(23)laurylether (Brij-35) in perchloric acid medium. Catalytic effect of Brij-35 micelle has been observed on the rate of oxidation. The reactions show first order, fractional order and zero-order dependence of rate with respect to chloramine-T, vitamins and HClO₄, respectively. The mechanism in absence as well as in presence of surfactant has been proposed. The spectrophotometric evidence supports the binding/association between chloramine-T and Brij-35 micelle. The kinetic data have also been rationalised in terms of Menger and Portnoy’s kinetic model and binding parameters have been evaluated.