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Iontophoretic transport across the skin
R H Guy1, M B Delgado-Charro, Y N Kalia
1Centre interuniversitaire de recherche et d'enseignement, Universities of Geneva and Lyon, Pharmapeptides, Campus universitaire, Archamps, France. richard.guy@pharm.unige.ch
Skin Pharmacology and Applied Skin Physiology
|August 18, 2001
Summary
Understanding drug delivery via iontophoresis is complex. This study reveals that cationic drug transport through electromigration is significantly influenced by molecular size, offering new research directions.
Area of Science:
- Pharmacology
- Drug Delivery
- Physical Chemistry
Background:
- Passive drug diffusion across the skin is well-understood, with lipophilicity and molecular volume being key factors.
- Predictive models for passive percutaneous permeability are established.
- The mechanisms governing iontophoresis, particularly drug transport, remain less defined.
Purpose of the Study:
- To investigate the influence of molecular and physicochemical properties on drug transport during iontophoresis.
- To clarify the roles of electromigration and electroosmosis in iontophoretic drug delivery.
- To establish predictive relationships for iontophoretic drug transport efficiency.
Main Methods:
- Analysis of a combined literature and in-house experimental database.
- Experimental separation of electromigration and electroosmosis.
- Evaluation of physicochemical parameters influencing drug electrotransport.
Main Results:
- The efficiency of cationic drug delivery via electromigration demonstrates a strong dependence on molecular size.
- Electromigration and electroosmosis mechanisms are being increasingly understood and differentiated.
- Initial findings suggest molecular size is a critical determinant for electromigration-based drug transport.
Conclusions:
- Molecular size is a critical factor influencing cationic drug delivery through electromigration.
- Further research is needed to fully elucidate the mechanisms of iontophoresis and optimize drug delivery.
- The established relationships provide a basis for future investigations into iontophoretic drug transport.