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Higuchi equation: derivation, applications, use and misuse.

Juergen Siepmann1, Nicholas A Peppas

  • 1Univ. Lille Nord de France, College of Pharmacy, 3 Rue du Professeur Laguesse, 59006 Lille, France. juergen.siepmann@univ-lille2.fr

International Journal of Pharmaceutics
|April 5, 2011
PubMed
Summary
This summary is machine-generated.

This review celebrates the 50th anniversary of the Higuchi equation, a simple yet powerful tool for quantifying drug release from films. It explains the equation's assumptions, applications in drug delivery, and potential misuse.

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Area of Science:

  • Pharmaceutical Sciences
  • Chemical Engineering
  • Materials Science

Background:

  • The Higuchi equation, developed 50 years ago, quantifies drug release from thin films into a perfect sink.
  • It simplifies complex mass transport processes using a pseudo-steady-state approach.

Purpose of the Study:

  • To commemorate the 50th anniversary of the Higuchi equation.
  • To review the assumptions, applications, and potential misuse of the Higuchi equation and related theories.
  • To highlight the equation's utility in optimizing drug delivery devices and understanding release mechanisms.

Main Methods:

  • Review of the classical Higuchi equation derivation and its underlying assumptions.
  • Analysis of the pseudo-steady-state approach and square root of time kinetics.
  • Exploration of the equation's applicability to various drug delivery systems.

Main Results:

  • The Higuchi equation demonstrates a direct proportionality between cumulative drug release and the square root of time.
  • The equation's constant of proportionality has a specific, physically realistic meaning.
  • The equation is applicable beyond thin ointment films to transdermal patches and oral films.

Conclusions:

  • The Higuchi equation remains a valuable tool for drug delivery research and development.
  • Understanding its assumptions and limitations is crucial for appropriate application.
  • Extensions and related theories broaden its utility in advanced drug delivery systems.