Microfluidic ESI-MS Interface With Feedback Voltage Stabilization
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Solution Overview
Problem
Current methods for interfacing protein sample preparation techniques with mass spectrometers, such as liquid chromatography and electrospray ionization, face limitations in handling intact proteins and maintaining constant voltage at the electrospray ionization tip, leading to suboptimal data quality and characterization of analyte fractions.
Innovation Solution
The implementation of methods that maintain a constant voltage at the electrospray ionization tip through feedback loops adjusting voltages in a separation channel, combined with imaging techniques to monitor and adjust electrospray performance, allowing for improved characterization and correlation of chemical separation data with mass spectrometry data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrospray ionization is used to introduce samples into a mass spectrometer, then sample introduction efficiency is improved, but voltage stability at the ESI tip deteriorates due to changing internal fluid resistances
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the voltage at the ESI tip and adjusts the applied voltage to compensate for changes in internal fluid resistance. This feedback mechanism maintains stable voltage conditions despite variations in fluid resistance during the analysis process.
Solution Approach 2:
The system dynamically changes the voltage parameter in response to measured resistance changes. By adjusting the voltage based on real-time resistance measurements, the system maintains optimal electrospray conditions throughout the analysis.
2Manufacturing precision
If capillaries are used for ESI, then droplet volume control is improved, but multi-step sample processing capability deteriorates due to linear flow path limitation
Solution Approach 1:
The patent divides the sample processing into distinct segments or steps that occur sequentially. The microfluidic device is configured to perform different operations (mixing, separation, concentration) in different zones, allowing multi-step processing while maintaining precise droplet control.
Solution Approach 2:
The invention transitions from a simple linear capillary to a microfluidic device with multi-dimensional channel networks. This allows samples to undergo multiple processing steps by routing them through different pathways and zones within the device, expanding functionality beyond the linear constraint.
3Ease of operation
If microfluidic devices are used for sample prep, then control and complexity of fluid manipulations is improved, but characterization of separated analyte fractions deteriorates due to limited detection tools
Solution Approach 1:
The patent combines multiple functions within the microfluidic device, including separation, concentration, and direct mass spectrometry detection. By integrating these functions, the system maintains excellent fluid control while achieving precise characterization of analyte fractions through the coupled MS detection.
4Weight of moving object
If liquid chromatography is used for protein sample preparation, then sample separation is improved, but data reconstruction complexity deteriorates due to large number of fractions
Solution Approach 1:
The patent extracts or eliminates the need for extensive fraction collection and post-run data reconstruction by directly coupling the separation device to mass spectrometry. This allows for real-time detection and simplifies data analysis while maintaining separation efficiency.
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 quality of electrospray ionization mass spectrometry data by maintaining stable electrospray conditions and providing more accurate characterization of analyte peaks, improving the correlation between chemical separation and mass spectrometry data, particularly for biologics and biosimilars.
Implementation Method 1
electrospray ionization (ESI). In ESI, small droplets of sample and solution are emitted from a distal end of a capillary or microfluidic device comprising an electrospray feature
Implementation Method 2
The droplet stretches and expands in this induced electric field to form a cone shaped emission (i.e., a 'Taylor cone') which comprises increasingly small droplets that evaporate and produce the gas phase ions
Implementation Method 3
performing a separation reaction to separate a mixture of analytes, wherein the separation reaction takes place within the separation channel
Data Source
AI summary
Methods, devices, and systems for improving the quality of electrospray ionization mass spectrometer (ESI-MS) data are described, as are methods, devices, and systems for achieving improved correlation between chemical separation data and mass spectrometry data.