Open Channel Solid Phase Extraction for Biomolecule Purification
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Solution Overview
Problem
Current solid phase extraction methods are inadequate for efficiently purifying and concentrating non-polynucleotide biomolecules like polypeptides and polysaccharides, which are often present in low concentrations and contaminated with other cellular constituents, requiring effective sample preparation techniques for analysis.
Innovation Solution
The use of open channel solid phase extraction channels, such as capillaries, where a sample solution interacts with an extraction surface for adsorption and subsequent elution with a desorption solution, allowing for the enrichment, concentration, and purification of biomolecules, including proteins and nucleic acids, while minimizing sample loss and preserving native protein function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional packed column solid phase extraction is used, then analytes can be adsorbed and concentrated, but sample loss occurs and native protein function may be compromised
Solution Approach 1:
The patent uses an open-channel capillary structure with extraction surface coating instead of packed columns, creating a thin film interface that reduces sample loss while maintaining adsorption efficiency. The open channel design allows complete solvent evacuation and minimizes dead volumes where sample could be lost.
Solution Approach 2:
The patent employs controlled changes in solvent composition and flow conditions to optimize analyte adsorption and subsequent elution. By adjusting pH, ionic strength, and organic solvent content, the system achieves high recovery rates while maintaining protein native state.
2Quantity of substance
If conventional solid phase extraction is used, then analytes can be purified, but large volumes of solvent are required and sample concentration is reduced
Solution Approach 1:
The patent implements nested desorption where a small volume of strong desorption solvent is introduced, followed by a larger volume of weaker solvent that displaces the analyte into a final small volume collection fraction. This nested approach concentrates the analyte while using minimal total solvent volumes.
Solution Approach 2:
The patent transitions from bulk solvent processing to capillary-scale processing, utilizing the third dimension (capillary length) to achieve high surface area to volume ratios. This allows efficient extraction with minimal solvent volumes and produces highly concentrated analyte fractions.
3Reliability
If packed columns are used for protein purification, then analytes can be separated from contaminants, but device complexity and sample handling requirements increase
Solution Approach 1:
The patent extracts the stationary phase from the conventional packed column design, using only an open-channel capillary with extraction surface coating. This eliminates column packing complexity, frits, and associated sample loss issues while maintaining purification efficiency through surface-mediated adsorption.
Solution Approach 2:
Instead of packing solid phase material into a column, the patent inverts the approach by coating the capillary surface with extraction material and using the open channel as the flow path. This simplifies the device structure while achieving equivalent or superior purification performance.
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 method enables the efficient purification and concentration of biomolecules, reducing sample loss and maintaining native protein integrity, facilitating analysis techniques like MS, SPR, and X-ray crystallography by providing a high enrichment factor and small volume of pure analyte.
Implementation Method 1
a sample solution is introduced into the extraction channel in any manner that permits the analyte to interact with and adsorb to an extraction surface coating the surface of the channel
Implementation Method 2
a solvent is used to desorb the molecules of interest and form a concentrated solution
Data Source
AI summary
The invention provides, inter alia, methods, devices and reagents for the preparation of native and non-denatured biomolecules using solid-phase extraction channels. The invention is particularly suited for the purification, concentration and/or analysis of protein analytes. The invention further provides, inter alia, methods, devices and reagents for the purification, concentration and/or analysis of multi-protein complexes.