12. Penetration Enhancers, Solvents and the Skin

  1. Dennis Douroumis1 and
  2. Alfred Fahr2
  1. Jonathan Hadgraft and
  2. Majella E. Lane

Published Online: 4 FEB 2013

DOI: 10.1002/9781118444726.ch12

Drug Delivery Strategies for Poorly Water-Soluble Drugs

Drug Delivery Strategies for Poorly Water-Soluble Drugs

How to Cite

Hadgraft, J. and Lane, M. E. (2013) Penetration Enhancers, Solvents and the Skin, in Drug Delivery Strategies for Poorly Water-Soluble Drugs (eds D. Douroumis and A. Fahr), John Wiley & Sons Ltd, Oxford, UK. doi: 10.1002/9781118444726.ch12

Editor Information

  1. 1

    School of Science, University of Greenwich, UK

  2. 2

    Friedrich-Schiller University of Jena, Germany

Publication History

  1. Published Online: 4 FEB 2013
  2. Published Print: 21 JAN 2013

ISBN Information

Print ISBN: 9780470711972

Online ISBN: 9781118444726

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Keywords:

  • Skin;
  • Penetration;
  • permeation;
  • Enhancement;
  • Solvents;
  • Hansen solubility parameter

Summary

There are very few excipients which have no effect on the barrier properties of the skin. Vehicle components will enter the stratum corneum and can have a number of interactions with the various components of the skin. In particular, they can interact with the structured skin lipids, they can change the environment of the lipids such that they enhance diffusion of the actives or they can influence the solubility of the actives. Few studies have examined how much of the excipients penetrate, more has been done to show their influence on permeation rates. In this chapter we will review the recent data that has indicated the way in which vehicles can influence concentration profiles of actives within the stratum corneum and how this may affect the subsequent active bioavailability. Although high concentrations of actives may be present in the stratum corneum, recent studies indicate that in certain circumstances, the active may be crystallized and therefore relatively poorly bioavailable. Sophisticated biophysical techniques are being developed to monitor the concentration profiles of both active and excipient within the skin. Future developments will also be discussed.