Dynamic Post-Column Reagent Addition for Mass Spectrometry Ionization
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Solution Overview
Problem
Current mass spectrometry methods do not effectively optimize ionization conditions for analytes during chromatographic separation, leading to suboptimal ionization efficiency and stability, as they do not dynamically vary reagent composition and concentration based on retention times and analyte-specific requirements.
Innovation Solution
A method and apparatus that dynamically vary the composition and concentration of reagents added to the eluent post-column during mass spectrometry, optimizing ionization conditions by switching between different charge carriers and reagents based on the retention times of specific analytes, thereby improving ionization efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reagent composition is used throughout the chromatographic run, then the device complexity is reduced, but the ionization efficiency for different analytes deteriorates
Solution Approach 1:
The patent implements dynamic reagent composition changes by controlling multiple reagent delivery systems to vary reagent types and concentrations based on retention time windows of different analytes. This allows the system to adapt ionization conditions to match the specific requirements of each analyte class (e.g., polar vs non-polar compounds) while maintaining automated operation through programmed sequences.
Solution Approach 2:
The system changes reagent parameters (composition and concentration) dynamically during the chromatographic run based on the elution characteristics of different analytes. Survey experiments are performed first to determine optimal reagent conditions for each analyte, then these parameters are applied during the actual analytical run by adjusting reagent delivery rates and compositions at predetermined retention time windows.
2Reliability
If post column reagent addition is used to optimize ionization, then the ionization efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent divides the reagent delivery into multiple independent channels, each capable of delivering different reagents at controlled rates. This segmentation allows different reagents to be added at different stages of the chromatographic run based on analyte retention times, enabling optimized ionization for each analyte class while maintaining independent control over each reagent delivery system.
Solution Approach 2:
Survey experiments are performed beforehand to determine the optimal reagent composition and concentration for each analyte of interest. The retention time windows and corresponding reagent conditions are established during these preliminary experiments, allowing the main analytical run to proceed with pre-programmed reagent addition sequences that optimize ionization without requiring real-time adjustments.
3Reliability
If reagent concentration is increased to improve ionization, then the ionization efficiency is improved, but the chemical noise increases
Solution Approach 1:
The patent applies different reagent concentrations locally tailored to each analyte's retention time window rather than using a uniform high concentration throughout. This allows the system to use higher reagent concentrations only when specific analytes are eluting (to maximize their ionization) while using lower concentrations during other periods (to minimize chemical noise), thereby optimizing the signal-to-noise ratio for each analyte.
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 ionization efficiency and reproducibility for analytes by tailoring ionization conditions to specific compounds, reducing chemical noise and improving mass spectral interpretation, while maintaining separation conditions.
Implementation Method 1
ionising the analyte sample including the one or more reagents
Data Source
AI summary
A method of ionizing a sample is disclosed comprising performing an initial experiment comprising: (i) adding one or more reagents to an analyte sample; (ii) varying the composition and/or concentration of the one or more reagents; (iii) ionizing the analyte sample including the one or more reagents; (iv) determining the composition and/or concentration of the one or more reagents which results in a desired, improved or optimized ionization or other condition or parameter for one or more analytes of interest; and (v) determining one or more first retention times or one or more first retention time windows for the one or more analytes of interest. The method then further comprises separating an analyte sample using a first separation device and during the course of a single experimental run or acquisition varying the composition and/or concentration of one or more reagents which are added to an eluent which emerges from the first separation device. The composition and/or concentration of the one or more reagents which are added to the eluent is varied at the one or more the first retention times or during the one or more the first retention time windows so that an ionization or other condition or parameter for the one or more analytes of interest is as desired or is improved or optimized.