Association (micellization) and partitioning of aglycon triterpenoids |
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Authors: | Rafat Marjan Fong Kit Wah Goldsipe Arthur Stephenson Brian C Coradetti Samuel T Sambandan T G Sinskey Anthony J Rha Chokyun |
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Institution: | Departamento de Química Física, Universidad de Sevilla, C/Profesor García González 1, 41012 Sevilla, Spain. |
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Abstract: | The reaction between methyl 4-nitrobenzenesulfonate and bromide ions has been studied in mixed single-chain-gemini micellar solutions of n-dodecyltrimethylammonium bromide, DTAB, and dodecyl tricosaoxyethylene glycol ether, Brij(35), with alkanediyl-alpha-omega-bis(dodecyldimethylammonium) bromide, 12-s-12,2Br(-) (s=3,4,5). Kinetic micellar effects show that an increase in the solution mole fraction of the single-chain surfactant, X(single-chain), results in a diminution of the mixed micelles tendency to form spherocylindrical aggregates upon increasing surfactant concentration. The dependence of the surfactant concentration at which the sphere-to-rod transition occurs, C(*), on X(single-chain) showed through kinetic data was in agreement with results obtained by means of fluorescence measurements. |
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