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Related Experiment Videos

In vitro iontophoretic studies using a synthetic membrane.

Y H Tu1, L V Allen

  • 1University of Oklahoma Health Sciences Center, College of Pharmacy, Oklahoma City 73190.

Journal of Pharmaceutical Sciences
|March 1, 1989
PubMed
Summary

Iontophoresis effectively enhanced drug transport for ionized medications like dexamethasone sodium phosphate across membranes. However, this method showed no significant effect on non-ionized drugs, indicating electric fields favor charged molecules.

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Area of Science:

  • Pharmacology
  • Materials Science
  • Biomedical Engineering

Background:

  • Drug delivery systems are crucial for therapeutic efficacy.
  • Iontophoresis offers a non-invasive method for transdermal drug administration.
  • Membrane properties significantly influence drug transport.

Purpose of the Study:

  • To investigate the efficacy of in vitro iontophoresis for delivering ionized and non-ionized drugs.
  • To evaluate the effect of electric current on transmembrane drug transport rates.
  • To determine the relationship between applied current and drug transport for different corticosteroids.

Main Methods:

  • Utilized a microporous polyolefin membrane with hydrophilic polymer-filled pores.
  • Administered ionized drugs (dexamethasone sodium phosphate, hydrocortisone sodium phosphate, prednisolone sodium succinate) and a non-ionized drug (cortisone acetate) via iontophoresis.

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  • Applied currents ranging from 0.2 to 0.8 mA and compared transport rates to passive diffusion.

    • Main Results:

    • Iontophoresis significantly increased transmembrane transport rates for all ionized drugs compared to passive diffusion.
    • Applied currents did not significantly affect the transport rate of the non-ionized drug, cortisone acetate.
    • A linear relationship was observed between applied current and transport rate for ionized drugs.

    Conclusions:

    • In vitro iontophoresis is effective for enhancing the transdermal delivery of charged drug molecules.
    • Electric fields demonstrate greater efficiency in interacting with charged molecules than uncharged ones.
    • This study highlights the potential of iontophoresis for targeted drug delivery of specific ionized pharmaceuticals.