Synergistic barrier effect of phosphatidylcholine and phosphatidic acid on the ion transfer across a polarized liquid–liquid interface and its electrochemical stability

Transfer of the tetraethylammonium cation across a phosphatidic acid layer adsorbed at a water/1,2-dichloroethane interface: The effect of electric polarization of the interface – Electrochemically controlled ion exchange

“…It has been shown in electrochemical measurements that more compact layers adsorbed at liquid/liquid interfaces prevent the potassium ion transfer facilitated by a crown-ether, or at least shift it to more positive potential differences applied to the interface [6,9]. Therefore, the ion transport appears in cyclic voltammetric (CV) measurements as a sharper peak at more positive potential values; the sharpness of the peak is due to the increased rate of the transfer reaction.…”

“…To contribute to description of such cases, the present investigation has been carried out. It has been shown [6] that co-adsorption of dipalmitoyl phosphatidic acid (DPPA) with DPPC increases the density and improves the stability of the phospholipid adsorbed layer. Consequently, the passage through the adsorbed layer should be more difficult for various species, especially for larger ones.…”