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Process optimization and transfer of freeze-drying in nested vial systems.

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Summary

Freeze-drying vials in a Polyetheretherketon (PEEK) rack offers faster, more homogeneous drying than traditional trays. This enhances process flexibility and enables successful scale-up for biopharmaceutical manufacturing.

Keywords:
Direct contactEdge-vial-effectFreeze dryingHeat transferLyophilizationNested vialProduct temperatureRack systemRadiationSublimation rates

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Area of Science:

  • Pharmaceutical Technology
  • Chemical Engineering
  • Bioprocessing

Background:

  • Scale-up and transfer of freeze-drying processes present significant challenges in the biopharmaceutical industry.
  • Vial holding systems, particularly those using racks, are increasingly used in small batch processing, necessitating a deeper understanding of their performance.

Purpose of the Study:

  • To compare freeze-drying cycles and scale-up parameters for vials in a Polyetheretherketon (PEEK) rack versus a conventional stainless steel tray.
  • To investigate the impact of fill volume and rack loading on freeze-drying homogeneity and efficiency.

Main Methods:

  • Product temperature (Tp) profiles and Kv values were measured for vials in PEEK racks and stainless steel trays under various conditions.
  • Freeze-drying cycles were compared between rack and tray setups, including evaluations of partially versus fully loaded racks.
  • Scale-up from laboratory to pilot scale was assessed for rack-based freeze-drying.

Main Results:

  • Vials in PEEK racks exhibited faster and more homogeneous drying, particularly for center vials, compared to those in bulk tray settings.
  • The rack setup demonstrated greater flexibility in accommodating variations in fill volume due to its homogeneous drying characteristics.
  • Successful transfer and scale-up from a single rack in a lab-scale freeze-dryer to multiple racks in a pilot-scale unit were achieved.

Conclusions:

  • Freeze-drying in vials within a PEEK rack offers advantages in speed and homogeneity over tray-based systems.
  • Understanding sublimation rates is critical for successful cycle transfer between rack and tray configurations.
  • The study enhances knowledge for efficient scale-up and transfer of freeze-drying processes using rack systems.