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Related Experiment Videos

Freeze-drying using vacuum-induced surface freezing.

Martin Kramer1, Bernd Sennhenn, Geoffrey Lee

  • 1Lehrstuhl für Pharmazeutische Technologie, University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany.

Journal of Pharmaceutical Sciences
|February 9, 2002
PubMed
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This study introduces a novel vacuum-induced surface freezing method for freeze-drying, promoting large ice crystal formation. This technique significantly shortens primary drying times and, with annealing, achieves low residual moisture content in pharmaceutical formulations.

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Chemical Engineering

Background:

  • Freeze-drying (lyophilization) is a critical process for stabilizing pharmaceuticals.
  • Controlling ice crystal formation during freezing impacts drying efficiency and product quality.
  • Undercooling and slow cooling rates can lead to suboptimal ice structures.

Purpose of the Study:

  • To investigate a novel freezing method for freeze-drying that avoids undercooling.
  • To promote the growth of large, dendritic ice crystals for improved drying kinetics.
  • To evaluate the impact of this method on primary drying duration and residual moisture content.

Main Methods:

  • Aqueous solutions (mannitol, sucrose, glycine) were subjected to vacuum-induced surface freezing at +10°C.

Related Experiment Videos

  • Crystal growth was induced by releasing vacuum and lowering shelf temperature.
  • Primary drying time was measured using inverse comparative pressure measurement.
  • Cake structure was analyzed using light microscopy and wide-angle X-ray diffraction.
  • An annealing step was incorporated to assess its effect on residual moisture.

    • Main Results:

    • Vacuum-induced surface freezing yielded large, chimney-like ice crystals.
    • Primary drying duration was reduced by up to 20% compared to moderate freezing.
    • Mannitol solutions showed higher residual moisture, while sucrose and glycine showed no difference initially.
    • Incorporating an annealing step with this method achieved 0.2% residual moisture for mannitol.

    Conclusions:

    • Vacuum-induced surface freezing is an effective method to control ice nucleation and growth.
    • This technique can significantly accelerate the primary drying phase of freeze-drying.
    • Combining vacuum-induced surface freezing with annealing optimizes the process for low residual moisture, particularly for mannitol formulations.