The dependence of the reaction rate on [Gly-Tyr] was determined by carrying out the kinetic runs at different concentrations of Gly-Tyr (keeping [ninhydrin] (6.0 × 10−3 mol dm−3), temperature (70 °C), and pH (5.0) constant) in both aqueous and micellar media (Table 1). As the kobs and kψ values were independent of initial concentration of Gly-Tyr, the order of reaction with respect to [Gly-Tyr] is confirmed to be unity in both the media.