Micellar and salt effects on the Ruhemann's purple formation between <img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-lysine and ninhydrin

Abstract

The formation of Ruhemann's purple by the reaction of <img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-lysine and ninhydrin has been studied spectrophotometrically in CTAB and CPB micellar systems in the absence and presence of some inorganic and organic salts at <i>p</i>H=5.0 and temp.= 70°C. The rate of the reaction is appreciably higher than that in aqueous medium. The enhancement has been explained with the pseudo-phase kinetic model. The dependence of the reaction rate on the nature of the side chain present in <img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-lysine has also been discussed.