Step-shaped pH gradient for rapid biomolecule focusing
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Solution Overview
Problem
Current isoelectric focusing techniques face challenges in efficiently concentrating biomolecules based on their isoelectric point (pI) due to gradual pH gradients, which result in prolonged focusing times and reduced accuracy in separating proteins.
Innovation Solution
A device and method utilizing a focusing container with electrolysis units to create a stable, step-shaped pH gradient with steep ramps, allowing biomolecules to concentrate along specific pH levels, and a removable solution cartridge with a porous block for segmenting concentrated biomolecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gradual pH gradient is used in isoelectric focusing, then the separation process is simpler to implement, but the focusing time is prolonged and accuracy is reduced
Solution Approach 1:
The pH gradient is segmented into discrete steps rather than being continuous. Multiple electrolysis units are positioned at different locations along the separation channel, each generating protons that create localized pH zones. These discrete pH steps (e.g., pH 3, 4, 5, 6, 7, 8, 9, 10) replace the traditional gradual gradient, enabling faster biomolecule focusing while maintaining separation capability.
Solution Approach 2:
Different regions of the separation channel are given different pH characteristics through strategically placed electrolysis units. Each electrolysis unit creates a localized proton source that establishes a specific pH zone at its position. This local control of pH quality allows biomolecules to be focused rapidly at their isoelectric points without requiring a long gradual gradient throughout the entire channel.
2Stability of the object's composition
If a gradual pH gradient is used in isoelectric focusing, then the gradient coverage is more continuous, but the separation accuracy and resolution are reduced
Solution Approach 1:
The continuous pH gradient is segmented into discrete pH steps created by individually controlled electrolysis units. Each unit generates protons that establish a distinct pH zone, creating a stepped gradient profile. This segmentation provides well-defined pH boundaries that improve the precision of biomolecule focusing at specific isoelectric points while maintaining adequate coverage across the full pH range.
Solution Approach 2:
The pH parameter is changed in discrete steps rather than continuously. By controlling the activation and current of individual electrolysis units, the system creates distinct pH levels (e.g., pH 3, 4, 5, 6, 7, 8, 9, 10) at different positions along the channel. This parameter discretization enhances separation accuracy by providing sharper pH transitions at each focal point.
3Productivity
If multiple electrolysis units are used to create step-shaped pH gradient, then the focusing speed and accuracy are improved, but the device complexity increases
Solution Approach 1:
Each electrolysis unit serves multiple functions: it generates protons to create localized pH zones, establishes electric field gradients for biomolecule migration, and can be independently controlled to adjust pH at specific positions. This multi-functionality reduces the need for separate pH control mechanisms for each zone, offsetting the complexity of having multiple units.
Solution Approach 2:
The system uses removable solution cartridges that can be discarded after use and replaced with fresh cartridges. This eliminates the need for complex cleaning and regeneration systems for the separation medium, reducing overall device complexity despite having multiple electrolysis units. The reusable electrolysis units combined with disposable cartridges provide a cost-effective and simple maintenance approach.
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 method enables rapid concentration and separation of biomolecules within 1000 seconds, improving resolution and accuracy by creating distinct segments for each biomolecule concentration, thus overcoming the limitations of gradual pH gradients.
Implementation Method 1
Each electrolysis unit is configured to inject an ion flow into the focusing container so as to create a pH gradient having a plurality of steps
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 electrolyte solution towards the cathode while molecules having a net negative charge migrate through the electrolyte solution towards the anode.
Implementation Method 3
The separated concentrations are absorbed in a porous block which may be segmented to provide separate sections containing different concentrations.
Data Source
AI summary
A device for isoelectric focusing. The device comprises a focusing container configured to contain an electrolyte solution and having a longitudinal axis and at least one electrolysis unit mounted in a close proximity to the longitudinal axis. Each electrolysis unit injects an ion flow into the focusing container so as to create a pH gradient having a plurality of steps in the electrolyte solution, along the longitudinal axis. Each step has a substantially uniform pH level and the pH gradient is defined by at least one pH ramp between every two sequential steps of the plurality of steps.