KL-6 Immunoassay Reagent pH Control for Rheumatoid Factor Interference
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Solution Overview
Problem
Existing KL-6 measurement assays face challenges with nonspecific reactions due to rheumatoid factor and heterophile antibodies, which are not adequately inhibited by current methods, leading to inaccurate results.
Innovation Solution
A KL-6 immunoassay reagent comprising a solution at pH 4.0 to 5.5 with an animal-derived immunoglobulin that reacts with rheumatoid factor and an insoluble carrier with immobilized anti-KL-6 antibodies, specifically using latex particles, to measure the agglutination change in absorbance, effectively inhibiting nonspecific reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If latex immunoagglutination assay is used for KL-6 measurement, then rapid and easy testing of large number of samples is achieved, but nonspecific reactions occur due to interference from rheumatoid factor and heterophile antibodies
Solution Approach 1:
The patent introduces an insoluble carrier (such as latex particles) as an intermediary substance to which anti-KL-6 antibodies are immobilized. This carrier mediates the agglutination reaction between KL-6 and antibodies, enabling rapid visual detection while the controlled immobilization reduces nonspecific binding of rheumatoid factor and heterophile antibodies, thus maintaining both speed and accuracy
Solution Approach 2:
The patent optimizes specific parameters including the pH of the reaction buffer (adjusted to specific ranges to minimize nonspecific binding), the concentration of blocking agents (such as BSA or gelatin), and the ratio of antibody to carrier particles. These parameter adjustments reduce interference from rheumatoid factor while preserving the sensitivity and speed of the immunoagglutination assay
2Reliability
If methods using antibodies that bind to rheumatoid factor are used to inhibit interference, then nonspecific reactions are reduced, but measurement precision of KL-6 is compromised
Solution Approach 1:
The patent extracts and removes the Fc portion of antibodies through proteolytic digestion, creating F(ab')2 fragments that retain antigen-binding capability but lack the Fc region that binds rheumatoid factor. This extraction of the problematic portion eliminates nonspecific reactions while preserving specific KL-6 detection precision
Solution Approach 2:
The patent segments the antibody molecule into functional parts by using F(ab')2 fragments, separating the antigen-binding function from the Fc portion that causes nonspecific binding. This segmentation allows the beneficial specific binding to KL-6 to be retained while eliminating the harmful rheumatoid factor interaction
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 allows for accurate and rapid measurement of KL-6 in samples containing rheumatoid factor and other nonspecific substances, reducing nonspecific reactions and providing reliable results within the 85% to 115% accuracy range of standard measurements.
Implementation Method 1
an animal-derived immunoglobulin that reacts with rheumatoid factor
Implementation Method 2
an insoluble carrier on which an anti-KL-6 antibody is immobilized... measuring the change in absorbance accompanying the agglutination of the insoluble carrier due to the immune reaction between KL-6 in the sample and the anti-KL-6 antibody
Implementation Method 3
measuring the change in absorbance accompanying the agglutination of the insoluble carrier
Data Source
AI summary
The present invention aims to provide an assay reagent and an assay for accurately measuring KL-6, in particular, an assay reagent and an assay for accurately measuring KL-6 in samples containing a rheumatoid factor and/or a nonspecific substance other than the rheumatoid factor. KL-6 in samples that contain a rheumatoid factor and/or a nonspecific substance other than the rheumatoid factor can be accurately measured using an immunoassay reagent comprising a solution at a pH of 4.0 to 5.5 containing a rheumatoid factor interference inhibitor and a solution of an insoluble carrier on which anti-KL-6 antibodies are immobilized.