Microfluidic Isoelectric Focusing for Low-Dilution Analyte Characterization
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Solution Overview
Problem
Current methods for separating and characterizing analytes in complex mixtures are cumbersome, often leading to analyte dilution beyond detection sensitivity and complications in interfacing with analytical equipment.
Innovation Solution
The use of microfluidic devices with switchable electrodes to control the electrophoretic introduction of a mobilization electrolyte into a separation channel, allowing for improved separation and characterization of analytes through isoelectric focusing and subsequent mobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple orthogonal enrichment steps are performed to separate analyte components from complex mixtures, then the complexity of downstream analysis is reduced, but the analyte is diluted to a concentration beyond the detection sensitivity of downstream analytical equipment
Solution Approach 1:
The patent combines multiple orthogonal enrichment steps (chromatographic separation and electrophoretic separation) into a single integrated microfluidic device, allowing sequential separation operations to be performed without transferring samples between different devices, thereby maintaining analyte concentration while reducing downstream analysis complexity
Solution Approach 2:
The microfluidic device is designed to perform multiple functions including sample injection, chromatographic separation, electrophoretic separation, and direct interfacing with mass spectrometer, eliminating the need for multiple separate enrichment devices and maintaining analyte concentration throughout the process
2Quantity of substance
If known enrichment methods and devices are used to separate analyte components, then sample fractions enriched for specific analyte components are obtained, but the process is cumbersome and complicates interfacing with analytical equipment
Solution Approach 1:
The patent integrates chromatographic separation, electrophoretic separation, and mass spectrometry interfacing into a single microfluidic device, eliminating the need for multiple separate enrichment steps and simplifying the overall process while maintaining enrichment effectiveness
Solution Approach 2:
The microfluidic device serves as an intermediary between sample preparation and mass spectrometry analysis, providing a streamlined interface that directly couples separation functions with detection, thereby reducing process complexity while maintaining analyte enrichment
3Quantity of substance
If capillary-based electrospray ionization is used to introduce samples into mass spectrometer, then a convenient volume and size are provided, but the linear flow path does not allow for multi-step processing
Solution Approach 1:
The microfluidic device is segmented into multiple functional zones including chromatographic separation section, electrophoretic separation section, and electrospray ionization interface, allowing sequential multi-step processing while maintaining compact size and convenient sample volume
Solution Approach 2:
The patent transitions from the linear one-dimensional flow path of capillaries to a two-dimensional microfluidic channel network, enabling multiple separation steps to be performed in sequence while maintaining compact device size and convenient sample volume
4Ease of operation
If microfluidic devices are used to provide fluidic channels for sample preparation, then additional control and complexity are achieved, but limited characterization of separated analyte fractions is provided prior to introduction to mass spectrometer
Solution Approach 1:
The device incorporates imaging capability that provides real-time feedback on the position and separation quality of analyte fractions, allowing optimization of electrophoretic parameters and ensuring proper fraction collection before mass spectrometry analysis
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 enhances the reproducibility, accuracy, and precision of analyte separation and characterization, improving the correlation with downstream analytical data such as mass spectrometry.
Implementation Method 1
The use of microfluidic devices with switchable electrodes to control the electrophoretic introduction of a mobilization electrolyte into a separation channel
Implementation Method 2
allowing for improved separation and characterization of analytes through isoelectric focusing and subsequent mobilization
Data Source
AI summary
Devices and methods for characterization of samples are provided. Samples may comprise one or more analytes. Some methods described herein include performing enrichment steps on a device. Some methods described herein include performing mobilization of analytes. Analytes may then be further processed and characterized.