Isobaric Labeling Reagents for Steroid Quantitation
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Solution Overview
Problem
Current methods for quantitating steroids, such as immunoassays and traditional mass spectrometry techniques, face challenges including low sensitivity, interference from cross-reacting substances, and the need for expensive isotopically enriched internal standards, which limits the accuracy and efficiency of steroid analysis.
Innovation Solution
The development of a set of labels comprising compounds with heavy atom isotopes, used for isobaric or mass differential labeling, allows for the absolute quantitation of steroids without the need for isotopically enriched standards, utilizing parent-daughter ion transition monitoring (PDITM) for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mass spectrometry techniques are used for steroid quantitation, then detection capability is provided, but sensitivity is low and interference from cross-reacting substances occurs
Solution Approach 1:
The patent introduces isobaric labeling reagents as intermediaries that covalently attach to steroids to create differentially labeled analytes. These labels serve as mediators that enable mass spectrometric detection while the isobaric nature (same mass) of the labels prevents interference from cross-reacting substances, thereby improving both detection capability and sensitivity simultaneously
2Measurement precision
If isotopically enriched internal standards are used for absolute quantitation, then quantitation accuracy is improved, but costs increase and compatibility with tandem mass spectrometry is reduced
Solution Approach 1:
The patent creates isotopic copies of steroid analytes through chemical labeling with isobaric reagents rather than using expensive naturally occurring isotopically enriched standards. The labeling process generates analyte copies that have identical mass and chromatographic behavior but can be distinguished by MS/MS fragmentation patterns, achieving accurate quantitation without the need for costly isotopically enriched materials
Solution Approach 2:
The patent changes the mass-to-charge ratio parameter of the labeling reagents to be isobaric (same mass) rather than using traditional isotopically different masses. This parameter change enables the use of conventional mass spectrometry instruments without requiring expensive isotopically enriched standards while maintaining the ability to distinguish labeled from unlabeled analytes through fragmentation patterns
3Adaptability or versatility
If HPLC with derivatization is used for steroid analysis, then multiple steroids can be analyzed, but analysis time increases and sensitivity remains low
Solution Approach 1:
The patent performs preliminary labeling of multiple steroids with isobaric tags before mass spectrometric analysis. This preliminary action enables all steroids to be prepared in advance with uniform labeling, eliminating the need for time-consuming individual derivatization steps during analysis and enabling rapid multiplexed detection
4Ease of operation
If immunoassays are used for steroid quantitation, then ease of operation is maintained, but sensitivity is low and cross-reacting substances cause interference
Solution Approach 1:
The patent replaces the biological recognition mechanism of immunoassays (antibody-antigen binding) with a chemical labeling mechanism using isobaric reagents. This substitution maintains operational simplicity through automated labeling while eliminating cross-reactivity issues inherent in immunoassays, as the chemical labels provide specific mass spectral identification without biological interference
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 the sensitivity and specificity of steroid analysis, enabling accurate quantitation and multiplexing capabilities, reducing costs and analytical time while minimizing interference.
Implementation Method 1
Mass spectrometry is one technique that can provide rapid sample analysis
Implementation Method 2
one or more of the compounds of the general formula (IV) of the set of labels is isotopically enriched with two or more heavy atoms
Data Source
Figure 1
Figure 2
Figure 3A~3H
AI summary
In various aspects, the present teachings provide labeling reagents and sets of labeling reagents containing one or more heavy atom isotopes for the relative quantitation, absolute quantitation, or both, of hydroxylated compounds including, but not limited to, hydroxylated ring containing compounds, steroids and sterols. In various aspects, the present teachings also provide methods for the analysis hydroxylated compounds including, but not limited to, hydroxylated ring containing compounds, steroids and sterols my MS/MS methods, in particular using mass differential tags.