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KMID : 1059520140580040351
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Journal of the Korean Chemical Society
2014 Volume.58 No. 4 p.351 ~ p.358
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Inhibitory Effect of {Surfactant- MnO4-} Aggregation in KMnO4 Oxidation of Proline and Methionine: A Kinetic Study
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Tripathi Ritu
Upadhyay Santosh K.
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Abstract
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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 KMnO4. A first order dependence of rate of oxidation was observed with respect to MnO4 -. 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 MnO4 - and surfactant has been confirmed spectrophotometrically. A mechanism, involving kinetically inactive [MnO4 - surfactant] aggregate and consistent with kinetic data, has been proposed. The effect of surfactants has been discussed in terms of hydrophobic and electrostatic interactions.
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KEYWORD
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Inhibition, Surfactants, KMnO4, Proline, Methionine
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