Analysis of interaction between glutamic acid and ninhydrin in the presence of acetate buffer solvent: Impact of gemini (twin-headed) surfactants

This study analyses the impact of twin-headed gemini surfactants on the interaction between glutamic acid (Glu) and a ninhydrin (Nin) in an acetate buffer. Analyses were observed using a UV-vis spectrophotometer and values of absorbance were recorded at fixed time intermissions. The impact of parameters such as pH, temperature, [Glu], and [Nin] was examined on reaction in gemini surfactants. Using a conductometric technique, electrical conductivities of pure geminis and their mixed systems were noted. Using these data, thus, cmc values of pure geminis and their mixed system were measured. By varying different parameters, the rate constant (k(Psi)-value) was evaluated on finishing each kinetic run using a computer-based procedure. The study showed that twinheaded gemini surfactants demonstrated an excellent impact on the titled reaction over the aqueous system although 16-4-16 catalyzed the study more among geminis and followed the abilities to catalyze at each concentration as 16-4-16 > 16-5-16 > 16-6-16. Our goal was to assess the impact of varied gemini surfactants on rate constant and thus, a pseudo-phase model for micellar activity was applied. A low positive value of Delta H-# with a large negative Delta S-# was obtained in geminis than for aqueous solutions. A probable reaction mechanism is discussed.

Automated summary

This study shows that twin-headed gemini surfactants have a significant impact on the interaction between glutamic acid and ninhydrin in an aqueous system. Among gemini surfactants, 16-4-16 exhibited the strongest catalytic activity, followed by 16-5-16 and 16-6-16. A pseudo-phase model for micellar activity was used to evaluate the impact of different gemini surfactants on the rate constant.