Study the effect of α,β,γ-cyclodextrins on the critical micelles concentration (c.m.c.) of sodium dodecyl sulphate (SDS) by using 1-methyl-4-[4′-aminostyryl]pyridinium iodide

The study of the effect of α,β,γ-cyclodextrins on the critical micelles concentration (c.m.c.) of sodium dodecyl sulphate (SDS) has been carried out by UV–vis spectroscopic measurements. The results reveal that, the complex formation between α,β,γ-cyclodextrins and SDS micelles shifts c.m.c. to higher values depending on the cavity size. It was 1.24 × 10−2, 1.4 × 10−2, and 1.61 × 10−2 mol dm−3 for α,β,γ-cyclodextrins, respectively.