Microfluidic Impedance Detection of Cell Transfection Status
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Solution Overview
Problem
Existing methods for determining the transfection status and recovery time of electroporated cells are inefficient and often require additional staining steps, which can be undesirable.
Innovation Solution
A microfluidic-based method and device for verifying cell membrane disruption and transfection status, allowing for real-time monitoring and separation of viable and transfection-competent cells using hydrodynamic focusing and electrical impedance measurements, followed by cell separation based on transfection status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If staining steps are used to determine transfection status, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent replaces complex staining procedures with electrical impedance measurement. Instead of using chemical stains and manual microscopy, the system uses electrodes to measure electrical properties of cells, automatically determining transfection status through electronic detection and analysis.
Solution Approach 2:
The system enables automatic detection and classification of transfected cells without requiring manual staining or interpretation. The electrical impedance measurement system self-automates the entire detection process, from measurement to classification, eliminating the need for operator-performed staining steps.
2Ease of operation
If electrical impedance measurement is used, then ease of operation is improved, but measurement precision may deteriorate
Solution Approach 1:
The system uses dynamic multi-frequency electrical impedance measurements to capture changing cell properties. By measuring at multiple frequencies and analyzing the dynamic response, the system achieves precise detection of transfection status while maintaining non-destructive, easy operation.
Solution Approach 2:
The system incorporates feedback through automated analysis of impedance measurement data. The measurement results are automatically processed and used to classify cells, providing precise detection without requiring manual intervention while maintaining ease of operation.
3Device complexity
If batch mode processing is used, then device complexity is reduced, but productivity deteriorates
Solution Approach 1:
The system performs preliminary actions by preparing the cell suspension and loading it into the device before processing begins. This allows continuous automated processing to follow, increasing productivity while maintaining manageable device complexity through standardized preparation protocols.
Solution Approach 2:
The system enables continuous processing of cell samples through automated measurement and classification sequences. Multiple cells are measured in succession without manual intervention between samples, maintaining continuous useful action and significantly increasing productivity compared to traditional batch methods.
Data Source
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AI summary
A method of determining the transfection status of a plurality of cells comprising the steps of providing a population of cells that have been subjected to a cell membrane disruption treatment, passing a focussed stream of the population of cells in a carrier liquid along a microfluidic channel having a detection zone comprising a pair of detection electrodes configured to detect electrical impedance across the channel in the detection zone, detecting a change in the electrical impedance across the channel in the detection zone corresponding to each of the plurality of cells passing the detection zone, comparing the change in electrical impedance for each cell with a reference change in electrical impedance, and calculating the transfection status of the plurality of cells based on the comparison.