Capillary Device for Protein Analysis with Integrated Solid-Phase Extraction
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Solution Overview
Problem
Current methods for analyzing proteins using capillary isoelectric focusing face challenges such as interference from highly abundant proteins and salts, which mask target proteins and prolong separation times, and existing devices lack effective integration of solid-phase extraction with capillary isoelectric focusing.
Innovation Solution
A capillary device and microfluidic chip that directly connects a solid-phase extraction column with a capillary for isoelectric focusing, utilizing hydrophilic polymers and specific adsorbents to reduce electroosmosis and enhance sensitivity, allowing for precise separation and analysis of proteins based on isoelectric points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capillary isoelectric focusing is used to analyze biological samples, then high separation ability is achieved, but highly abundant proteins mask target proteins and cause precipitation during separation
Solution Approach 1:
The device is divided into two distinct functional segments: a solid-phase extraction column section for selective concentration and purification, and a capillary isoelectric focusing section for separation and detection. This segmentation allows the abundant proteins to be removed in the first section before analysis in the second section, resolving the contradiction between maintaining high separation ability and eliminating protein interference.
2Stability of the object's composition
If salts are present in the sample during capillary isoelectric focusing, then the separation pattern is maintained, but the time required for focusing is elongated
Solution Approach 1:
The solid-phase extraction column performs preliminary purification and concentration of the sample before it enters the capillary isoelectric focusing section. By removing salts and other interfering substances in advance, the focusing process can proceed quickly without the need to maintain stable separation patterns in the presence of high salt concentrations, thus reducing focusing time while preserving separation quality.
3Measurement precision
If solid-phase extraction and capillary isoelectric focusing are integrated, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The solid-phase extraction column and capillary isoelectric focusing device are merged into a single integrated capillary device with direct connection between the two sections. This merging eliminates the need for separate devices and manual sample transfer, reducing operational complexity while maintaining the sensitivity benefits of online concentration and separation.
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 solution enables the easy removal of interfering substances and allows for highly sensitive and precise separation and analysis of proteins and peptides, improving detection sensitivity and reducing analysis time by focusing on isoelectric points.
Implementation Method 1
introducing a sample to be analyzed into the solid-phase extraction column, thereby concentrating a target component in the sample on the solid-phase extraction column
Implementation Method 2
capillary isoelectric focusing should be noticed having high-separation ability and completing separation in a short time
Implementation Method 3
hydrophilic polymer is bound to the inner wall of said capillary for isoelectric focusing
Data Source
AI summary
A method for analyzing a protein and a peptide, includes: providing a capillary for isoelectric focusing; providing a capillary device for separation and analysis having the capillary and a solid-phase extraction column being unified as a single tube-like structure; providing an electrophoresis instrument having the capillary device and the mechanism regulating the pressure difference at both ends of the capillary device; introducing a sample containing a target protein or peptide into the solid-phase extraction column to let the target protein or peptide be adsorbed on the column, and filling the capillary device with a carrier ampholyte solution; starting separation by isoelectric focusing after eluting the target protein or peptide by filling the solid-phase extraction column with electrode solution or acid or base solution, or after firstly eluting the target protein or peptide with an eluting solution containing carrier ampholyte and secondly filling the solid-phase extraction column with electrode solution or acid or base solution; and focusing the eluted target protein or peptide in the capillary for isoelectric focusing.