Pulsed Electric Field Microfluidic Mobility Shift Assay
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Solution Overview
Problem
Current mobility shift assays in microfluidic devices face challenges with low throughput and resolution due to long transit times, leading to increased thermal and hydrodynamic dispersion, which affects the accuracy and efficiency of molecular interaction detection.
Innovation Solution
The application of a pulsed electric field in microfluidic devices to separate molecules based on their electrophoretic mobility, optimizing the flow and detection of labeled molecules to enhance throughput and resolution by minimizing transit times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional continuous electric field is used for electrophoretic separation, then separation resolution is achieved, but transit time is long leading to thermal and hydrodynamic dispersion
Solution Approach 1:
The patent applies periodic pulsed electric fields instead of continuous fields. The pulsed field alternates between on and off states, creating periodic electrophoretic motion that reduces thermal dispersion while maintaining separation resolution. The pulse timing and duration are optimized to achieve both fast transit and adequate separation.
Solution Approach 2:
The patent dynamically adjusts the electric field parameters including pulse frequency, duty cycle, and amplitude during the separation process. This dynamic control allows optimization of both transit time and resolution by adapting field conditions to the specific separation requirements and molecular properties.
2Measurement precision
If longer transit time is used for separation, then resolution improves, but thermal dispersion and hydrodynamic dispersion increase
Solution Approach 1:
The periodic pulsed electric field creates intermittent electrophoretic driving force that reduces continuous thermal heating and hydrodynamic disturbances. The off-periods allow thermal relaxation and reduced flow disturbances, minimizing dispersion while maintaining separation capability during on-periods.
Solution Approach 2:
The patent changes the electric field parameters from continuous to pulsed, adjusting pulse width, frequency, and amplitude to optimize the balance between separation resolution and minimization of thermal and hydrodynamic dispersion effects.
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 significantly increases the throughput and resolution of mobility shift assays by reducing transit times, allowing for more efficient detection and characterization of molecular interactions, particularly in reactions where fluorogenic measurements are not feasible.
Implementation Method 1
Molecules to be assayed are flowed through one or more microchannels and subjected to a pulsed electric field. The molecules are then detected and their interactions are characterized based upon the molecules' differing electrophoretic mobility.
Data Source
AI summary
The present invention provides novel microfluidic devices and methods for performing pulsed field mobility shift assays in microfluidic devices. In particular the devices and methods of the invention utilize differences between electrophoretic mobilities (e.g., as between reactants and products, especially in non-fluorogenic reactions) in order to separate the species and thus analyze the reaction.