Electrochemical studies of interaction between ceyltrimethylammonium bromide and α-, β-cyclodextrins at various temperature

The adsorption of surfactant (S) to cyclodextrin (CD) is studied using ion selective electrodes. The data obtained indicate that inclusion complexes S(CD) and S(CD)2 had formed between cetyltrimethyl ammonium bromide (CTAB) and cyclodextrin in aqueous environment. In addition to 1:1 complexes, surfactants form 1:2 complexes with α and β-cyclodextrin as well. Investigation showed that the (K1) for S(CD), that is the equilibrium constant, is greater than (K2) for S(CD)2. Finally thermodynamic parameters for the process (ΔS0, ΔH0, ΔG0) have been calculated.