Column-Based Viral Inactivation Control via pH and Residence Time Feedback
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Solution Overview
Problem
Continuous flow reactors fail to effectively control operating pH and residence time distribution, leading to challenges in viral clearance and product quality in biologic manufacturing processes.
Innovation Solution
A low-cost, column-based continuous viral inactivation system using off-the-shelf components with a model-based pH feedback control scheme and periodic estimation of residence time distribution to adjust feed flow rates, ensuring accurate minimum residence time and pH setpoint tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous flow reactors are used for viral inactivation, then productivity is improved, but control of operating pH and residence time distribution deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors pH and residence time distribution in the continuous flow reactor and adjusts operating parameters to maintain optimal conditions for viral inactivation. This feedback mechanism resolves the contradiction by enabling precise control despite the continuous flow mode, ensuring that productivity gains do not compromise manufacturing precision.
2Reliability
If residence time is increased to improve viral clearance, then viral clearance is improved, but product quality deteriorates due to over-incubation
Solution Approach 1:
The patent employs dynamic control of residence time through continuous monitoring and adjustment of flow rates. The system maintains residence time within an optimal window that achieves sufficient viral clearance while preventing over-incubation damage to the biopharmaceutical product. This dynamic adjustment resolves the contradiction by adapting residence time in real-time rather than using fixed values.
Solution Approach 2:
The system changes operating parameters (flow rate, pH, temperature) dynamically during the process to optimize both viral clearance and product quality. By adjusting these parameters in response to real-time measurements, the system achieves the desired viral reduction without excessive residence time that would harm the product.
3Reliability
If pH adjustment is aggressive to improve viral inactivation, then viral inactivation is improved, but product quality deteriorates due to excessive pH adjustment
Solution Approach 1:
The patent uses feedback control to monitor pH continuously and make incremental adjustments to achieve viral inactivation without excessive pH changes. The system responds to real-time pH measurements with controlled adjustments, preventing the quality degradation that would result from aggressive pH manipulation while still achieving effective viral inactivation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves tight control of viral clearance with logarithmic reduction values over extended operation, preventing over-incubation and excessive pH adjustments, thereby enhancing product quality and productivity.
Implementation Method 1
pH feedback controller to adjust feed flow rates
Implementation Method 2
The residence time distribution (RTD) is estimated periodically during operation through inverse tracer experiments and used to estimate minimum residence time (MRT)
Implementation Method 3
column-based continuous viral inactivation system
Data Source
AI summary
Provided herein is a column-based continuous viral inactivation system, comprising one or both of a pH feedback controller to adjust feed flow rates and a minimum residence time (MRT) feedback controller to adjust feed flow rates. Methods of viral inactivation with the system are also provided.