Integrated ESI-MS Device Alignment and Segmentation
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Solution Overview
Problem
Existing analytical instruments using electrospray ionization and mass spectrometers face challenges with cross-talk and contamination, high cost, and complexity due to the need for precise alignment and additional energy inputs for high flow rates, which limits their scalability and efficiency.
Innovation Solution
The integration of nanospray capillaries, counter electrodes, and vacuum interfaces using microfabricated substrates for precise alignment, reducing the need for expensive assemblies and minimizing contamination, while allowing for lower flow rates that enhance ionization efficiency and reduce system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional HPLC/MS systems use postcolumn splitters to reduce flow rates to the ESI source, then the ESI source can operate at compatible flow rates, but the system complexity and cost increase due to additional components
Solution Approach 1:
The patent integrates the ESI source directly with the HPLC column outlet, eliminating the need for separate postcolumn splitters and flow division components. This merging of functions allows the system to operate at high flow rates (0.5-2 mL/min) directly from the column without requiring additional flow management hardware, thereby reducing system complexity while maintaining flow rate compatibility.
2Productivity
If multiplexed ESI-MS systems are used to increase throughput, then analysis speed improves, but cross-talk and cross-contamination between channels occur
Solution Approach 1:
The patent employs multiple independent ESI sources, each dedicated to a single HPLC channel, rather than sharing a common ESI source. This segmentation ensures complete isolation between channels, eliminating cross-talk and cross-contamination issues while maintaining high throughput through parallel operation of multiple independent systems.
3Reliability
If precise alignment of ESI components is implemented to improve ionization efficiency, then ion transmission increases, but manufacturing and assembly costs increase
Solution Approach 1:
The ESI source is integrated as an inherent component of the HPLC column assembly, with the electrospray capillary positioned at the column outlet. This merging eliminates the need for separate alignment procedures between independent ESI and HPLC components, as they are manufactured and assembled as a single integrated unit, thereby maintaining ionization efficiency while reducing manufacturing complexity and cost.
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 reduces manufacturing and assembly costs, improves ionization efficiency, and increases the mass range of analyzers, making the systems more cost-effective and scalable for high-throughput applications with minimal cross-talk and contamination.
Implementation Method 1
The introduction of Electrospray ionisation (ESI) greatly expanded the role of MS in pharmaceutical analysis. One of the characteristic features of ESI is the generation of multiply charged ions for large molecular weight compounds (e.g. proteins, peptides).
Implementation Method 2
An electric potential is applied between the capillary and a counter-electrode. The analyte solution extends from the tip of the capillary in a shape known as the Taylor cone. The applied potential accelerates charged droplets from this cone towards the counter-electrode.
Implementation Method 3
The droplets reduce by fragmentation or evaporation to individual ions, and these are accelerated, typically through an aperture in the counter-electrode, into the mass analyser.
Data Source
AI summary
An integrated analytical device is described. The device includes a plurality of components which are initially mounted or provided on support submounts. The submounts are then packaged onto a microbench, with the alignment of the submounts relative to the microbench being determined by alignment features provided on the microbench.