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Related Experiment Videos

Dynamic changes in size distribution of emulsion droplets during ethyl acetate-based microencapsulation process.

Y Bahl1, H Sah

  • 1Department of Pharmaceutical Sciences, The University of Tennessee College of Pharmacy, Memphis, TN 38163, USA.

AAPS Pharmscitech
|January 20, 2004
PubMed
Summary

Extending emulsification time for poly(lactide-co-glycolide) microspheres manufacturing significantly reduces droplet size and increases surface area. This process control is key for tailoring microsphere characteristics.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Pharmaceutical Technology

Background:

  • Microsphere production relies on controlled emulsification for desired particle size.
  • Poly(lactide-co-glycolide) (PLGA) microspheres are widely used in drug delivery.
  • Emulsification time is a critical parameter influencing droplet and subsequent microsphere characteristics.

Purpose of the Study:

  • To investigate the dynamic effect of emulsification time on emulsion droplet size.
  • To quantify the relationship between emulsification duration and microsphere size distribution.
  • To understand the impact of emulsification kinetics on PLGA microsphere formation.

Main Methods:

  • Emulsification of a poly(lactide-co-glycolide) and ethyl acetate solution in poly(vinyl alcohol).

Related Experiment Videos

  • Varied emulsification times from 2 to 60 minutes.
  • Ethyl acetate extraction followed by microsphere size distribution analysis.

    • Main Results:

    • Emulsification time extended from 2 to 60 minutes reduced droplet size from 98.1 to 50.3 microm.
    • Droplet surface area increased from 0.07 to 0.29 m²/g with prolonged emulsification.
    • Smaller droplets (1-60 microm) increased, while larger ones (>81 microm) disappeared, indicating fragmentation.

    Conclusions:

    • Prolonging emulsification time leads to smaller emulsion droplets and increased microsphere surface area.
    • Droplet fragmentation during emulsification is the primary driver for smaller microsphere populations.
    • The timing of solvent extraction influences droplet dynamics and final microsphere size distribution.