C-Terminal Capture Substance for Immune Complex Transfer
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Solution Overview
Problem
Existing methods for detecting analytes in clinical specimens, such as cerebrospinal fluid, suffer from low accuracy due to non-specific binding of antibodies to contaminants and the cover glass, and require improvement in detection sensitivity.
Innovation Solution
A method using a capture substance that binds to the C-terminal region of a polypeptide analyte in an immune complex transfer (ICT) process, allowing for higher sensitivity detection by forming and transferring immune complexes between solid phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a CSF is dropped onto a cover glass to detect Aβ, then the detection method is simple, but contaminants are also immobilized on the cover glass causing non-specific binding of antibodies and reducing measurement accuracy
Solution Approach 1:
The patent introduces magnetic particles as an intermediary carrier to replace direct dropping onto cover glass. The magnetic particles selectively capture Aβ through antibody binding, then enable controlled transfer to observation substrates. This intermediary step prevents contaminant immobilization while maintaining operational simplicity.
Solution Approach 2:
The patent extracts Aβ from the complex CSF mixture by using magnetic particles functionalized with specific antibodies. The magnetic separation process removes Aβ along with magnetic particles from the liquid phase, leaving contaminants behind. This extraction eliminates the source of non-specific binding while preserving the target analyte.
2Reliability
If conventional detection methods are used to measure analyte in clinical specimen, then the measurement system can detect synthetic polypeptide, but detection sensitivity is insufficient when measuring analyte contained in clinical specimen
Solution Approach 1:
The patent combines multiple antibody binding steps on the same magnetic particle-bound Aβ complex. First antibodies capture Aβ, then second antibodies bind to the captured Aβ, creating a multi-antibody sandwich complex. This merging of multiple recognition events on a single target increases signal amplification and detection sensitivity while maintaining reliability.
Solution Approach 2:
The patent performs preliminary enrichment of Aβ by binding it to magnetic particles before the actual detection step. This pre-concentration step accumulates trace amounts of Aβ from the clinical specimen, increasing its effective concentration for subsequent detection and thereby improving sensitivity without sacrificing the reliability of the detection system.
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 method enables the accurate acquisition of information on the quantity or structure of a polypeptide analyte with enhanced sensitivity, reducing interference from contaminants and improving detection reliability.
Implementation Method 1
a capture substance that binds to a C-terminal region of the polypeptide
Implementation Method 2
bonding the capture substance in the complex to a first solid phase to immobilize the complex onto the first solid phase
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
PROBLEM TO BE SOLVED The problem to be solved is to provide a measure to acquire information on the quantity or the structure of a polypeptide that is an analyte with high accuracy. MEASURE TO SOLVE THE PROBLEM The problem is solved by using, in an immune complex transfer method in which a capture substance that binds to the polypeptide that is an analyte, a first solid phase and a second solid phase, a capture substance binding to C-terminal region of the polypeptide as a capture substance binding to at least one of the fist solid phase and second solid phase.