Isotope-Labeled Internal Calibrators for Low-Interference MS Quantification
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Solution Overview
Problem
Current mass spectrometry methods require multiple stable isotope labeled calibrators to avoid isotope interference, leading to high costs and inefficiencies in quantifying target analytes due to the need for extensive calibration and matrix matching.
Innovation Solution
The use of at least three isotopically labeled internal calibrators with masses differing by 1-9 units, where the lowest mass calibrator is at least 6 units greater than the target analyte, allowing for overlapping signal contributions to be accommodated and reducing the required concentration of calibrators for calibration curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometry methods use multiple stable isotope labeled calibrators to avoid isotope interference, then measurement precision is improved, but quantity of substance (calibrator cost) increases significantly
Solution Approach 1:
The patent combines multiple calibrators with overlapping isotope patterns into a single calibration mixture, where the isotopic contributions are mathematically deconvoluted. Instead of using separate calibrators for each analyte, multiple calibrators are merged into one composition that simultaneously calibrates multiple analytes, reducing the total amount of stable isotope labeled calibrators needed while maintaining measurement precision through computational resolution of overlapping signals.
Solution Approach 2:
The patent creates a universal calibration composition that serves multiple functions: it calibrates multiple different analytes simultaneously, accommodates overlapping isotope patterns, and provides a matrix-matched calibration environment. This single multi-functional calibration mixture replaces the need for multiple separate calibrators, reducing both cost and complexity while maintaining quantification accuracy across different analytes.
2Reliability
If multiple stable isotope labeled calibrators are used to establish calibration curves, then reliability of quantification is improved, but device complexity and procedure complexity increase
Solution Approach 1:
The patent merges multiple calibration standards into a single composition that can be added to all samples uniformly. This unified calibration approach eliminates the need for separate calibration procedures for different analytes, simplifying the workflow while maintaining reliability through mathematical deconvolution of the combined isotopic signals.
Solution Approach 2:
The patent changes the approach from physical separation of calibrators to mathematical separation of isotopic signals. By using computational deconvolution of mass spectral data, the method transforms a complex physical calibration procedure into a simplified mathematical analysis, reducing procedural complexity while maintaining quantification reliability.
3Measurement precision
If stable isotope labeled calibrators with mass difference of at least 6 units are used, then selectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses a universal calibration composition that works across multiple analytes with different mass spectra. The mathematical deconvolution approach accommodates various mass differences and isotopic patterns, reducing the stringency of manufacturing precision requirements for individual calibrators while maintaining overall selectivity through computational analysis.
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 decreases the amount of calibrators needed for analysis, reducing costs and increasing productivity by enabling matrix-matched calibration and minimizing isotope interference, thus enhancing the efficiency and accuracy of mass spectrometry quantification.
Implementation Method 1
quantifying a target analyte in a sample by mass spectrometry
Data Source
AI summary
Provided herein are methods and systems directed to stable, isotopically labeled internal calibrators for use in mass spectrometry analysis for quantifying a target analyte in a sample. The present disclosure relates more particularly to mass spectrometry analysis where a single sample includes at least three isotopically labeled internal calibrators and the target analyte. The methods and systems described herein allows accommodation of isotope interferences arising from the use of isotopically labeled internal calibrators in quantification a target analyte. As a result, smaller quantities (e.g., lesser concentration) of isotopically labeled internal calibrators are utilized in the present technology in the generation of a calibration curve to quantify a target analyte.