Role of cetyltrimethylammonium bromide (CTAB) surfactant micelles on kinetics of [Zn(II)-Gly-Leu]+ and ninhydrin

At present work, role of cetyltrimethylammonium bromide (CTAB) surfactant micelles on kinetics of zinc-glycylleucine [Zn(II)-Gly-Leu](+) and ninhydrin has been studied. The effect of different variables, viz., ninhydrin, [Zn(II)-Gly-Leu](+) complex, temperature and pH was also undertaken on the title reaction. Role of CTAB on kinetics of complex and ninhydrin has been carried out using spectrophotometric technique. CTAB was observed more efficient for the [Zn(II)-Gly-Leu](+) and ninhydrin reaction than aqueous. The rate constant k(psi)-values enhanced with increase in [CTAB] from 0 to 50 mol dm(-3) and further increase has a slow decrease in rate. Conductometric technique was used to evaluate critical micelle concentration (cmc) of surfactant. The relationship of rate constant (k(psi)) with CTAB concentration was discussed and described in sufficient details. Analysis of kinetic data was rationalized in terms of model of surfactant micelles (pseudo-phase). Various parameters have also been evaluated including thermodynamic and binding constant. (C) 2018 Elsevier B.V. All rights reserved.