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- W2024999370 abstract "Abstract The effect of dicationic gemini surfactants H 33 C 16 (CH 3 ) 2 N + ‐(CH 2 ) s ‐N + (CH 3 ) 2 C 16 H 33 , 2Br − ( s = 4, 5, 6) on the reaction of a dipeptide glycyl–tyrosine (Gly–Tyr) with ninhydrin has been studied spectrophotometrically at 70°C and pH 5.0. The reaction follows first‐ and fractional‐order kinetics, respectively, in [Gly–Tyr] and [ninhydrin]. The gemini surfactant micellar media are comparatively more effective than their single chain–single head counterpart cetyltrimethylammonium bromide (CTAB) micelles. Whereas typical rate constant ( k Ψ ) increase and leveling‐off regions, just like CTAB, are observed with geminis, the latter produces a third region of increasing k Ψ at higher concentrations. This subsequent increase is ascribed to the change in the micellar morphology of the geminis. The pseudophase model of micelles was used to quantitatively analyze the k Ψ − [gemini] data, wherein the micellar‐binding constants K S for [Gly–Tyr] and K N for ninhydrin were evaluated. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 800–809, 2012" @default.
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- W2024999370 date "2012-10-25" @default.
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- W2024999370 title "Effect of dicationic gemini surfactants 16-<i>s</i>-16 (<i>s</i>= 4, 5, 6) on the ninhydrin-dipeptide (glycyl-tyrosine) reaction" @default.
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- W2024999370 doi "https://doi.org/10.1002/kin.20731" @default.
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