Dynamic Collision-Gas Pressure Control for Mass Spectrometer Sensitivity
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Solution Overview
Problem
Conventional chromatograph mass spectrometers face challenges in achieving high sensitivity and quantitative accuracy during simultaneous multicomponent analysis due to suboptimal collision-gas pressure settings, especially when analyzing multiple compounds with overlapping elution times, which complicates the determination of optimal collision-gas pressure and reduces detection efficiency.
Innovation Solution
A chromatograph mass spectrometer system that includes a gas supplier, compound information storage, and an analysis controller to retrieve and control collision-gas pressure based on retention time information and optimal pressure settings for each compound, allowing for automatic adjustment of collision-gas pressure during analysis to maximize ion dissociation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed collision-gas pressure is set for simultaneous multicomponent analysis, then the analysis can be performed efficiently, but the detection sensitivity for individual compounds deteriorates due to suboptimal pressure settings
Solution Approach 1:
The collision-gas pressure is changed dynamically during the analysis based on the elution time of compounds. The system automatically adjusts the pressure to optimal values for different compounds as they elute from the chromatograph, transforming the static pressure setting into a dynamic, time-dependent parameter that adapts to the analysis needs.
Solution Approach 2:
Optimal collision-gas pressure values for multiple compounds are predetermined and stored in a table before the analysis begins. Based on the retention times of compounds, the system pre-prepares the pressure adjustment schedule, allowing automatic switching to optimal pressures when compounds elute, thus eliminating the need for manual optimization during analysis.
2Measurement precision
If the collision-gas pressure is optimized for each compound, then the detection sensitivity improves, but the complexity of setting and adjusting pressure increases significantly
Solution Approach 1:
The system performs self-service by automatically selecting and adjusting the collision-gas pressure based on predetermined optimal values stored in a table. The control unit automatically compares the current retention time with the stored retention time table and adjusts the pressure without requiring manual intervention, making the complex pressure optimization process transparent to the user.
Solution Approach 2:
A single collision-gas pressure control system serves multiple functions: it can be automatically controlled based on retention time matching, manually adjusted by users, or operated in constant pressure mode. The system universally handles different compounds with different optimal pressures through one integrated control mechanism.
3Measurement precision
If manual optimization of collision-gas pressure is performed for each compound, then optimal detection sensitivity is achieved, but the time and effort required for analysis increases
Solution Approach 1:
The system automatically performs the optimization task that would otherwise require manual intervention. By storing predetermined optimal pressure values and retention times in a table, the system self-adjusts the collision-gas pressure based on the eluting compound's retention time, eliminating the need for operators to manually optimize pressure for each compound during analysis.
Solution Approach 2:
All the tedious work of determining optimal collision-gas pressures for multiple compounds is performed in advance and stored in a table. During the actual analysis, the system simply retrieves and applies the pre-determined optimal pressures based on retention time matching, significantly reducing the time and effort required during the analysis phase.
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 system enables high sensitivity detection of ions from each compound, improving quantitative accuracy and reducing the time and effort required to determine optimal collision-gas pressures, even for compounds with overlapping elution times, by automatically setting collision-gas pressure to optimal levels.
Implementation Method 1
The precursor ion selected by the front quadrupole mass filter is given an appropriate amount of collision energy and introduced into the collision cell. Within this collision cell, the ion collides with the collision gas and undergoes the collision-induced dissociation process, whereby the product ions are produced.
Data Source
AI summary
A chromatograph mass spectrometer including an optimum gas pressure search controller that performs an MRM measurement for a target compound while changing a collision-gas pressure, investigates an optimum collision-gas pressure giving a highest signal strength based on the measured result, and stores the same gas pressure for each compound in a compound-related information storage section. When a target compound is specified in a simultaneous multicomponent analysis, a control sequence determiner reads the optimum collision-gas pressure and retention time information corresponding to the specified compound from the storage section, prepares a control sequence which sets the gas pressure in a collision cell at the optimum gas pressure at the timing where each compound is eluted, and stores the sequence in a control sequence storage section.