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Cationic-surfactant transfer facilitated by DNA adsorbed on a polarized 1,2-dichloroethane/water interface

The voltammetric behaviour of high-molecular-weight DNA at a polarized 1,2-dichloroethane/water (DCE/W) interface was investigated in the presence of a cationic surfactant, dimethyldistearylammonium in DCE. A well-developed adsorption wave was obtained for salmon sperm DNA (purified) and herring sperm DNA (commercial and purified). The peak current showed a Langmuir-type dependence on the DNA concentration. The half-peak width was relatively small (∼30 mV). To explain the voltammetric behaviour, a reaction model was proposed, in which the transfer of surfactant ions from DCE to W is facilitated by DNA adsorbed on the DCE/W interface. Theoretical simulation of the voltammetric wave was performed by assuming a Frumkin isotherm for the DNA–surfactant binding. When the interaction parameter g′ was set to be 2, the theoretical value (38 mV) for the half-peak width was closest to the experimental value of ∼30 mV. The g′ value of 2 suggested that there were strongly attractive interactions among the surfactant ions on DNA.