Modular Analyte Concentrator-Microreactor for Capillary Electrophoresis
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Solution Overview
Problem
Current capillary electrophoresis instruments face challenges in sensitivity, particularly for analytes at sub-nanomolar concentrations, and have low throughput, making it difficult to efficiently isolate, purify, and concentrate proteins and peptides in complex biological samples.
Innovation Solution
A modular, multi-task immunoaffinity device is integrated into a cartridge-cassette connected to a capillary electrophoresis instrument, featuring a staggered-shaped analyte concentrator-microreactor with affinity ligands immobilized on a solid support, allowing for on-line concentration and separation of analytes, enhancing sensitivity and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If miniaturized instruments and devices are used, then sample volume and reagent consumption are reduced, but sensitivity for detecting analytes at low concentrations deteriorates
Solution Approach 1:
The device is segmented into distinct functional modules: a large-volume sample loading chamber, a concentration chamber with affinity ligands, and a separation capillary. This segmentation allows the sample volume to be reduced in the detection zone while maintaining a larger volume in the loading zone, thus improving sensitivity without compromising the miniaturized instrument's low sample volume requirement.
Solution Approach 2:
The device performs preliminary concentration of analytes using affinity ligands (antibodies, aptamers, or molecularly imprinted polymers) in the concentration chamber before separation and detection. This preliminary action enriches the analyte concentration in a small volume, thereby improving detection sensitivity while maintaining the benefits of miniaturization.
2Reliability
If conventional separation instruments are used, then separation capability is maintained, but throughput and analysis time are reduced
Solution Approach 1:
The device merges sample preparation (concentration and purification) and separation functions into a single integrated microfluidic platform. This consolidation eliminates the need for separate bulk instrumentation and multiple manual transfer steps, thereby increasing throughput and productivity while maintaining reliable separation capability through the integrated capillary electrophoresis system.
Solution Approach 2:
The device transitions from conventional two-dimensional separation (chromatography) to capillary electrophoresis, which adds the dimension of charge-based separation. This enables simultaneous separation based on size and charge, improving separation capability and reducing analysis time, thus increasing throughput.
3Reliability
If affinity ligands are immobilized on solid support, then selectivity for target analytes is improved, but device complexity increases
Solution Approach 1:
The device employs universal affinity ligand platforms (antibodies, aptamers, or molecularly imprinted polymers) that can be applied to detect multiple different analytes by simply changing the ligand type. This multi-functionality approach maintains high selectivity for various targets while avoiding the need for complex analyte-specific device designs, thereby controlling overall device complexity.
4Productivity
If on-line concentration and separation are performed, then sensitivity and throughput are improved, but device complexity increases
Solution Approach 1:
The device merges concentration and separation operations into a single continuous on-line process within the microfluidic chip. The concentration chamber directly feeds into the separation capillary, eliminating intermediate transfer steps. This integration improves throughput by performing both operations continuously while keeping the device structure relatively simple through the use of standard microfluidic fabrication techniques.
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 solution significantly improves the detection and quantification of analytes at low concentrations, increasing the efficiency and accuracy of protein and peptide analysis in biological samples, enabling better biomarker detection and characterization.
Implementation Method 1
A staggered-shaped analyte concentrator-microreactor device is positioned at the intersection of a transport capillary and a separation capillary. The device contains affinity ligands to isolate, purify, and concentrate one or more target compounds of interest
Implementation Method 2
a capillary electrophoresis instrument for the isolation, enrichment, separation, identification and characterization of protein and peptide biomarkers
Data Source
AI summary
The present invention relates to an immunoaffinity device for capturing, isolating and purifying one or more analytes of interest present at high or low concentration in simple or complex matrices. The device is designed as an integrated modular unit that includes one or more analyte concentrator-microreactor devices anchored into a T-shaped support box, which is built-in or connected to a interchangeable cartridge-cassette of a capillary electrophoresis or liquid chromatography apparatus for the isolation, enrichment, derivatization, separation and characterization of small molecules and polymeric macromolecules, primarily protein and peptide biomarkers. The integrated modular unit is also designed to perform metabolic or bioactivity studies.