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Inter-pulse interval between rectangular voltage pulses affects electroporation threshold of artificial lipid

Alenka Macek Lebar1, Gregory C Troiano, Leslie Tung

  • 1University of Ljubljana, Faculty of Electrical Engineering, SI-1000 Ljubljana, Slovenia.

IEEE Transactions on Nanobioscience
|May 16, 2006
PubMed
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Shortening the interval between electrical pulses significantly lowers the electroporation threshold for lipid membranes. This effect, observed with 1-palmitoyl-2-oleoyl-phosphatidylcholine bilayers, suggests potential for enhanced electroporation efficiency.

Area of Science:

  • Biophysics
  • Membrane Electroporation
  • Lipid Bilayer Dynamics

Background:

  • Electroporation is a key technique for altering membrane permeability.
  • Understanding the impact of pulse parameters on electroporation is crucial for optimizing its application.
  • The inter-pulse interval's effect on electroporation threshold in lipid bilayers remains an area for detailed investigation.

Purpose of the Study:

  • To investigate how the inter-pulse interval (IPI) between rectangular electrical pulses affects the electroporation threshold of 1-palmitoyl-2-oleoyl-phosphatidylcholine (POPC) bilayer lipid membranes.
  • To quantify the relationship between IPI and the threshold voltage required for electroporation.
  • To determine the influence of pulse train parameters on the location and likelihood of membrane rupture.

Main Methods:

Related Experiment Videos

  • Experiments were conducted on POPC bilayer lipid membranes exposed to trains of sixteen 100-microsecond (µs) duration pulses.
  • The threshold voltage for electroporation was recorded for six different inter-pulse intervals: infinity, 1000 µs, 100 µs, 10 µs, 1 µs, and 0 µs.
  • The sequence number of the pulse initiating electroporation was noted for each IPI condition.

Main Results:

  • The electroporation threshold voltage decreased linearly with the logarithm of the inter-pulse interval.
  • At an IPI of 1 µs, the electroporation threshold was equivalent to that of a single pulse with a duration equal to the sum of all pulses in the train (1600 µs).
  • Bilayer rupture occurred with nearly equal frequency across all pulses in the train at a 1 µs IPI, whereas at IPIs exceeding 1 µs, rupture was more probable in the earlier pulses.

Conclusions:

  • A train of electrical pulses applied with a short inter-pulse interval (less than 1 millisecond) can significantly reduce the electroporation threshold of bilayer lipid membranes.
  • The cumulative effect of pulses at short IPIs enhances membrane destabilization, leading to lower required voltages for electroporation.
  • These findings have implications for optimizing electroporation protocols in various biological and medical applications.