Kinetics and Mechanism of Oxidation of GSH by vanadium(V) in Aqueous hydrochloric acid medium
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 10
Abstract
The kinetics and oxidation of glutathione (reduced) (GSH) by vanadium(V) has been studied over the range 0.5 ≤ 102 [GSH]T ≤ 2.0, 0.5 ≤ [H+ ] ≤ 3.0, I = 3.1 mol dm-3 and 298 ≤ T ≤ 313K in aqueous hydrochloric acid medium. The reaction showed first order dependence in [V(V)]T, first order with respect to [H+ ] and fractional order with respect to [GSH]T. The main product of the reaction is GSSG a dimer of GSH. In this reaction, one mole of vanadium(V) consumes one mole of GSH. Increase in hydrochloric acid concentration increases the rate. The activation parameters ΔH# (kJ mol-1 ) and ΔS# (JK-1 mol-1 ) for the electron transfer reaction were found to be -22.46 and -371.8. The negative values of activation parameters favor the formation of ordered transition state.
Authors and Affiliations
M. Sanjana, A. K. Patnaik, P. Mohanty, S. K. Badamali
Keywords
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