Abstract

The kinetics of carbonate sugars and sugar alcohols by potassium permanganate in oxidation hydrogen / NaOH buffer have been investigated spectrophotometrically under pseudo-first order conditions and over a wide range of experimental conditions. Each reaction is first order with respect to the substrate and oxidant. The kinetic data for the oxidation by alkaline KMnO₄ solution reveal that pseudo-first order rate constants increased as the pH, Ionics strenghts, temperature as well as the KMnO₄ concentration increased. The rate constant also increases with increase in sugar concentration with the exception of sorbitol which its rate constant decreased with increase in sugar concentration. The mechanisms were found to proceed through the formation of enediol intermediate complex. The order of reactivities of sugar and sugar alcohols was sucrose > maltose > sorbitol > glucose> mannitol >fructose. The Arrhenius activation energy and other dynamic activation parameter are reported.

Keywords: KMnO₄ (Potassium permanganate), pseudo-first order (K_obs), activation, oxidation, reactivities, mechanism.