Mass Tag Detection Reagents for Sensitive Multiplexed IA-LC-MS/MS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current immunoassay methods are limited by the availability of high-quality custom reagents, which take time to generate and have lot-to-lot variability, and IA-LC-MS/MS methods lack signal amplification, resulting in insufficient sensitivity and difficulty in multiplexing without losing assay sensitivity.
Innovation Solution
The method involves using detection reagents with a cleavable linker and multiple tags to amplify the MS signal by detecting tagged polypeptides instead of heterogeneous peptide fragments, enabling sensitivity down to ~pg/mL levels and allowing multiplexed assays without sensitivity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If IA-LC-MS/MS methods measure analytes directly without signal amplification, then the assay is simple, but the sensitivity is insufficient and signal-to-noise ratio is low
Solution Approach 1:
The patent introduces a mass tag as an intermediary substance that binds to the analyte and provides a detectable mass signal. The mass tag acts as a mediator between the analyte and the mass spectrometer detection system, amplifying the signal without requiring complex signal amplification enzymes or multiple assay steps. This resolves the contradiction by enabling high sensitivity through a simple direct binding approach.
Solution Approach 2:
The patent changes the detection parameter from measuring the analyte directly to measuring the mass tag bound to the analyte. By detecting the mass tag's characteristic mass signal instead of the analyte's native signal, the method achieves higher sensitivity and signal-to-noise ratio. This parameter change allows sensitivity improvement without proportionally increasing assay complexity.
2Reliability
If custom reagents are generated for each polypeptide analyte, then the assay specificity is high, but the time required and lot-to-lot variability increase
Solution Approach 1:
The mass tag serves as a universal detection reagent that can bind to multiple different polypeptide analytes through different capture antibodies. Instead of generating custom reagents for each analyte, the same mass tag system can be used across multiple analytes by simply changing the capture antibody. This universality eliminates reagent generation time and reduces lot-to-lot variability while maintaining assay specificity through antibody-analyte binding.
Solution Approach 2:
The patent uses a standardized mass tag design that can be replicated and used across different assays. The mass tag serves as a copyable detection element that replaces the need to create unique reagents for each analyte. This copying approach ensures consistency and reliability while eliminating the time-consuming custom reagent generation process.
3Adaptability or versatility
If multiple analytes are detected using traditional methods, then the multiplexing capability is achieved, but the assay sensitivity is lost
Solution Approach 1:
The patent segments the detection signal by using analyte-specific capture antibodies that each bind to a different polypeptide analyte, while all capture antibodies bind the same universal mass tag. This segmentation allows multiple analytes to be detected simultaneously (multiplexing) while maintaining sensitivity, because each analyte's signal is captured and amplified by its specific antibody-mass tag complex. The mass spectrometer can then resolve and quantify each analyte based on the unique mass tag signals.
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 achieves high signal-to-noise ratios and enables sensitive detection and quantification of multiple analytes, improving assay sensitivity and robustness through signal amplification and multiplexing.
Implementation Method 1
a) affinity enrichment by contacting the sample with a capture reagent to generate a captured analyte complex, wherein the capture reagent comprises a binding reagent that binds the analyte
Implementation Method 2
b) contacting the captured analyte complex with a detection reagent, wherein the detection reagent binds the captured analyte complex
Implementation Method 3
d) subjecting the sample from step c) under conditions to cleave the linker to release the tag
Implementation Method 4
e) analyzing the sample from step d) for presence of the released tag by mass spectroscopy
Data Source
AI summary
Provided herein are detection reagents and assays for detecting and/or quantitating an analyte in a sample by liquid chromatography/mass spectrometry (LS/MS). In some embodiments, the detection reagent is a compound having the formula wherein: B is a base detection moiety that binds the analyte, L is a cleavable linker, T is a tag suitable for mass spectroscopy, n is an integer greater than or equal to 1, and p is an integer greater than or equal to 1.