Solution Phase Isoelectric Focusing Device for Protein Prefractionation
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Solution Overview
Problem
Current analytical techniques, such as 2D PAGE, struggle to resolve the complexity of eukaryotic proteomes due to limited spatial resolution, leading to obscured detection of low abundance protein species, and existing devices for solution phase isoelectric focusing lack convenience and effectiveness for small volume protein samples.
Innovation Solution
A solution phase isoelectric focusing device with a simple assembly mechanism using screw cap components, fixed pH membrane disks, and a loading tube design that aligns sample chambers coaxially, minimizing leaks and air bubbles, and allowing for easy disassembly and cleaning, along with optional agitation during electrophoresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 2D PAGE is used to analyze protein mixtures, then protein separation is achieved, but spatial resolution is limited causing high abundance species to obscure low abundance species
Solution Approach 1:
The device divides the protein mixture into multiple discrete chambers separated by pH gradient membranes, allowing proteins to be separated by isoelectric point into distinct fractions. This segmentation enables low abundance proteins to be detected without obscuration by high abundance proteins, as each chamber contains a specific pH-range separated fraction.
Solution Approach 2:
The device performs preliminary fractionation of the protein mixture by isoelectric point before the main 2D PAGE analysis. By pre-separating proteins into pH-based fractions using the multi-chamber device with pH gradient membranes, the subsequent 2D PAGE analysis is performed on pre-sorted samples, eliminating the obscuration problem.
2Measurement precision
If solution phase isoelectric focusing devices are used for prefractionation, then protein separation by pI is achieved, but device complexity and ease of operation are poor for small volume samples
Solution Approach 1:
The device uses a modular multi-chamber configuration where each chamber can be independently filled with sample and buffer solutions. The chambers are separated by pH gradient membranes and can be assembled in a straightforward manner, making the device easy to operate for small volume samples while maintaining effective pI-based fractionation.
Solution Approach 2:
The device utilizes pH gradient membranes that create distinct pH ranges in each chamber. By changing the pH parameter across the membranes, the device achieves effective protein separation by isoelectric point without requiring complex mechanical or operational systems, simplifying device operation.
3Difficulty of detecting and measuring
If protein load is increased to detect low abundance species, then detection sensitivity improves, but spatial resolution decreases due to obscuration
Solution Approach 1:
The device segments the protein mixture into discrete pH-based fractions before analysis. This segmentation allows the total protein load to be increased for better detection sensitivity while maintaining spatial resolution, because the high abundance proteins are separated into different chambers from low abundance proteins, preventing obscuration during detection.
Solution Approach 2:
The device performs preliminary separation of proteins by isoelectric point before the detection step. This pre-fractionation allows subsequent detection to be performed on enriched samples with high abundance proteins removed from the detection path of low abundance proteins, enabling both high sensitivity and high spatial resolution.
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 device enables efficient prefractionation and characterization of proteins by preventing leaks and air bubbles, allowing for effective separation and fractionation of small volume protein samples with improved resolution and reduced contamination, enhancing the detection of low abundance proteins.
Implementation Method 1
solution phase electrophoresis device, components, and methods
Implementation Method 2
solution phase isoelectric focusing (IEF)
Data Source
AI summary
A device for fluid phase electrophoresis, particularly solution phase isoelectric focusing, components thereof, and methods for use are presented.