Kinetic Studies On The Oxidation Of Ninhydrin Amino Acid Systems Using Alkaline Permanganate

The of kinetics of oxidation Ruheman’s Purple by aqueous alkaline permanganate inrnalkaline medium at a constant ionic strength has been studied spectrophotometrically.rnThe oxidation process in alkaline medium under the conditions employed in the presentrninvestigation proceeds initially through the formation of an RP-permanganate complex,rnwhich again rearranges it self to form an other complex. The latter complex decomposesrninto products up on reacting with alkali in fast stage of the reaction. The reactionrnconstants involved in the mechanism were derived. There is good agreement between thernexperimental and calculated rate constants under different experimental condition. Thernreaction between permanganate and Ruheman’s Purple in alkaline medium exhibits 1:2rnstoichiometry (Ruheman’s Purple: KMnO4). The reaction shows first order dependencernon [permanganate] and apparent less than unit order dependence each on Ruhemann’srnPurple and alkali concentrations. Reaction rate increases with increase in ionic strengthrnand decrease in solvent polarity of the media. Initial addition of reaction products did notrnaffect the rate significantly. A mechanism of reaction involving the oxidant and substraternhas been proposed. The activation parameters were computed with respect to the slowrnstep of the mechanism and discussed.

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