The effect of cationic conventional surfactants myristyltrimethylammonium bromide (TTAB), cetyltrimethylammonium bromide (CTAB),
and cetylpyridinium chloride (CPC) on the interaction of dipeptide glycyl-alanine (Gly-Ala) with ninhydrin has been studied
spectrophotometrically under different conditions. The reaction rates are higher in the presence of surfactants but the reaction order remains
the same in both the media (first- and fractional-order with respect to [Gly-Ala] and [ninhydrin]). Quantitative kinetic analyses of
kψ[surfactant] data were performed on the basis of pseudo-phase model of the micelles (proposed by Menger and Portnoy and developed
by Bunton and Romsted) and Piszkiewicz model wherein the micellar binding constants KS for Gly-Ala and KN for ninhydrin with
surfactant micelles were evaluated. The catalytic efficiency in TTAB increased by added electrolytes which had been discussed in detail
د. عادل أحمد محمد سعيد | Dr. Adel Ahmed Mohammed Seaad | 13975