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

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The identification of critical process parameters in biologics and small molecule process development is a key element of quality by design. The objectivity and consistency of procedures to identify critical… Click to show full abstract

The identification of critical process parameters in biologics and small molecule process development is a key element of quality by design. The objectivity and consistency of procedures to identify critical process parameters can be improved with the use of impact ratios. Impact ratios quantify a process parameter’s practical effect on a critical quality attribute relative to the critical quality attribute’s acceptance limits. If the impact ratio is large, i.e., exceeds a predefined impact ratio threshold, the recommendation is to classify the process parameter as a critical process parameter. This article introduces an improved and mathematically well-defined impact ratio. Benefits of this impact ratio are a consistent interpretation for many scenarios commonly encountered in practice, high suitability to automation, and the possibility of standardizing on a single impact ratio definition for pharmaceutical manufacturing.

Keywords: process parameters; process; impact ratio; critical process

Journal Title: PDA Journal of Pharmaceutical Science and Technology
Year Published: 2022

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