Thyroxine Immunoassay Base Plate Reducing Temperature Dependency
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Solution Overview
Problem
Enzymatic immunoassays for thyroxine are temperature-dependent, requiring strict temperature management, which complicates the process and increases signal variability due to temperature changes.
Innovation Solution
A base plate with a conjugate of thyroxine or its derivative immobilized with albumin at a specific ratio (8:12) is used, along with anti-thyroxine antibody-labeled fluorescent particles, to facilitate competitive binding and reduce signal change rates through fluorescence measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If enzymatic immunoassay method is used for thyroxine measurement, then simple operation is achieved, but temperature management complexity increases and signal variability due to temperature changes occurs
Solution Approach 1:
The patent replaces the enzymatic reaction system with a fluorescent labeling system. Instead of using enzymes that require strict temperature control for catalytic activity, the invention uses fluorescently labeled anti-thyroxine antibodies that bind directly to thyroxine antigens. This substitution eliminates the need for temperature-dependent enzymatic reactions while maintaining immunoassay functionality, thus resolving the contradiction between operational simplicity and temperature management complexity
Solution Approach 2:
The patent changes the detection parameter from enzymatic activity (which is temperature-dependent) to fluorescence intensity (which is not significantly affected by temperature variations). By using fluorescently labeled antibodies and measuring fluorescence signal instead of enzymatic reaction products, the system achieves temperature independence while preserving ease of operation
2Ease of operation
If enzymatic immunoassay method is used for thyroxine measurement, then simple operation is achieved, but signal variability due to temperature changes increases
Solution Approach 1:
The patent replaces the temperature-sensitive enzymatic reaction system with a temperature-insensitive fluorescent labeling system. Fluorescently labeled antibodies maintain their binding properties across a wider temperature range, eliminating signal variability caused by temperature fluctuations while keeping the assay operationally simple
Solution Approach 2:
The patent uses fluorescently labeled antibodies as disposable labeling reagents that do not require the same level of environmental control as enzymatic systems. These labeled antibodies provide stable signals without the need for strict temperature management, improving measurement precision
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 provides a convenient and sensitive thyroxine immunoassay with reduced temperature dependency, maintaining assay performance and accuracy.
Implementation Method 1
anti-thyroxine antibody-labeled fluorescent particles...measuring the fluorescence based on the anti-thyroxine antibody labeled fluorescent particles bound to the base plate
Implementation Method 2
utilizing the effect of electric field reinforcement by plasmon resonance so as to increase the sensitivity of detection...generation of surface plasmon at the metal layer. Through the electric field reinforcing action brought by the generation of such surface plasmon, fluorescence is reinforced
Data Source
Figure 1
AI summary
Provided are a base plate and a method for thyroxine immunoassay, which are capable of decreasing the signal change rate caused by temperature change in a high-sensitivity immunoassay method for thyroxine. A base plate for thyroxine immunoassay which has a conjugate of thyroxine or a derivative thereof and albumin immobilized thereon, and in which the ratio of the molecule number of thyroxine or a derivative thereof to the molecule number of albumin in the immobilized conjugate, is disclosed.