Influence of twin-headed gemini micellar system on the study of methionine amino acid with ninhydrin in buffer solution

Abstract

The influence of double-headed gemini was examined in the present study by studying the amino acid methionine mixed with ninhydrin in CH 3 COOH-CH 3 COONa buffer solvent. The absorbance was monitored at fixed time intervals with UV-vis spectroscopy. An impact typical of surfactants was observed on the ninhydrin–methionine reaction and explained by a pseudo-phase model of micelles. The effect of different temperatures (343 to 363 K) was also determined. Based on data showing the impact of temperature on k ψ , several relevant thermodynamic quantities, Δ H # , Δ S # , and E a , were calculated using linear least-squares regression. In addition, the influence of the other reaction ingredients on the reaction, that is, pH and the concentration of ninhydrin and methionine, was studied. The CMC (critical micelle concentration) of pure geminis and the surfactant system with methionine and ninhydrin was evaluated at two temperatures, i.e. at 303 K and 353 K by conductivity measurements. The CMC values of pure gemini surfactants evaluated in the existing case at 303 K are concordant with the results stated before. Moreover, other parameters, including rates and binding constants, were calculated.

Effect of Quaternary Ammonium Gemini Surfactant Solution on the Rate Constant of the Ninhydrin–Lysine Reaction

“…The nin-comprising reactions with amine functionality have been discussed and accounted carefully at many places reported, previously. − Prior to observing kinetic values in quaternary ammonium geminis, it is noteworthy to understand the mechanism of Lys and nin in an aqueous system. Therefore, on the basis of present outcomes and investigations, a plausible mechanism between Lys and nin is provided (Scheme ).…”

Study on the association and phase separation behavior of surfactants and promethazine hydrochloride: impact of ammonium electrolytes

“…The conductivity ( κ ) was assessed by adding concentrated solutions one at a time into either a set concentration of additive (H 2 O + PMH (3 mmol kg −1 ) + NH 4 Cl/NH 4 NO 3 /(NH 4 ) 2 SO 4 ) solutions based on the literature. 46–48 The desired temperature of the solutions was sustained by utilizing a thermostated water bath (JSRC-13C, Korea). The micelle development concentration (CMC) is determined from the break point acquired in the κ vs. [surfactant] plots.…”

“…The conductivity measurements were carried out by applying a conductivity meter (Jenway 4510, UK) tted with a dip cell (cell constant = 0.97 cm −1 ) at various compositions and temperatures (298. 15 [46][47][48] The desired temperature of the solutions was sustained by utilizing a thermostated water bath (JSRC-13C, Korea). The micelle development concentration (CMC) is determined from the break point acquired in the k vs.…”

Association behavior and physico-chemical parameters of a cetylpyridinium bromide and levofloxacin hemihydrate mixture in aqueous and additive media

“…However, the expected growth of k values deviated from the former trend aer reaching a certain CPB concentration, which is recognized as the critical micelle concentration (CMC). 55,56 Thus, clear breakpoints in the k vs.…”