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A Dehydration-Diffusion Competition Framework Predicts Interfacial Film Risk in High-Concentration Biologics

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Transient dehydration during fill-finish operations can cause high-concentration protein formulations to form irreversible films. This study defines key metrics to predict and prevent these issues, ensuring manufacturing success.

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Area of Science:

  • Biopharmaceutical Manufacturing
  • Protein Formulation Science
  • Rheology

Background:

  • High-concentration protein formulations are crucial for subcutaneous injections, offering clinical and commercial benefits.
  • However, these formulations are prone to dehydration during manufacturing, leading to residue formation and operational failures like clogged needles.
  • Transient dehydration can create interfacial viscoelastic films that resist redissolution and hinder drug delivery performance.

Purpose of the Study:

  • To establish an operational framework linking dehydration exposure to film mechanics and reversibility in high-concentration biologics.
  • To identify critical parameters and thresholds for preventing irreversible film formation during fill-finish processes.
  • To develop quantitative limits for downtime and rewet strategies based on formulation properties and dehydration conditions.

Main Methods:

  • Utilized a bench-scale apparatus with controlled airflow to study dehydration effects on protein formulations.
  • Measured interfacial viscoelastic properties, including storage modulus (G"), as a function of accumulated mass loss.
  • Defined and employed four portable readouts: maximum film strength (GM"), final film strength (GF"), imbibition time (tImb), and dissolving time (tDis).

Main Results:

  • Observed orders-of-magnitude increases in interfacial storage modulus (G") with increasing mass loss.
  • Identified two critical packing thresholds: random loose packing (RLP, ~0.56) and random close packing (RCP, ~0.64), which influence film mechanics and kinetics.
  • Determined a critical mass loss window (~52-55%) associated with a sharp rise in final film strength and conditional irreversibility on process time scales.

Conclusions:

  • Developed a quantitative framework and an actionable "no-film/at-risk" map for high-concentration protein formulations.
  • The map is indexed to dehydration flux, time, and formulation properties, providing critical insights for process optimization.
  • The findings offer quantitative limits for manufacturing downtime and rewet strategies to mitigate irreversible film formation in fill-finish operations.