Abstract
Cyclodextrins offer the potential of modulating protein–surfactant interactions. In our work, the effect of cyclodextrin (CD) on the interaction between bovine serum albumin (BSA) and the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) has been studied by isothermal titration calorimetry (ITC), fluorescence spectra and circular dichroism measurements. The presences of cyclodextrin can slightly hinder the strong interactions between BSA and SDBS by the combination of electrostatic and hydrophobic interactions between BSA and SDBS. Furthermore, the effectiveness of α-CD is lower than that of β-CD, due to the lower association constant between α-CD and surfactant. The presence of both α- and β-CD totally hinders the nonspecific interactions between BSA and SDBS, because the hydrophobic interaction between cyclodextrin and surfactant is stronger than that between BSA and surfactant.
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