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Basic Cycle Development Techniques For Lyophilized Products
ABSTRACT:
For drug products that are produced on a large scale, cycle optimization is important for two reasons: manufacturing cost and manufacturing throughput.
Just like building a house, building a quality lyophilization cycle must begin with a strong, well built foundation. In the case of a freeze-dried product, the formulation is the foundation. The freeze-drying process is going to be compromised unless a strong formulation is developed prior to starting cycle design.
The development scientist must do a thorough review of the drug's pertinent properties, most critically those affecting degradation and stability. Factors such as allowable temperature extremes, crystalline behavior, and light sensitivity will all factor into the optimized cycle's constraints. In addition the cycle development requires a good understanding of the thermal behavior of the product during drying.
Additionally, the scientist must talk with the engineers and equipment operators to gain an understanding of the commercial freeze-dryer where the cycle will be used. This should be done to insure the cycle design will transfer successfully on scale-up from the pilot lyophilizer studies to the commercial lyophilizer.
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