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Related Experiment Videos

Liquid-liquid emulsification by static mixers for use in microencapsulation

Y F Maa1, C Hsu

  • 1Department of Pharmaceutical Research and Development, Genentech, Inc., South San Francisco, CA 94080, USA.

Journal of Microencapsulation
|July 1, 1996
PubMed
Summary

Static mixers offer a feasible method for liquid-liquid emulsification in microencapsulation, enabling predictable microsphere size control. This study developed a quantitative correlation linking microsphere size to process parameters for scalable production.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Pharmaceutical Technology

Background:

  • Microencapsulation relies on controlled droplet formation for effective drug delivery.
  • Static mixers present a novel approach for liquid-liquid emulsification compared to traditional stirred tanks.
  • Understanding the relationship between process parameters and particle size is crucial for reproducible microencapsulation.

Purpose of the Study:

  • To investigate the feasibility of using static mixers for liquid-liquid emulsification in microencapsulation.
  • To develop a quantitative correlation between microsphere size and key process parameters.
  • To compare the performance of static mixers with conventional continuously stirred-tank reactors.

Main Methods:

  • Feasibility study of liquid-liquid emulsification using three different static mixer designs (1/4", 1/2", 1").

Related Experiment Videos

  • Evaluation of operational variables and physical properties of dispersion and dispersed phases.
  • Application of dimensional analysis to establish a correlation for poly(lactic acid-co-glycolid acid) and poly(methyl methacrylate) microspheres.
  • Assessment of mixing efficiency and particle-size distribution.

    • Main Results:

    • Static mixers demonstrated effective liquid-liquid emulsification for microencapsulation.
    • A quantitative correlation was established, accurately predicting microsphere size based on process parameters.
    • The developed correlation was validated for both protein-free and protein-loaded microspheres.
    • Static mixers showed comparable or superior performance to continuously stirred-tank reactors in certain aspects.

    Conclusions:

    • Static mixers provide a viable and scalable technology for microencapsulation processes.
    • The established correlation offers an empirical basis for large-scale production of microspheres with controlled sizes.
    • This study lays the groundwork for optimizing static mixer applications in pharmaceutical and materials science.