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Pharmaceutical Manufacturing Handbook: Production and

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5.10<br />

MICROEMULSIONS AS DRUG<br />

DELIVERY SYSTEMS<br />

Raid G. Alany <strong>and</strong> Jingyuan Wen<br />

The University of Auckl<strong>and</strong> Auckl<strong>and</strong>, New Zeal<strong>and</strong><br />

Contents<br />

5.10.1 Historical Background, Terminology, <strong>and</strong> Defi nition<br />

5.10.2 Structure <strong>and</strong> Formation of Microemulsion Systems<br />

5.10.3 Role of Cosurfactants/Cosolvents in Formation <strong>and</strong> Stabilization of Microemulsion<br />

Systems<br />

5.10.4 <strong>Pharmaceutical</strong> Formulation of Microemulsions<br />

5.10.4.1 Selection of Microemulsion Ingredients<br />

5.10.4.2 Phase Behavior Studies<br />

5.10.5 Techniques Used to Characterize Microemulsions <strong>and</strong> Related Systems<br />

5.10.5.1 Polarized Light Microscopy<br />

5.10.5.2 Transmission Electron Microscopy<br />

5.10.5.3 Electrical Conductivity Measurements<br />

5.10.5.4 Viscosity Measurements<br />

5.10.5.5 Other Characterization Techniques<br />

5.10.6 Microemulsions as Drug Delivery Systems<br />

5.10.6.1 Oral Drug Delivery<br />

5.10.6.2 Transdermal Drug Delivery<br />

5.10.6.3 Parenteral Drug Delivery<br />

5.10.6.4 Ocular Drug Delivery<br />

5.10.7 Concluding Remarks<br />

References<br />

5.10.1 HISTORICAL BACKGROUND, TERMINOLOGY,<br />

AND DEFINITION<br />

Hoar <strong>and</strong> Schulman coined the term microemulsion (ME) in 1943 to defi ne a transparent<br />

system obtained by titrating a turbid oil - in - water (o/w) emulsion with a<br />

<strong>Pharmaceutical</strong> <strong>Manufacturing</strong> <strong>H<strong>and</strong>book</strong>: <strong>Production</strong> <strong>and</strong> Processes, edited by Shayne Cox Gad<br />

Copyright © 2008 John Wiley & Sons, Inc.<br />

769

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