Capillary Free-Solution Electrophoresis for High-Resolution DNA Separation
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Solution Overview
Problem
Conventional methods for separating biomolecules by size, such as electrophoresis, require large quantities, are time-consuming, and have limited resolution, especially for large molecules, and often necessitate the use of separating matrices which are difficult to implement in capillary tubes.
Innovation Solution
A method involving the use of a channel with a minimum dimension of less than or equal to 25 μm, where molecules or deformable objects are separated by a combination of hydrodynamic flow and electric field, allowing for rapid and flexible separation without a matrix, utilizing a non-Newtonian liquid medium with uncharged polymers like polyvinylpyrrolidone or poly(ethylene glycol) to enhance separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gel electrophoresis is used for separating biomolecules by size, then separation can be achieved, but the method requires large quantities of material, is time-consuming, and has limited resolution for large molecules
Solution Approach 1:
The patent changes the physical parameters of the separation system by using free solution electrophoresis instead of gel matrix, operating in a capillary format with controlled temperature and electric field parameters. This enables high-resolution separation of large DNA molecules (greater than 40 or 50 kb) while reducing separation time compared to conventional gel electrophoresis
Solution Approach 2:
The patent extracts the separating function from the gel matrix environment and performs electrophoresis in free solution within a capillary tube. This removes the limitations of gel-based methods while maintaining separation capability, allowing rapid analysis with improved resolution for large molecules
2Measurement precision
If pulsed field electrophoresis is used to improve resolution for large molecules, then resolution power is improved, but the separation duration becomes even longer (greater than 10 hours)
Solution Approach 1:
The patent employs continuous electric field electrophoresis in a capillary format rather than pulsed field conditions, optimizing field strength and capillary dimensions to achieve both high resolution for large molecules and reduced separation duration, avoiding the >10 hour timescales of pulsed field methods
3Measurement precision
If matrices are introduced into capillary tubes for electrophoresis, then separation can be performed, but the cross-linking of gels in situ is difficult to reproduce and high viscosity polymer solutions require very high pressure for filling and emptying
Solution Approach 1:
The patent removes the matrix component entirely from the capillary electrophoresis system, performing separation in free solution. This eliminates the difficulties of gel cross-linking reproducibility and high-pressure filling/emptying operations while maintaining effective separation capability through capillary-based free solution electrophoresis
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 enables efficient separation of molecules and deformable objects across various size ranges with improved resolution and reduced separation time, facilitating the use of smaller channels and simpler setups compared to traditional methods.
Implementation Method 1
displacement of the molecules under the effect of an electric field
Implementation Method 2
applying a hydrodynamic flow in the channel together with the application of an electric field in the channel
Data Source
AI summary
A method for separating a plurality of deformable objects, such as biological cells or biological supramolecules such as DNA, in a liquid medium by use of an electrophoretic technique combined with hydrodynamic forces. The deformable objects are introduced into a channel, having a flow axis and a cross section at right angles to the flow axis, with the minimum size of the cross section being less than or equal to 50 pm; A hydrodynamic flow is defined a in the channel together with the application of an electric field in the channel, making it possible to move the deformable objects in the channel according to the flow axis and to separate them along the flow axis. A device suitable for implementing this method. The electrolyte used for the electrophoretic separation may be a non-Newtonian fluid with viscoelastic properties.