Abstract
AbstractIn this paper we report the effect of dicationic ‘gemini’ surfactants (CH3)2C16H33N+ (CH2)mN+C16H33(CH3)2, 2Br− (where m = 4, 5, 6) on the reaction of ninhydrin with DL‐tryptophan. The gemini surfactant micellar media are comparatively more effective than their conventional monomeric counterpart cetyltrimethylammonium bromide (CTAB) micelles. Also, whereas typical rate constant (kψ) increase and leveling‐off regions, just like CTAB, are observed with geminis, the latter produce a third region of increasing kψ at higher concentrations. These subsequent increases are ascribed to changes in micellar morphologies, consistent with changes in 1H NMR line widths. Quantitative kinetic analysis of the rate constant–[surfactant] data has been performed on the basis of modified pseudophase model. Copyright © 2007 John Wiley & Sons, Ltd.
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