Microcapillary Electrophoretic Trap for Nucleic Acid Concentration
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Solution Overview
Problem
Current microfluidic devices suffer from inefficient concentration and separation of nucleic acids and polynucleotides due to uniform concentration across the capillary cross-section and poor performance in detecting biomarkers at the capillary walls.
Innovation Solution
Microfluidic devices with a microcapillary structure that generates an electrophoretic flow opposing the fluid flow, utilizing a neutral polymer coating to suppress electroosmosis, and recirculation mechanism to concentrate particles at a specific region, allowing for controlled particle migration and separation based on size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional microfluidic device is used for nucleic acid separation, then the device structure is simple, but the concentration and separation efficiency is poor due to uniform concentration across the capillary cross-section
Solution Approach 1:
The device segments the capillary into distinct functional zones: an inlet area with larger cross-sectional dimensions and a microcapillary section with smaller dimensions. This segmentation creates non-uniform concentration distribution and enables efficient particle concentration at the interface between these segments, directly addressing the poor separation efficiency of conventional uniform capillaries.
Solution Approach 2:
The invention transitions from a simple linear capillary to a multi-dimensional structure by creating an inlet area that extends in multiple spatial dimensions relative to the microcapillary. This dimensional expansion allows for complex flow patterns and concentration mechanisms that cannot be achieved in a simple one-dimensional capillary, thereby improving separation efficiency.
2Measurement precision
If electroosmosis is not suppressed, then the device operation is simple, but detection of biomarkers at capillary walls is poor
Solution Approach 1:
A neutral polymer coating is introduced as an intermediary substance between the capillary wall and the fluid. This coating layer suppresses electroosmosis by providing a neutral interface that prevents charge-induced flow, thereby enabling accurate biomarker detection at the capillary walls without the interference of electroosmotic effects.
3Quantity of substance
If electrophoretic flow is applied opposing fluid flow, then particle concentration at stagnation point is achieved, but energy consumption increases
Solution Approach 1:
The electrophoretic flow is applied locally at the inlet area where particles need to be concentrated, rather than throughout the entire capillary length. This localized application of electric field creates the necessary stagnation point for particle concentration while minimizing overall energy consumption by limiting the electrophoretic action to only the region where concentration is needed.
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
Achieves rapid and efficient concentration of particles, particularly nucleic acids, at a stagnation point within the microfluidic device, enabling effective detection and separation by enhancing local concentration and reducing axial dispersion.
Implementation Method 1
The microfluidic device can be configured to generate an electrophoretic flow that can be in opposition to a fluid flow through the microcapillary
Implementation Method 2
The microcapillary can be coated with a neutral compound or neutral polymer
Data Source
AI summary
Provided herein are microfluidic devices that can be configured to generate an electrophoretic flow that is in opposition to a fluid flow through a microcapillary of a microfluidic device provided herein. Also provided herein are methods that include adding an amount of particle to the inlet area of the microfluidic device as provided herein, generating a first fluid flow through the microcapillary of the microfluidic device provided herein; and applying a uniform electric field to the microfluidic device, where the uniform electric field generates an electrophoretic flow that is in opposition to the fluid flow.