Surfactant enhanced flow injection chemiluminescence method for vitamin D3 determination in pharmaceutical formulations

Khan, Fatima; Yaqoob, Mohammad; Ali, Salamat; Waseem, Amir; Nabi, Abdul

doi:10.1016/j.saa.2018.10.001

Cited by 9 publications

(1 citation statement)

References 26 publications

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“…Aggregation structures generated by surfactants have gained remarkable attention owing to their unique phenomenon. − Due to their extraordinary behavior, − surfactants are engaged in diverge functions for several research purposes including industrial studies. They are employed in many sectors of fundamental as well as advanced applications. − The binding interaction of some active organic molecules with surfactants has been reported and displayed great importance in the arenas of surface chemistry. − Surfactants also work as a simple pseudophase model in several studies conducted by many potential investigators through micelle-involved reactions. − …”

Section: Introductionmentioning

confidence: 99%

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

Kumar,

Khan,

Posa

et al. 2023

Ind. Eng. Chem. Res.

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The effect of solutions of double-chained quaternary ammonium gemini surfactants (16-s-16, s = 4−6) was characterized on the rate constant of the ninhydrin (nin) and lysine (Lys) reaction using a ultraviolet−visible (UV−vis) spectrophotometer. Rate constant (k ψ ) values were obtained at different geminis. However, k ψ values obtained at several geminis were displayed in the form of the k ψ −[gemini] rate profile, and the quantitative estimation of these results was elucidated employing a model of micellar catalysis referred to as pseudophase. The role of other experimental ingredients such as nin, Lys, pH, and temperature (T) was examined in geminis, and k ψ values as a function of these parameters were determined. Data treatment confirms a fractional order in [nin] and a unity order in [Lys]. Using conductometric evaluation, the critical micellar concentration (cmc) of pure double-chained gemini surfactants (16−6−16, 16−5−16, and 16−4−16) and presence of nin and Lys were recorded. Results of the present experimental value were used to determine micellar binding constants (K A for Lys and K B for nin). The binding constants and second-order rate (k m ) affect the solvent properties at the micellar surface and hence are taken into consideration and discussed.

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