Journal
TENSIDE SURFACTANTS DETERGENTS
Volume 53, Issue 2, Pages 168-175Publisher
CARL HANSER VERLAG
DOI: 10.3139/113.110422
Keywords
Micellar morphology; geminis; Ninhydrin; rate constant
Funding
- Universiti Tunku Abdul Rahman Research Fund (UTARRF), Malaysia [IPSR/RMC/UTARRF/2014-C2/N02]
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The present work concerns with the effect of alkanediyl-alpha,omega-bis(dimethylcetylammonium bromide) gemini surfactants on the reaction rate of ninhydrin with glycyl-glycine. The spectra showed peaks at 400 nm and 570 nm in aqueous and aqueous-micellar media indicating the formation of the same product. Under pseudo-first-order conditions of excess ninhydrin, the reaction followed an irreversible first-and fractional-order kinetics with respect to [Gly-Gly] and [ninhydrin]. Also, the rate constants (k(psi)) increases and leveling-off regions are found with [geminis] (akin to conventional cetyltrimethylammonium bromide, CTAB), a third-region of increasing k(psi) is observed at higher [geminis]. The kinetic data in gemini micellar medium have been examined with the pseudo-phase model.
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