Stepped Collision Energy Scheme for Tandem Mass Spectrometry
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Solution Overview
Problem
Current tandem mass spectrometry methods face challenges in optimizing collision energies for each analyte, leading to suboptimal fragmentation and reduced detection sensitivity, especially in full-scan mode where multiple fragmentation events are required but not tailored to individual analytes.
Innovation Solution
The method involves determining optimal collision energies for each product-ion species and performing mass spectrometric analysis using the minimal number of fragmentation events necessary to achieve maximum fragmentation efficiency, allowing for tailored collision energy application to each analyte, either progressively increasing or decreasing, to ensure optimal fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single collision energy is used for fragmentation, then the analytical procedure is simple and fast, but some product-ion species are produced at low efficiency leading to reduced detection sensitivity
Solution Approach 1:
The patent divides the fragmentation process into multiple sequential steps, each at a different collision energy level. Instead of using a single collision energy for all product ions, the method segments the energy application into discrete stages (e.g., low, medium, high collision energies), allowing optimal fragmentation for different product-ion species while maintaining analytical efficiency.
Solution Approach 2:
The patent dynamically changes the collision energy parameter during the fragmentation process. By varying the collision energy across different accumulation events and using normalized collision energy values that scale with precursor ion mass, the system optimizes fragmentation efficiency for multiple product ions without requiring separate analyses for each energy level.
2Manufacturing precision
If multiple accumulation events are performed at different collision energies, then optimal fragmentation for all product ions is achieved, but the analytical time increases
Solution Approach 1:
The patent maintains continuous useful action by performing multiple accumulations at different collision energies in rapid succession without intermediate processing steps. The system continuously accumulates ions at different energy levels and processes them through the mass analyzer in a seamless workflow, maximizing instrument utilization and minimizing idle time between energy transitions.
Solution Approach 2:
The patent employs periodic alternation between different collision energy levels during the accumulation phase. By systematically cycling through predetermined collision energy values for each accumulation event, the method ensures all product ions are optimally fragmented while maintaining a rhythmic, efficient workflow that minimizes total analysis time.
3Measurement precision
If collision energy is optimized for each product-ion species, then detection sensitivity is maximized, but the device complexity and method complexity increase
Solution Approach 1:
The patent creates a universal fragmentation approach that works across diverse analyte types and mass ranges. By using normalized collision energy values and predetermined energy sequences that can be applied to any precursor ion, the method achieves optimal fragmentation for all product ions without requiring analyte-specific method development, thereby reducing overall system complexity while maintaining high detection sensitivity.
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 detection sensitivity and confidence by optimizing fragmentation conditions for each analyte, reducing the number of fragmentation events needed, thereby improving the efficiency of mass spectrometric analysis and maintaining high fragmentation quality.
Implementation Method 1
a first quadrupole (Q1) is set to transmit only a selected particular limited precursor-ion m/z range while filtering out all other ranges and, subsequently, the so-isolated selected precursor is fragmented at a particular collision energy in a second quadruple (q2) operated as a fragmentation cell
Data Source
AI summary
A method for mass spectrometry comprises: receiving or generating a respective value of an optimal collision energy for generating each one of a plurality of n product-ion species of interest from at least one precursor-ion species, each optimal collision energy corresponding to a respective maximum fragmentation efficiency; determining a number, m, wherein m<n, of precursor-ion collision energy values required to fragment all of the at least one precursor-ion species such that a fragmentation efficiency of each product-ion species of interest generated by the fragmentation is equal to the respective maximum fragmentation efficiency, within a pre-determined tolerance; and performing a mass spectrometric analysis that includes fragmenting the one or more precursor-ion species in a collision cell by imparting, in sequence, each of and only the m precursor-ion collision energy values to ions received from an ion source.