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Single droplet drying step characterization in microsphere preparation.

Belal Al Zaitone1, Alf Lamprecht

  • 1Laboratory of Pharmaceutical Technology and Biopharmaceutics, University of Bonn, Bonn, Germany. b.zaitone@gmail.com

Colloids and Surfaces. B, Biointerfaces
|February 12, 2013
PubMed
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Acoustic levitation enables single-droplet analysis of spray drying microencapsulation. This method quantifies how temperature, polymer concentration, and droplet size affect drying time and particle morphology, aiding process optimization.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Pharmaceutical Sciences

Background:

  • Spray drying is a widely used microencapsulation technique.
  • Characterizing spray drying processes is challenging due to inaccessible process parameters.
  • Understanding droplet behavior during drying is crucial for controlling particle formation.

Purpose of the Study:

  • To investigate microencapsulation by spray drying using acoustic levitation.
  • To characterize the influence of key process parameters on droplet drying behavior.
  • To establish acoustic levitation as a viable lab-scale method for spray drying process analysis.

Main Methods:

  • Utilized acoustic levitation to isolate and analyze single droplets during the spray drying process.
  • Simulated spray drying conditions using poly(lactide-co-glycolide)/ethyl acetate for microencapsulation.

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  • Varied process parameters including temperature (0-40°C), polymer concentration (5-400 mg/ml), and droplet size (0.5-1.37 μl).

    • Main Results:

    • Quantified the impact of temperature, polymer concentration, and droplet size on drying time and kinetics.
    • Observed significant changes in particle morphology, including hollow particle formation at high polymer concentrations.
    • Demonstrated that at 21°C and 5 mg/ml, particle diameter (Dp/D0) reached 0.25 in 350s.
    • At 400 mg/ml, particle diameter (Dp/D0) reached 0.8 with a tenfold increase in drying time.

    Conclusions:

    • Acoustic levitation provides a powerful lab-scale tool for characterizing spray drying microencapsulation.
    • This method allows for precise control and analysis of parameters mimicking full-scale spray drying.
    • Findings offer insights into optimizing spray drying parameters for desired particle characteristics.