Deuterated Analyte Analog Mass Spectrometry Quantification
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Solution Overview
Problem
Mass spectrometry analysis faces challenges such as matrix effects and isobaric interferences, particularly in complex samples, which can lead to erroneous results and poor analytical accuracy due to deuterium scattering of deuterated internal standards.
Innovation Solution
A method involving ionizing an analyte and its deuterated analog, monitoring the deuterated analog ion through fragmentation and deuterium scattering, and using specific mass transitions to determine the analyte amount, thereby addressing matrix effects and isobaric interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deuterated internal standards are used to correct signal deviation, then analytical accuracy is improved, but deuterium scattering increases unpredictability
Solution Approach 1:
The patent changes the mass-to-charge ratio parameter by using heavy isotopes (deuterium, carbon-13, nitrogen-15, sulfur-34) to create internal standards with distinct mass signatures. This allows differentiation between analyte and internal standard ions, enabling accurate quantification despite deuterium scattering effects through monitoring of specific mass transitions that account for the isotopic labeling pattern
Solution Approach 2:
The deuterated internal standard acts as an intermediary that experiences the same matrix effects and ionization conditions as the analyte but can be distinguished by its mass. By monitoring specific mass transitions and using the ratio of analyte to internal standard signals, the method corrects for signal deviation while accounting for deuterium scattering through the known isotopic composition
2Measurement precision
If deuterated analogs are used as internal standards, then signal deviation correction is achieved, but isobaric interferences complicate measurement
Solution Approach 1:
The patent uses multiple heavy isotopes (deuterium, carbon-13, nitrogen-15, sulfur-34) to create internal standards with unique mass-to-charge ratios that are sufficiently separated from interfering ions. This mass separation allows selection of monitoring transitions that avoid isobaric interferences while maintaining the ability to correct for signal deviation
Solution Approach 2:
The patent segments the mass spectrum by monitoring specific mass transitions that are characteristic of the deuterated internal standard and analyte. By selecting specific precursor ion to product ion transitions, the method isolates the analyte and internal standard signals from isobaric interferences, allowing accurate quantification through transition-specific detection
3Measurement precision
If matrix effects are present in complex samples, then ionization efficiency is altered, but analytical linearity and reproducibility deteriorate
Solution Approach 1:
The deuterated internal standard serves as an intermediary that co-elutes with the analyte and experiences identical matrix effects during ionization. By comparing the signal ratio of analyte to internal standard, the method corrects for ionization efficiency alterations caused by matrix effects, thereby maintaining analytical linearity and reproducibility across different sample matrices
Solution Approach 2:
The patent introduces isotopically labeled internal standards with known concentrations that undergo the same matrix effects as the analyte. By measuring the response factor ratio between analyte and internal standard, the method compensates for matrix-induced variations in ionization efficiency, ensuring consistent analytical performance
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 improves the accuracy and reliability of mass spectrometry analysis by utilizing deuterium scattering to generate unique mass transitions, minimizing interference and enhancing the measurement of analytes in complex samples.
Implementation Method 1
ionizing an analyte from the sample and a deuterated analog of the analyte to produce an analyte ion and a deuterated analog ion
Implementation Method 2
the deuterated analog undergoes fragmentation and deuterium scattering during mass spectrometry
Implementation Method 3
the deuterated analog undergoes fragmentation and deuterium scattering during mass spectrometry
Data Source
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AI summary
A method for determining an amount of an analyte in a sample by mass spectrometry can include the steps of (i) ionizing an analyte from the sample and a deuterated analog of the analyte, to produce an analyte ion and a deuterated analog ion, where the deuterated analog undergoes fragmentation and deuterium scattering during mass spectrometry; (ii) measuring an analyte ion signal and a deuterated analog ion signal by mass spectrometry, where the deuterated analog ion signal is measured using a mass transition resulting from fragmentation and deuterium scattering; and (iii) determining an amount of analyte in the sample using the analyte ion signal and the deuterated analog ion signal. Corresponding kits can include instructions for carrying out the method, together with a deuterated analog of the analyte selected to undergo fragmentation and deuterium scattering during mass spectrometry and exhibit a mass transition resulting from fragmentation and deuterium scattering.