Stable Electrophoresis Separation Medium for Room-Temperature DNA Analysis
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Solution Overview
Problem
Conventional capillary electrophoresis (CE) separation media containing urea as a denaturant suffer from chemical instability, leading to degradation at room temperature, which shortens their shelf life and affects the resolution and conductivity of DNA separations, especially for long DNA molecules.
Innovation Solution
A non-crosslinked or sparsely cross-linked polymer composition with hydrolytically stable denaturants, such as proline, histidine, and organic solvents like DMSO, is used to maintain the stability of DNA separation media at room temperature, preventing degradation and maintaining resolution for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urea is used as a denaturant in electrophoresis medium, then DNA denaturation and separation are achieved, but chemical instability and degradation occur at room temperature
Solution Approach 1:
The patent changes the chemical composition parameters by replacing urea with alternative denaturants such as formamide, guanidinium thiocyanate, or SDS, and adjusts polymer concentrations to achieve both DNA denaturation capability and enhanced chemical stability at room temperature, extending shelf life without refrigeration
Solution Approach 2:
The patent creates composite electrophoresis media by combining stable denaturants with specifically selected polymer networks (such as polyacrylamide or polyethylene glycol) that are resistant to hydrolysis and degradation, forming a chemically stable composite system that maintains both denaturation function and long-term stability
2Measurement precision
If conventional sieving media are used, then DNA separation is achieved, but resolution degrades over time due to degradation
Solution Approach 1:
The patent optimizes polymer concentration ranges and molecular weight distributions to create sieving networks that maintain consistent pore structures over time, preventing resolution degradation while extending functional stability period through careful parameter selection of polymer composition and cross-linking density
3Ease of operation
If urea-containing media are stored at room temperature, then ease of operation is improved, but conductivity increases and function degrades
Solution Approach 1:
The patent selects denaturants and buffer systems with stable ionic compositions that do not degrade or decompose at room temperature, maintaining consistent electrical conductivity and preventing function degradation while allowing convenient room temperature storage and operation
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
The new composition ensures functional stability for at least seven days at 23°C, allowing for effective DNA separation and resolution without the need for refrigeration, suitable for applications like DNA sequencing and forensic analysis.
Implementation Method 1
dissolved, water-soluble polymers, for instance, linear polyacrylamides, poly-N-substituted acrylamides, or poly-N,N-disubstituted acrylamides, which, at appropriate concentrations, are designed to form entangled polymer networks that physically 'sieve' DNA molecules according to their size and shape during electrophoresis
Implementation Method 2
one or more denaturant compounds, in an amount sufficient to inhibit re-naturation of single stranded polynucleotides
Implementation Method 3
Capillary electrophoresis (CE) instruments are useful for analysis of DNA samples
Data Source
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Figure 3(1)~3(7)
AI summary
Provided herein is an electrophoresis separation medium comprising: (a) a non-crosslinked or sparsely cross-linked polymer or copolymer; (b) one or more denaturant compounds, in an amount sufficient to inhibit re-naturation of single stranded polynucleotides; (c) an aqueous solvent; (d) optionally, a wall-coating material suited to inhibition of electroosmotic flow; and (e) optionally, an organic water miscible solvent such as DMSO or acetonitrile, wherein the electrophoresis separation medium exhibits functional stability for at least seven days at 23° C. Also provided herein are sieving compositions, including polymer-based sieving compositions, for molecular sieving as well as related kits, devices and methods of use. Such compositions can be useful for separation of biomolecules such as nucleic acids, proteins, glycoproteins and glycans.