An Improved Impact Ratio for Identifying Critical Process Parameters in Pharmaceutical Manufacturing Processes

Area of Science:

• Pharmaceutical Science
• Process Development
• Quality by Design

Background:

• Critical process parameters (CPPs) are vital for ensuring product quality in biologics and small molecule manufacturing.
• Current methods for identifying CPPs can lack objectivity and consistency.
• Impact ratios offer a quantitative approach to assess parameter influence on critical quality attributes (CQAs).

Purpose of the Study:

• To introduce an improved, mathematically defined impact ratio for CPP identification.
• To enhance the objectivity and consistency of CPP identification procedures.
• To facilitate the standardization of CPP assessment in pharmaceutical manufacturing.

Main Methods:

• Quantifying the practical effect of a process parameter on a CQA relative to its acceptance limits.
• Utilizing a predefined impact ratio threshold to classify parameters as critical.
• Developing a mathematically robust impact ratio for consistent interpretation.

Main Results:

• The proposed impact ratio provides a consistent interpretation across various practical scenarios.
• The method demonstrates high suitability for automation in process development.
• A single, standardized impact ratio definition is achievable for pharmaceutical manufacturing.

Conclusions:

• The improved impact ratio offers a more objective and consistent method for identifying CPPs.
• This approach supports the principles of Quality by Design in pharmaceutical development.
• Standardization of impact ratio calculations can streamline regulatory processes and improve manufacturing efficiency.