Abstract
Effects of α-, β-and γ-cyclodextrin (CD) on the removal of a mixed oily soil consisting of triolein and cholesterol were investigated. While the removal of the soil by sodium dodecyl sulfate, SDS, increased gradually with the washing time, the removal by the CD's was independent. The removal by β-and γ-CD increased with the concentration, resulting in the order of the effectiveness, γ-CD> β-CD >α-CD≈slight at 15 mM.
Addition of the CD's to the solution of SDS shifted the critical micelle concentration (cmc) to higher concentrations. The effect of the CD's was observed on the removal of the soil by the mixed solution at higher concentrations than cmc of the solution. The effects were in the order, γ-CD>β-CD>α-CD≈0.β-CD removed selectively cholesterol in the mixed soil.
A two-step washing consisting of washing first with SDS and then with CD showed a better performance than that with CD-SDS mixed solution.
