Modular Derivatization Reagent for Mass Spectrometry
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Solution Overview
Problem
Current derivatization reagents for mass spectrometry suffer from low sensitivity, especially in analyzing low-abundance analytes from complex biological matrices, due to insufficient labeling efficiencies, generation of structural isomers, non-optimal ionization efficiencies, and adverse effects on chromatographic separation and fragmentation behavior.
Innovation Solution
Development of a novel reagent with a modular design, comprising a reactive group for covalent bonding, a neutral loss unit, and a charged unit, allowing for sensitive detection of analytes like steroids and proteins, optimized for specific analytes and workflows in mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known derivatization reagents (Cookson-type, Amplifex, Girard reagents) are used to improve sensitivity of MS analysis, then sensitivity for low-abundance analytes is enhanced, but labeling efficiency remains insufficient and structural isomers are generated
Solution Approach 1:
The derivatization reagent is divided into three distinct functional units: a reactive unit (X) for covalent bonding to the analyte, a charged unit (Z) for optimal ionization in MS, and a neutral loss unit (Y) for improved fragmentation behavior. These units are connected via linkers (L1, L2) to ensure each unit performs its specific function without interfering with others, thereby achieving high labeling efficiency and sensitivity simultaneously.
Solution Approach 2:
The reagent combines multiple functional moieties (reactive group, charged group, neutral loss group) into a single composite molecular structure. This composite design allows the reagent to simultaneously provide covalent binding capability, optimal ionization efficiency, and controlled fragmentation, resolving the contradiction between sensitivity enhancement and labeling precision.
2Measurement precision
If known derivatization reagents are used to enhance sensitivity, then detection capability is improved, but generation of structural isomers occurs which complicates analysis
Solution Approach 1:
The reactive unit X is designed with specific chemical properties that enable selective and regioselective covalent bonding to the analyte at a specific site. This localized reactivity ensures that derivatization occurs at a single preferred position, minimizing or eliminating the formation of structural isomers while maintaining high detection capability.
3Measurement precision
If known derivatization reagents are used to improve sensitivity, then signal intensity is enhanced, but ionization efficiency and fragmentation behavior become non-optimal
Solution Approach 1:
The charged unit Z is specifically designed with adjustable parameters including charge type (positive or negative), charge location, and chemical composition. These parameters can be optimized to match the specific requirements of the mass spectrometer and the analyte being analyzed, ensuring optimal ionization efficiency and reliable fragmentation behavior while maintaining high signal intensity.
4Measurement precision
If derivatization reagents with larger structural units are used, then sensitivity is improved, but workflow efficiency and chromatographic separation are adversely affected
Solution Approach 1:
The linkers L1 and L2 connecting the functional units are designed with appropriate flexibility and length to optimize the spatial arrangement of the reagent-analyte complex. This dynamic structural design ensures that the derivatized analyte maintains optimal conformation for MS detection while preserving good chromatographic separation properties and workflow efficiency.
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
Enhances the sensitivity and efficiency of mass spectrometric analysis by improving labeling efficiency, reducing structural isomer formation, and optimizing ionization and fragmentation behavior, enabling precise detection of analytes in complex biological samples.
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.