Low Dead Volume Extraction Column for Biomolecule Purification
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Solution Overview
Problem
Current methods for purifying and concentrating biomolecules from small volume samples often result in sample loss and inefficiency due to the need for removing interfering contaminants, particularly in proteomics and other analytical contexts.
Innovation Solution
The development of extraction columns with a packed bed of gel-type resin beads, featuring a low dead volume design, where a bed of extraction media with an affinity for the analyte is used, allowing for efficient purification and concentration of biomolecules through affinity binding and desorption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional solid phase extraction methods are used for purifying and concentrating biomolecules from small volume samples, then purification and concentration can be achieved, but sample loss increases and efficiency decreases due to the need for removing interfering contaminants
Solution Approach 1:
The invention extracts and removes interfering contaminants from the sample matrix through selective binding to the extraction media, separating them from the analyte of interest. This allows the analyte to be recovered with minimal loss while eliminating substances that would interfere with downstream analysis
Solution Approach 2:
The extraction media is specifically designed with local quality - using affinity ligands or selective binding groups that are tailored to bind specific analytes or interferents based on their chemical or biological properties. This localized selective binding enables precise purification without affecting other components
2Quantity of substance
If traditional extraction columns with larger bed volumes are used, then contaminant removal capacity increases, but sample loss increases and concentration efficiency decreases
Solution Approach 1:
The invention changes the parameters of the extraction column by reducing the bed volume to minimal necessary dimensions (e.g., 0.5-5 mL) while optimizing other parameters such as extraction media loading, flow rates, and buffer compositions to maintain or enhance contaminant removal capacity within the smaller volume
Solution Approach 2:
The extraction media employs composite materials combining support matrices (e.g., silica, polymer beads) with functional ligands or binding groups that provide high selectivity and capacity for contaminant binding, enabling effective purification in reduced volumes
3Productivity
If higher flow rates are used to improve processing speed, then productivity increases, but back pressure increases and may compromise extraction efficiency
Solution Approach 1:
The invention employs dynamic optimization of flow rates during different stages of the extraction process - using higher flow rates during loading and washing stages when back pressure is acceptable, and adjusting flow rates during elution stages to maintain extraction efficiency while maximizing overall processing speed
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 enables effective enrichment and concentration of biomolecules with minimal sample loss, facilitating high linear flow rates and low back pressure, thereby improving the efficiency of sample preparation for analytical technologies like mass spectrometry.
Implementation Method 1
a bed of extraction media having a volume of less than about 100 μL... gel-type beads derivatized with a group having an affinity for an analyte of interest
Data Source
AI summary
The invention provides extraction columns for the purification of an analyte (e.g., a biological macromolecule, such as a peptide, protein or nucleic acid) from a sample solution, as well as methods for making and using such columns. The columns typically include a bed of extraction media positioned in the column between two frits. In some embodiments, the extraction columns employ modified pipette tips as column bodies. In some embodiments, the method involves adjusting the head pressure of the column during the process, or otherwise controlling or regulating the head pressure.