Modular MS Reagent for Sensitive Low-Abundance Analyte Detection
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Solution Overview
Problem
Existing mass spectrometry methods face challenges in sensitivity, particularly for analyzing low-abundance analytes from complex biological matrices, with current derivatization reagents often causing structural isomers, non-optimal ionization, and interference with chromatographic separation.
Innovation Solution
A novel reagent with a modular design, comprising a reactive group, branched linker, neutral loss unit, and charged unit, allowing for sensitive detection of analytes by forming a covalent adduct that enhances mass spectrometric analysis without interfering with the workflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If derivatization reagents are used to improve sensitivity of MS analysis, then detection sensitivity is improved, but structural isomers are generated due to coupling chemistry
Solution Approach 1:
The derivatization reagent is divided into functionally independent units: a reactive group for covalent attachment to the analyte, a linker arm providing spatial separation, and a charged unit for ionization. This segmentation prevents complex coupling chemistry that generates structural isomers while maintaining high detection sensitivity through the modular design.
2Measurement precision
If derivatization reagents with charged units are used to enhance ionization efficiency, then ionization efficiency is improved, but chromatographic separation is negatively influenced
Solution Approach 1:
A linker arm acts as an intermediary component between the reactive group and the charged unit. This linker provides sufficient spatial separation to prevent the charged unit from interfering with chromatographic separation processes while still allowing the derivatized analyte to achieve optimal ionization efficiency in the mass spectrometer.
3Measurement precision
If known derivatization reagents are used to increase sensitivity, then sensitivity is improved, but labelling efficiencies are insufficient
Solution Approach 1:
The reactive group in the derivatization reagent is specifically designed with optimized chemical properties including reactivity parameters, steric accessibility, and compatibility with common analyte functional groups. These parameter optimizations enable high labelling efficiencies while maintaining the sensitivity enhancements provided by the charged unit for mass spectrometric detection.
4Measurement precision
If derivatization reagents are used for low-abundance analytes, then detection capability is improved, but the reagent structure interferes with MS measurement workflow
Solution Approach 1:
The charged unit is extracted as a separate, permanently charged moiety attached through a linker arm, allowing it to function independently for ionization without creating complex fragmentation pathways. This extraction simplifies the MS measurement workflow by providing clean, predictable ionization behavior for low-abundance analytes without interfering with standard mass spectrometric procedures.
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 reagent improves sensitivity and specificity in mass spectrometric analysis, enabling efficient detection of steroids, proteins, and other analytes from biological samples, particularly in high-throughput settings.
Implementation Method 1
X is a reactive group capable of forming a covalent bond with an analyte molecule
Implementation Method 2
Z is a charged unit comprising at least one permanently charged moiety
Data Source
AI summary
The present invention relates to reagents which are suitable to be used in mass spectrometry as well as methods of mass spectrometric determination of analyte molecules using said reagents.