Inclusions of methylene blue and phenothiazine by β-cyclodextrin in sodium dodecyl sulfate micelles

The inclusions of methylene blue and phenothiazine by β-cyclodextrin (β-CD) in sodium dodecyl sulfate (SDS) micelles and SDS/n-C₅H₁₁OH mixed micelles are studied by fluorescence spectroscopy. β-CD molecules can include monomers of methylene blue only after they have included SDS at a ratio of 1:1. However, phenothiazine can be included in the β-CD cavities even with β-CD concentrations lower than the total SDS concentration in SDS micelles, but not for solutions with SDS/n-C₅H₁₁OH mixed micelles.