[Ion permeability of bilayer membranes formed from synthetic phospholipids in the phase transition region].

Ion permeability of black lipid membranes formed from synthetic phospholipids has been studied. The resistance of BLM formed from phosphatidylcholine, tiophosphatidylcholine, threealkylphosphate and threealkyltiophosphate was 10(7)--10(8) Ohm.cm2. It was shown that the membrane potential of the 10--30 mV arised in KCl gradient indicating the preference cation conductance in synthetic lipid membranes. A sharp decrease of the membrane conductance near to the phase transition temperature was discovered. The change of conductance by phase transition temperature was sensitive to chemical nature of the polar head of phospholipids used.