Matrix-Assisted Ionization Vacuum for Mass Spectrometry
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Solution Overview
Problem
Current ionization methods in mass spectrometry, such as MALDI and ESI, face limitations including high energy requirements, irreproducibility, and limited applicability to high-mass compounds like proteins, due to the need for lasers, high voltages, and expensive instrumentation, which restricts the analysis of fragile molecules and nonvolatile analytes.
Innovation Solution
The method of matrix-assisted ionization vacuum (MAIV) uses a small molecule matrix that spontaneously produces analyte ions at sub-atmospheric pressure without the need for high energy sources like lasers or high voltages, allowing for the analysis of a wide range of compounds, including proteins and peptides, using any mass spectrometer with minimal instrumental modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MALDI or ESI methods are used for ionization, then nonvolatile analytes can be analyzed, but high energy sources (lasers, high voltages) are required and instrumentation becomes expensive
Solution Approach 1:
The patent extracts the essential ionization function from complex laser-based MALDI systems and high voltage ESI systems, isolating the core mechanism of matrix-assisted ionization and transferring it to a simple vacuum environment where it can operate with minimal instrumentation
Solution Approach 2:
The matrix compound spontaneously ionizes the analyte in the vacuum environment without requiring external energy input from lasers or high voltage sources, making the system self-sufficient and eliminating complex energy delivery mechanisms
2Measurement precision
If MALDI is used with vacuum sources, then sensitivity is improved, but time-consuming sample introduction and expensive instrument modifications are required
Solution Approach 1:
The patent creates a universal ionization method that works with any standard mass spectrometer vacuum source without requiring instrument-specific modifications, making the technique broadly applicable across different platforms while maintaining high sensitivity
3Device complexity
If atmospheric pressure MALDI is used, then instrument cost is reduced, but ion loss at inlet aperture and reduced sensitivity occur
Solution Approach 1:
The patent utilizes the vacuum environment (inert atmosphere free of air molecules) as the medium for ionization and ion transport, eliminating air-related ion losses and chemical reactions that occur at atmospheric pressure, thereby maintaining high sensitivity without requiring expensive vacuum-specific instrumentation
4Device complexity
If MALDI produces singly charged ions, then analysis is simplified, but mass range is limited for high-mass compounds
Solution Approach 1:
The patent changes the ionization parameters by operating in vacuum conditions with matrix-assisted spontaneous ionization, which enables the formation of both singly and multiply charged ions, thereby extending the accessible mass range while maintaining analytical simplicity
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
MAIV enables the production of abundant singly or multiply charged ions, facilitating the analysis of complex mixtures and fragile molecules with improved sensitivity and reduced instrumental complexity, overcoming the limitations of existing methods by eliminating the need for expensive lasers and high voltage sources, and allowing for continuous ion formation without hot/cold spot issues.
Implementation Method 1
a matrix compound which spontaneously ionizes an analyte when exposed to sub-atmospheric pressure
Implementation Method 2
by first evaporating the analyte followed by gas-phase ionization
Implementation Method 3
by laser ablation of the analyte either directly or in a small molecule (chemical) matrix as in matrix-assisted laser desorption/ionization (MALDI)
Data Source
AI summary
An ionization method for use with mass spectrometry or ion mobility spectrometry is a small molecule compound(s) as a matrix into which is incorporated analyte. The matrix has attributes of sublimation or evaporation when placed in vacuum at or near room temperature and produces both positive and negative charges. Placing the sample into a region of sub-atmospheric pressure, the region being in fluid communication with the vacuum of the mass spectrometer or ion mobility spectrometer, produces gas-phase ions of the analyte for mass-to-charge or drift-time analysis without use of a laser, high voltage, particle bombardment, or a heated ion transfer region. This matrix and vacuum assisted ionization process can operate from atmosphere or vacuum and produces ions from large (e.g. proteins) and small molecules (e.g. drugs) with charge states similar to those observed in electrospray ionization.