Fabry-Perot Etalon Monitoring for In Situ Cell Viability
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Solution Overview
Problem
Current methods for measuring cell densities and protein aggregates are often destructive, time-consuming, and require expensive equipment, limiting real-time monitoring and feedback in bioprocessing, especially in cell therapy and monoclonal antibody production.
Innovation Solution
The use of a Fabry Perot etalon system that allows for non-destructive, real-time monitoring of cell viability and protein aggregation by analyzing changes in refractive index and absorption measurements in the near-infrared region, enabling in situ measurements during bioprocessing without the need for sample withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive sampling methods are used to measure cell density and protein aggregates, then measurement accuracy can be achieved, but real-time monitoring capability is lost and sample exposure time increases
Solution Approach 1:
The patent replaces mechanical sampling and offline analysis with optical measurement systems that perform non-destructive real-time monitoring. Optical sensors measure cell density and protein aggregates through light interaction with the culture medium, eliminating the need to withdraw and physically analyze samples while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces optical intermediaries (light sources and detectors) that indirectly measure biological parameters without direct contact with cells. By measuring optical properties of the culture medium rather than analyzing cells directly, the system achieves real-time monitoring without destroying samples or exposing them to harmful conditions.
2Reliability
If expensive equipment and consumables are used for cell analysis, then measurement reliability improves, but operational cost and complexity increase
Solution Approach 1:
The patent employs inexpensive optical components and disposable flow cells that can be easily replaced rather than expensive, complex analytical instruments. The system uses standard optical sensors and affordable consumable flow cells, eliminating the need for costly equipment while maintaining reliable measurements through proper optical design and calibration.
Solution Approach 2:
The patent creates a universal optical measurement platform that can monitor multiple parameters (cell density, protein aggregates, concentration) using the same basic optical system. This multi-functional approach replaces multiple specialized expensive instruments with a single versatile optical measurement system.
3Device complexity
If batch analysis is performed after process completion, then equipment requirements are reduced, but real-time feedback capability is lost and process optimization is limited
Solution Approach 1:
The patent enables continuous real-time monitoring throughout the entire bioprocess rather than performing discrete batch analyses at the end. Optical sensors continuously measure cell density and protein aggregates, providing ongoing feedback that allows real-time process adjustments and optimization, eliminating the wait time associated with batch processing.
Solution Approach 2:
The patent implements real-time feedback mechanisms where optical measurements are continuously monitored and can trigger process adjustments. This feedback loop allows operators to optimize process parameters dynamically based on actual measurements, significantly accelerating the optimization process compared to post-batch analysis.
4Measurement precision
If offline sampling is used to monitor cell viability, then measurement accuracy can be maintained, but hands-free operation and in situ monitoring are lost
Solution Approach 1:
The patent replaces manual sampling operations with automated optical measurement systems. Optical sensors mounted in the bioreactor perform non-contact measurements of cell viability through light interaction with the culture medium, eliminating the need for manual sample withdrawal and analysis while maintaining measurement accuracy.
Solution Approach 2:
The patent enables the system to monitor itself without external intervention. Optical sensors continuously measure cell viability parameters in situ, and the system can automatically process and interpret these measurements, eliminating the need for operator involvement in sample collection and analysis.
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
This approach provides rapid, accurate, and continuous data on cell viability and protein aggregation, enhancing process control and product quality in bioprocessing by reducing exposure to external conditions and minimizing equipment costs.
Implementation Method 1
A non-destructive, real-time monitoring system using a Fabry Perot etalon with a photodetector window that captures changes in refractive index
Implementation Method 2
Fabry Perot interferometry for measuring cell viability
Implementation Method 3
absorption measurements in the near-infrared region
Data Source
AI summary
A method for studying cell viability and protein aggregation involves establishing a Fabry Perot etalon signal within an optical spectroscopic feature, e.g., in the near infrared region. Protein aggregation and cell viability can be reflected by changes observed in the magnitude of the Fourier Transform peaks observed in the frequency or space domain associated with the contrast of the etalon. In short, the presence of viable cells and protein aggregates can degrade the etalon contrast of an etalon window. In some cases, the concentration of cells and monomeric protein can be measured as well.