Mass Spectrometer Calibration Composition for Broad Mass Range
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Solution Overview
Problem
Current mass spectrometer calibrants often fail to span a large mass range, are not ionizable in both positive and negative ion modes, and do not work in both electrospray (ESI) and atmospheric pressure chemical ionization (APCI) modes, requiring multiple sets of compounds for calibration.
Innovation Solution
A calibration composition comprising a mixture of discrete polyethylene glycol (dPEG) compounds with amino and carboxylic acid groups, along with specific solvents like acetonitrile and water, enabling calibration across a range of 145 to 3500 Da in both positive and negative ionization modes for APCI and ESI mass spectrometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of calibrant compounds are used for different ionization modes and mass ranges, then calibration accuracy is improved, but device complexity and calibration time increase
Solution Approach 1:
The patent applies universality by designing a single calibrant composition that functions across multiple ionization modes (positive and negative) and covers a broad mass range (145-3500 Da). The calibrant mixture includes compounds with diverse ionization properties, allowing one composition to replace multiple traditional calibrant sets, thereby reducing system complexity while maintaining calibration accuracy across different operational conditions
Solution Approach 2:
The patent merges multiple calibrant compounds into a single unified composition. By combining compounds with different mass ranges and ionization characteristics into one mixture, the patent eliminates the need to switch between separate calibrant sets, simplifying the calibration process while ensuring accurate calibration across the full mass range and both ionization modes
2Loss of time
If a single calibrant composition is used for broad mass range calibration, then calibration time is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the calibrant composition into multiple discrete compound components, each contributing to specific mass ranges. The mixture includes compounds segmented across different mass regions (e.g., lower mass compounds like 7-aminoheptanoic acid and higher mass compounds like phosphazene 1521), allowing the single composition to provide accurate calibration points throughout the entire 145-3500 Da range simultaneously
Solution Approach 2:
The patent uses a composite calibrant material consisting of multiple compounds with complementary properties. This composite approach ensures that the single composition provides distributed calibration points across the full mass range, maintaining measurement precision while enabling simultaneous calibration across broad mass ranges without requiring multiple separate calibrant applications
3Measurement precision
If calibrants are optimized for specific ionization modes, then calibration accuracy for that mode is improved, but adaptability to other modes decreases
Solution Approach 1:
The patent applies local quality by selecting individual calibrant compounds with specific ionization characteristics suited for their optimal ionization mode. The positive ion mode calibrants (e.g., phosphazene 921, phosphazene 1521) are chosen for their protonation efficiency, while negative ion mode calibrants (e.g., 7-aminoheptanoic acid, sulfinpyrazone) are selected for their deprotonation or electron capture efficiency. This localized optimization within the composite ensures high calibration accuracy for each mode while maintaining overall versatility
Solution Approach 2:
The patent achieves universality by creating a calibrant composition that simultaneously provides compounds effective for both positive and negative ionization modes. The mixed composition includes compounds that can serve dual purposes or mode-specific compounds co-existing in the same mixture, allowing a single calibrant to function across multiple ionization modes without sacrificing mode-specific calibration accuracy
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
The solution provides accurate calibration across a broad mass range in both positive and negative ionization modes for APCI and ESI mass spectrometers, ensuring reliable and precise mass spectrometry measurements.
Implementation Method 1
the calibrant can be used in either positive or negative ionization mode
Data Source
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AI summary
A composition, method, and kit for calibrating a mass spectrometer including a predetermined concentration of a calibrant having a mixture of amino acid polyethylene glycol compounds and a solvent for dissolving the calibrant. The calibrant can be used in either positive or negative ionization mode, and it can be used in calibrating an atmospheric pressure chemical ionization or an electrospray mass spectrometer. The calibrant can include a mixture to enable calibration across a broad range of masses.