Electrolytic pH Gradient Generation for Isoelectric Focusing
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Solution Overview
Problem
Isoelectric focusing methods face challenges such as the need for multiple gels with different proton concentration gradients, high costs, logistical difficulties in handling fragile gels, batch-to-batch reproducibility issues, and slow analysis due to large protein molecules' difficulty in migrating through gel pores.
Innovation Solution
A device comprising independently controllable cells that produce specified proton concentrations in a fluid environment, allowing for mutable and temporally variable proton concentration topographies, enabling isoelectric focusing without immobilized gradients and facilitating easier analyte separation and data display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel-based isoelectric focusing is used, then molecular separation by charge is achieved, but the gels are expensive, fragile, and difficult to manipulate automatically
Solution Approach 1:
The patent replaces the mechanical gel matrix with a field-based system using charged beads in a fluid medium. Instead of relying on physical gel structures that are fragile and difficult to handle, the invention uses electrostatic fields and fluid dynamics to achieve separation, eliminating the need for fragile gel manipulation and enabling automated handling.
Solution Approach 2:
The patent employs fluid dynamics and hydraulic principles to transport and separate molecules. By using a fluid medium containing charged beads rather than a solid gel matrix, the system leverages fluid flow and buoyancy forces to achieve separation, making the system more adaptable to automated manipulation and reducing fragility issues.
2Measurement precision
If multiple gels with different proton concentration gradients are used, then resolution for different analyte ranges is improved, but costs increase and batch-to-batch reproducibility deteriorates
Solution Approach 1:
The patent introduces dynamic control of the separation medium properties. By adjusting the charge density, size distribution, and fluid flow characteristics of the bead-containing medium, the system can adapt to different analyte ranges and maintain consistent performance across batches. This dynamic adjustability eliminates the need for multiple specialized gels and improves batch-to-batch reproducibility.
Solution Approach 2:
The patent changes the physical and chemical parameters of the separation medium (such as bead charge, fluid viscosity, and flow rate) to optimize for different analyte characteristics. This parameter flexibility allows a single medium type to handle various separation tasks, reducing costs and improving reproducibility compared to using multiple specialized gels.
3Reliability
If gel pores are used for separation, then molecular filtering is achieved, but large proteins have difficulty migrating through the pores causing slow analysis
Solution Approach 1:
The patent replaces the physical pore structure of gels with a field-based separation mechanism using charged beads and fluid flow. This substitution eliminates the pore size limitations that slow down large protein migration, as separation is achieved through electrostatic interactions and fluid dynamics rather than physical filtration through narrow pores.
Solution Approach 2:
The patent uses fluid flow and hydraulic forces to drive the migration of molecules through the separation medium. By employing fluid dynamics rather than relying on passive diffusion through gel pores, the system achieves faster migration rates for large proteins while maintaining effective separation capability.
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 reduces costs, improves reproducibility, and accelerates analysis by allowing dynamic proton concentration control, enabling quicker separation and higher throughput of analytes without the sieving effects associated with traditional gel-based methods.
Implementation Method 1
Each cell is configured to independently produce a specified proton concentration in an associated volume of the environment
Implementation Method 2
An electric potential is applied parallel to the proton concentration gradient between an isoelectric focusing anode and isoelectric focusing cathode. Molecules having a net positive charge migrate through the gel towards the anode while molecules having a net negative charge migrate through the gel towards the cathode
Implementation Method 3
Isoelectric focusing is an analytical technique for separating molecules in an analyte sample by taking advantage of the differing ionic properties of the molecules
Data Source
AI summary
A specified proton concentration in a volume (80) is produced by passing a controlled electrophoresis current through an adjacent electrophoresis volume (28) between a working electrode (26) and a counter electrode (24). An array of such volumes with specified proton concentration is used to provide the pH gradient for isoelectric focusing.