Interpenetrating Polymer Network for Capillary Electrophoresis EOF Control
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Solution Overview
Problem
Capillary electrophoresis in DNA sequencing is hindered by variable electro-osmotic flow (EOF), which reduces resolution and is challenging to control, especially in precoated capillaries that are expensive and have limited lifetime and reproducibility issues.
Innovation Solution
Compositions comprising a sieving component of non-crosslinked hydrophilic acrylamide polymer and a surface interactive component of interpenetrating polymer network (IPN) made from non-crosslinked hydrophilic N-vinyl amide and acrylamide polymers, which suppress EOF and provide high resolution and stability for DNA sequencing without the need for crosslinked polymers or precoating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precoated capillaries are used to control EOF, then EOF control is improved, but cost increases and lifetime is limited
Solution Approach 1:
The patent replaces expensive precoated capillaries with a reusable uncoated capillary system that uses inexpensive polymer composition solutions. The polymer composition is simply introduced into the uncoated capillary, eliminating the need for costly pre-coating processes while maintaining EOF control through the polymer's interaction with the capillary surface.
Solution Approach 2:
The patent controls EOF by adjusting parameters of the polymer composition including polymer type, concentration, molecular weight, and crosslinking degree. By optimizing these parameters, the composition achieves effective EOF control without requiring expensive precoated capillaries, thus resolving the contradiction between reliability and manufacturing cost.
2Reliability
If precoated capillaries are used to control EOF, then EOF control is improved, but reproducibility deteriorates
Solution Approach 1:
The patent eliminates reproducibility issues associated with precoated capillaries by using a standardized uncoated capillary system with a well-defined polymer composition. The polymer composition can be precisely controlled and reproduced batch-to-batch, ensuring consistent EOF control across multiple experiments and capillaries.
Solution Approach 2:
The patent achieves reproducible EOF control by precisely controlling polymer composition parameters such as concentration, molecular weight distribution, and crosslinking density. These parameters can be accurately specified and reproduced, eliminating the variability inherent in precoating processes.
3Reliability
If crosslinked polymers are used to suppress EOF, then EOF suppression is improved, but resolution deteriorates due to reduced flexibility
Solution Approach 1:
The patent optimizes the crosslinking degree to a specific range (0.1-10 mol%) that balances EOF suppression with maintenance of polymer chain flexibility. This controlled crosslinking provides sufficient structural stability for EOF control while preserving the flexibility needed for high-resolution separation of DNA fragments.
Solution Approach 2:
The patent uses composite polymer systems combining different polymer components with complementary properties. The combination achieves effective EOF suppression through the interactive component while the sieving component maintains flexibility and resolution, resolving the contradiction between EOF control and separation quality.
4Reliability
If high viscosity polymers are used to control EOF, then EOF control is improved, but separation efficiency deteriorates due to increased resistance
Solution Approach 1:
The patent optimizes polymer concentration and molecular weight to achieve effective EOF control without excessive viscosity. By carefully selecting these parameters, the composition provides sufficient polymer-polymer and polymer-surface interactions for EOF suppression while maintaining low enough viscosity to allow efficient analyte migration and separation.
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 compositions achieve improved single-base resolution and reduced run time in capillary electrophoresis, maintaining stability at ambient temperatures and providing superior separation of DNA fragments compared to commercial reference compositions.
Implementation Method 1
One factor that may complicate separations by capillary electrophoresis is the phenomena of electro-osmosis, which is fluid flow in a capillary induced by an electrical field.
Implementation Method 2
Capillary electrophoresis has been applied widely as an analytical technique because of several technical advantages
Implementation Method 3
capillaries have high surface-to-volume ratios which permit more efficient heat dissipation which, in turn, permit high electric fields to be used for more rapid separations
Data Source
AI summary
Embodiments of the present application relate to compositions comprising a sieving component, and a surface interactive component comprising an interpenetrating polymer network that includes comprising a hydrophilic N-vinyl amide polymer and a hydrophilic acrylamide polymer. The compositions are used for separating analytes by capillary electrophoresis. Kits and methods including the compositions for separating analytes by capillary electrophoresis are also provided.