Charged Mass Labeling for Rare Molecule Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mass label technologies for rare molecule detection in mass spectrometry face challenges such as low ionization efficiencies, peptide exchange during analysis, and suppression of signal intensity due to chemical reagents, leading to inefficient detection and false results.
Innovation Solution
Development of charged mass label compositions with a reversible binding unit and a pre-charged mass label unit, including a charge unit like quaternary ammonium or pyridinium groups, which are designed for high ionization efficiency and predictable fragmentation, allowing for accurate detection of rare molecules by mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mass labels (peptides) are used for rare molecule detection, then the detection approach is simple, but ionization efficiency is low and signal intensity is suppressed
Solution Approach 1:
The patent changes the chemical parameters of the mass label by introducing charged groups (quaternary ammonium, pyridinium, imidazolium) to replace neutral peptides. This parameter change fundamentally alters the ionization behavior, enabling high ionization efficiency and strong signal intensity in mass spectrometry while maintaining the rare molecule detection capability.
Solution Approach 2:
The patent creates a composite mass label structure combining a charged group (for high ionization efficiency) with a rare molecule-specific binding unit (for target recognition). This composite design integrates the advantages of charged compounds (high ionization) and peptide-based affinity reagents (specific binding), resolving the contradiction between detection reliability and ionization efficiency.
2Reliability
If peptides are used as mass labels, then they can bind to rare molecules, but peptide exchange occurs during mass spectrometry analysis
Solution Approach 1:
The patent changes the chemical stability parameter by replacing peptide bonds with more stable charged group structures (quaternary ammonium, pyridinium). These charged groups form stable interactions with the rare molecules while being resistant to exchange reactions during mass spectrometry analysis, thus maintaining both binding stability and compositional integrity.
3Productivity
If chemical reagents are used to release mass labels from affinity reagents, then the mass labels can be detected, but signal intensity is suppressed
Solution Approach 1:
The patent changes the chemical properties of the mass label by introducing charged groups that are inherently detectable by mass spectrometry without requiring chemical modification or release reagents. This parameter change eliminates the signal suppression problem caused by reagents while maintaining efficient mass label release and detection.
4Productivity
If mass spectrometry is used for rare event detection, then detection speed is fast, but background interference from matrix components causes false results
Solution Approach 1:
The patent applies local quality by making the mass label highly detectable through charged groups that produce strong, characteristic signals in mass spectrometry. This localized enhancement of detection capability at the mass label site improves the signal-to-background ratio, enabling fast and accurate rare event detection even in complex matrices.
Solution Approach 2:
The patent uses mass-to-charge ratio as the detectable property (analogous to color in optical detection). The charged mass labels produce distinct and predictable mass-to-charge values that are easily distinguishable from background interference, enabling precise detection of rare molecules with high signal-to-background ratio.
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 charged mass label compositions enable efficient and reliable detection of rare molecules by ensuring high ionization efficiency and analytically separating the mass label from background noise, improving the accuracy and sensitivity of mass spectrometry analysis.
Implementation Method 1
the mass label includes a charge unit (e.g., a pre-charged (ionic functional group) such as a quaternary ammonium (quaternary amine) group, or an analogous sulfonium or phosphonium cation, or pyridinium or imidzazolium). This charge unit is ionic and so is readily observed in the MS as a gas-phase ion.
Implementation Method 2
The reversible binding of the label binding unit allows for easy and reliable cleavability of the MS label from the affinity agent.
Data Source
AI summary
The invention generally relates to charged mass label compositions and methods of use thereof for detecting a target analyte in a sample. In certain aspects, the invention provides a charged mass label composition including an affinity reagent, and a mass label precursor bound to the affinity reagent. The mass label precursor includes a label binding unit and a mass label. The label binding unit reversibly binds the mass label to the affinity reagent. The mass label includes a charge unit and a mass label unit having a pre-defined mass-to-charge-value in a mass spectrum.