Abstract
The influence of Li+, Na+, K+, and Cs+ ions on the characteristics and properties of Black Lipid Membranes (BLM) made of diphytanoylphosphatydilcholine (DPhPC), with thickness thinner than 10 nm, were investigated using electrochemical impedance spectroscopy (EIS). The impedance spectra of the base system including the film and its adjacent chloride ion containing aqueous solutions exhibited for all tested cations a single capacitive contribution. The corresponding time constant can be discussed in terms of a model which includes a dielectric dispersion in the membrane. BLM films doped with a low concentration of Gramicidin A have exhibited values of conductance in contact with electrolytes contain ing different cations at low aqueous concentration of Gramicidin A, that indicate ionic transference from one side to the other of the membrane. This phenomenon was detected by using either dc or ac voltage perturbations. Data obtained using EIS techniques show two time constants, which can be assigned to the membrane and to the channel/membrane contributions, respectively.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.