Abstract
A method is described for comparing the solubilization of heptanol in solutions of sodium cholate, sodium deoxycholate, and sodium dodecyl sulfate. Based on a vapor pressure technique, the measurements allow determination of the fraction of alcohol in the micellar pseudophase compared to the amount in the aqueous solution. The results indicate dodecyl sulfate has significantly greater solubilizing ability for heptanol than the bile salts. The bile salts show deviation from the two-phase model of solubilization which in part is explained by the presence of nonsolubilizing aggregates at low concentrations of surfactant. The nature of the micellar aggregations equilibria seems to play a role in the observed solubilization behavior.
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