Multi-Mode Ionization Assembly for Rapid Sequential Sample Analysis
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Solution Overview
Problem
Current mass spectrometry techniques face challenges such as high costs, complex sample preparation, and contamination issues, particularly when analyzing biological fluids or 'dirty' samples, which limit their widespread use.
Innovation Solution
The development of an ionization assembly that allows for fast sequential ionization of multiple samples using vacuum ionization methods, including matrix-assisted ionization (MAI), laserspray ionization (LSI), and matrix-assisted laser desorption/ionization (MALDI), while being compatible with atmospheric pressure ionization methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If atmospheric pressure ionization methods (ESI, APCI) are used, then compatibility with liquid chromatography and analysis of polar compounds is improved, but pumping capacity requirements and risk of contamination increase
Solution Approach 1:
The ionization process is segmented into two distinct pressure environments: atmospheric pressure ionization region and vacuum analysis region. The sample is ionized at atmospheric pressure using ESI or APCI methods, then ions are transferred through a differential pumping system to the vacuum region for mass analysis. This segmentation allows each region to be optimized independently for its specific function.
Solution Approach 2:
A differential pumping system with intermediate pressure regions acts as an intermediary between the atmospheric pressure ionization source and the high vacuum mass analyzer. This intermediary system gradually reduces pressure in stages, preventing direct exposure of the vacuum system to atmospheric pressure and reducing pumping capacity requirements.
2Productivity
If vacuum ionization methods (MALDI, LDI) are used, then sensitivity and speed of analysis are improved, but sample preparation complexity and cost increase
Solution Approach 1:
The mass spectrometer is designed with universal ionization capabilities that can accommodate both atmospheric pressure ionization (ESI, APCI) and vacuum ionization (MALDI, LDI) methods through a common interface and vacuum system. This multi-functionality allows the instrument to handle diverse sample types and preparation methods without requiring separate specialized instruments.
Solution Approach 2:
The system allows dynamic adjustment of operating parameters including pressure conditions, ionization voltage, and laser parameters to optimize performance for different ionization methods and sample types. Parameters such as source temperature, gas flow rates, and laser pulse duration can be modified to match specific analytical requirements.
3Adaptability or versatility
If multiple ionization methods are implemented, then versatility and coverage of analyte types are improved, but device complexity and operational cost increase
Solution Approach 1:
Multiple ionization methods (ESI, APCI, MALDI, LDI) are merged into a single integrated mass spectrometer platform with a common vacuum system, ion transfer interface, and mass analyzer. This consolidation provides versatile analyte coverage while reducing overall system complexity compared to using separate specialized instruments for each ionization method.
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 the time and cost of sample analysis, minimizes contamination and carryover, and enables high-throughput, sensitive, and reproducible analyses of small and large molecules without the need for extensive sample preparation.
Implementation Method 1
matrix-assisted laser desorption/ionization (MALDI)
Implementation Method 2
matrix-assisted laser desorption/ionization (MALDI)
Implementation Method 3
vacuum ionization methods
Data Source
AI summary
An ionizing system includes a flange device for connection to a mass spectrometer or ion mobility spectrometer having the property of providing a barrier between the lower pressure region of the spectrometer and a higher pressure region substantially at atmospheric pressure, and a channel therethrough providing fluid communication between the higher and lower pressure regions. A plate device independent of the flange device which can accommodate multiple samples, such as a sample plate device, when placed over the channel in the flange device substantially seals the channel Sliding the sample plate device while in intimate contact with the flange device provides a means to sequentially and rapidly expose said samples to the opening of the channel and thus the lower pressure region. Samples are ionized when exposed to the lower pressure region in as little as one sample per second using multiple ionization methods.