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Interaction of ninhydrin with zinc(II) complex of tryptophan in the three dicationic gemini surfactants


Present work concerns with the interaction of ninhydrin with zinc(II) complex of tryptophan ([Zn(II)-Trp]+) in the three dicationic gemini surfactant systems. To record critical micellar concentration (CMC) and absorbance, we have used Systronics conductivity meter and UV-visible spectrophotometer, respectively. Experiment opens up the fractional- and first-order paths in ninhydrin and complex, respectively. Gemini micellar medium is found more superior over aqueous medium. Rate constant (kψ) vs. [gemini] plot shows the unusual role of geminis on kψ. kψ increases with gemini concentration (at concentrations lower than the CMC, part I) and leveling-off regions obtain (concentration up to 400 × 10−5 mol dm−3, part II). Characteristics of part I and part II are just the same as that of conventional surfactant. Later, gemini produces a third region of increasing kψ at higher concentrations ([gemini] > 400 × 10−5 mol dm−3, part III). Detail and systematic elucidation about the effect of surfactants are mentioned and discussed in the text. Binding constants (KS for [Zn(II)-Trp]+ and KN for ninhydrin) and rate constant (km in geminis) were determined by nonlinear least squares regression technique. The kinetic results acquired can reasonably be interpreted by pseudo-phase model of surfactant micelles.

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This project was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant No. (DF-071-130-1441). The authors, therefore, gratefully acknowledge DSR technical and financial support.

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Correspondence to Dileep Kumar.

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Rub, M.A., Kumar, D. Interaction of ninhydrin with zinc(II) complex of tryptophan in the three dicationic gemini surfactants. Colloid Polym Sci 297, 1519–1527 (2019).

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  • Gemini surfactants
  • Interfaces
  • CMC
  • [Zn(II)-Trp]+
  • Ninhydrin