The Journal of Membrane Biology

, Volume 48, Issue 2, pp 181–204 | Cite as

Reversible electrical breakdown of lipid bilayer membranes: A charge-pulse relaxation study

  • R. Benz
  • F. Beckers
  • U. Zimmermann
Article

Summary

Charge-pulse experiments were performed with lipid bilayer membranes from oxidized cholesterol/n-decane at relatively high voltages (several hundred mV). The membranes show an irreversible mechanical rupture if the membrane is charged to voltages on the order of 300 mV. In the case of the mechanical rupture, the voltage across the membrane needs about 50–200 μsec to decay completely to zero. At much higher voltages, applied to the membrane by charge pulses of about 500 nsec duration, a decrease of the specific resistance of the membranes by nine orders of magnitude is observed (from 108 to 0.1 Ω cm2), which is correlated with the reversible electrical breakdown of the lipid bilayer membrane. Due to the high conductance increase (breakdown) of the bilayer it is not possible to charge the membrane to a larger value than the critical potential differenceVc. For 1m alkali ion chloridesVc was about 1 V. The temperature dependence of the electrical breakdown voltageVc is comparable to that being observed with cell membranes.Vc decreases between 2 and 48°C from 1.5 to 0.6 V in the presence of 1m KCl.

Breakdown experiments were also performed with lipid bilayer membranes composed of other lipids. The fast decay of the voltage (current) in the 100-nsec range after application of a charge pulse was very similar in these experiments compared with experiments with membranes made from oxidized cholesterol. However, the membranes made from other lipids show a mechanical breakdown after the electrical breakdown, whereas with one single membrane from oxidized cholesterol more than twenty reproducible breakdown experiments could be repeated without a visible disturbance of the membrane stability.

The reversible electrical breakdown of the membrane is discussed in terms of both compression of the membrane (electromechanical model) and ion movement through the membrane induced by high electric field strength (Born energy).

Keywords

Cholesterol Electric Field Strength High Electric Field Fast Decay Lipid Bilayer Membrane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc 1979

Authors and Affiliations

  • R. Benz
    • 1
    • 2
  • F. Beckers
    • 1
    • 2
  • U. Zimmermann
    • 1
    • 2
  1. 1.Fachbereich BiologieUniversität KonstanzKonstanzGermany
  2. 2.Institut für Biophysikalische ChemieKernforschungsanlage JülichJülichGermany

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