Proton conduction in phosphatidylethanolamine.
The dc conductivity of polycrystalline phosphatidylethanolamine (PE) was measured in the temperature range 60-120 degrees C. Since no conclusive evidence had so far been obtained for the presence of proteon conduction in this phospholipid, hydrogen gas was shown in the present experiment to evolve during the electrolysis in its premelted state between 91 and 124 degrees C. In this temperature range molecules assume rotation around the molecular axes and proton conduction of the Grotthus type takes place possibly along two chains of intermolecular hydrogen bonds running in parallel. Zwitter-ions behave cooperatively as proton donors and acceptors in transferring proton from molecule and molecule via the hydrogen bond networks. This efficient push-pull way of proton transferring seems to account for the fact that no polarization was observed in the dc conduction experiments. The amount of devolved gas appears to be not exactly in accordance with Faraday's law and discussions are made on possible causes for this slight deviation.
D004553:Electric Conductivity; D004579:Electron Transport; D006860:Hydrogen Bonding; D008567:Membranes, Artificial; D008968:Molecular Conformation; D010714:Phosphatidylethanolamines; D013696:Temperature
D008567:Membranes, Artificial; D010714:Phosphatidylethanolamines