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http://dx.doi.org/10.5012/jkcs.2014.58.4.351

Inhibitory Effect of {Surfactant- MnO4-} Aggregation in KMnO4 Oxidation of Proline and Methionine: A Kinetic Study  

Tripathi, Ritu (Department of Chemistry, H.B. Technological Institute)
Upadhyay, Santosh K. (Department of Chemistry, H.B. Technological Institute)
Publication Information
Journal of the Korean Chemical Society / v.58, no.4, 2014 , pp. 351-358 More about this Journal
Abstract
Anionic (sodium lauryl sulphate, NaLS) cationic (cetyl ammonium bromide, CTAB) and non-ionic (Tween-80) surfactants have been found to inhibit the rate of oxiadation L-proline and L-methionine by alkaline $KMnO_4$. A first order dependence of rate of oxidation was observed with respect to $MnO_4{^-}$. The order of reaction in substrate and alkali was found to be fractional nearby 0.65 and 0.55 in Aminoacid and $OH^-$, respectively. An aggregation/association between $MnO_4{^-}$ and surfactant has been confirmed spectrophotometrically. A mechanism, involving kinetically inactive [$MnO_4{^-}$ surfactant] aggregate and consistent with kinetic data, has been proposed. The effect of surfactants has been discussed in terms of hydrophobic and electrostatic interactions.
Keywords
Inhibition; Surfactants; $KMnO_4$; Proline; Methionine;
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