Polymer Element Tags for Multiplexed ICP-MS Biomarker Detection
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Solution Overview
Problem
Current protein quantitation methods in proteomics and drug discovery face limitations in sensitivity, selectivity, dynamic range, and the ability to simultaneously determine multiple protein concentrations accurately, particularly in biological samples, due to the lack of advanced multiplexing capabilities.
Innovation Solution
Development of a new class of polymer-based element tags optimized for Inductively Coupled Plasma Mass Spectrometry (ICP-MS) that allow for the simultaneous detection of multiple biomarkers, utilizing metal-binding pendant groups capable of binding heavy metals and their isotopes, enabling absolute quantification and high multiplexing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional protein quantitation methods (Bradford, Lowry, UV spectroscopy, ELISA) are used, then the assays are simple to perform, but they lack sensitivity, selectivity, dynamic range, and multiplexing capability
Solution Approach 1:
The patent introduces polymer-based element tags containing metal atoms (such as lanthanides) as intermediary components that bind to target proteins. These tags serve as mediators between the protein analyte and the ICP-MS detection system, enabling highly sensitive and selective detection. The metal atoms in the tags do not naturally occur in biological samples, providing unique detection signatures that enhance selectivity while the polymer backbone provides stability and binding capability.
Solution Approach 2:
The patent changes the detection parameter from traditional optical or electrochemical signals to elemental composition analysis via ICP-MS. By measuring the presence and quantity of specific metal atoms (such as europium, terbium, dysprosium) introduced through the element tags, the system achieves superior sensitivity and dynamic range. The use of multiple different metal atoms enables simultaneous multiplexed detection of multiple proteins in a single assay.
2Productivity
If traditional methods are used, then the procedures are well-established, but they cannot simultaneously determine multiple protein concentrations with high accuracy
Solution Approach 1:
The patent creates a universal detection platform where a single ICP-MS instrument can detect multiple different metal atoms simultaneously. Each protein target is tagged with a polymer containing a specific metal atom, and the ICP-MS system can quantify multiple elements in a single measurement, enabling high-throughput multiplexed protein quantitation. This universal approach replaces the need for multiple separate assays with one integrated system.
Solution Approach 2:
The patent segments the detection system by assigning different metal atom signatures to different protein targets. Each element tag contains a specific metal (such as europium for one protein, terbium for another, dysprosium for a third), allowing the simultaneous detection and quantification of multiple proteins through their unique elemental signatures in a single ICP-MS run.
3Reliability
If ICP-MS linked immunoassays with element tags are implemented, then sensitivity and multiplexing are dramatically improved, but the device complexity and method sophistication increase
Solution Approach 1:
The element tags are designed to be self-contained units where the polymer backbone automatically provides stability, solubility, and binding functionality, while the metal atoms provide the detection signal. The tags do not require additional processing or preparation steps beyond simple incubation with the sample, allowing the complex ICP-MS detection capability to be accessed through a relatively simple assay procedure.
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 polymer-based element tags significantly enhance the sensitivity and multiplexing capacity of bio-assays, allowing for the detection of multiple biomarkers with high accuracy and precision, independent of the sample matrix, and provide a quantitative high-throughput analog of Western blotting.
Implementation Method 1
metal-binding pendant groups capable of binding heavy metals and their isotopes
Implementation Method 2
mass spectrometric atomic spectroscopy, such as inductively coupled mass spectrometry, which probes the mass of atoms
Data Source
AI summary
Element tags based on novel metal-polymer conjugates are provided for elemental analysis of analytes, including ICP-MS. A polymer backbone is functionalized to irreversibly bind metals that are selected prior to use by the user. The polymer is further functionalized to attach a linker which allows for attachment to antibodies or other affinity reagents. The polymer format allows attachment of many copies of a given isotope, which linearly improves sensitivity. The metal-polymer conjugate tags enable multiplexed assay in two formats: bulk assay, where the average biomarker distribution in the sample is diagnostic, and single cell format to distinguish a rare (for example a diseased) cell in a complex sample (for example, blood).