MPC Copolymer Inhibitor for Accurate Immunoassay Measurement

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Solution Overview

Problem

Existing methods for inhibiting non-specific reactions in biochemical measurements, such as those caused by heterophile antibodies or rheumatoid factors, are inadequate, leading to measurement errors and reduced accuracy.

Innovation Solution

A copolymer comprising a constitutional unit derived from 2-methacryloyloxyethyl phosphorylcholine is used to inhibit non-specific reactions by mixing it with the biological sample, maintaining measurement sensitivity and accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If anti-human IgM antibody or other conventional non-specific reaction inhibitors are used, then non-specific reactions caused by heterophile antibodies or rheumatoid factors are inhibited, but certain non-specific reactions cannot be inhibited, leading to measurement errors

Engineering Contradiction:

Improveinhibition of non-specific reactionsVSAvoidmeasurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent changes the chemical structure parameter of the non-specific reaction inhibitor from conventional antibodies (anti-human IgM, anti-human IgA, anti-human IgG) to a copolymer with a specific constitutional unit derived from 2-methacryloyloxyethyl phosphorylcholine. This structural parameter change enables the inhibitor to effectively block non-specific reactions that were previously resistant to conventional inhibitors, thereby improving both reliability and measurement precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a copolymer composed of multiple constitutional units, including the key unit from 2-methacryloyloxyethyl phosphorylcholine and other complementary units. This composite material structure combines the advantages of different polymer components to achieve broad-spectrum inhibition of various non-specific reactions, resolving the limitation of single-type conventional inhibitors

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If high-molecular-weight polymers are added to stabilize dispersion or inhibit non-specific reactions, then measurement stability improves, but measurement sensitivity may be reduced

Engineering Contradiction:

Improvedispersion stabilityVSAvoidmeasurement sensitivity

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent optimizes the molecular weight parameter of the copolymer to a specific range that balances dispersion stability and measurement sensitivity. The copolymer's molecular weight is controlled to be sufficient for stabilizing latex particle dispersion but not so high as to interfere with the antigen-antibody reaction, thereby resolving the contradiction between stability and sensitivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The copolymer exhibits different functional properties at different molecular scales: at the macro level, it provides steric stabilization to prevent latex aggregation; at the molecular level, it allows sufficient penetration and binding between antigens and antibodies. This local quality differentiation enables simultaneous achievement of dispersion stability and measurement sensitivity

Inventive Principle:

Principle #3Local quality

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 copolymer effectively inhibits non-specific reactions, improving measurement accuracy without reducing sensitivity, and can be used in biochemical assays like latex turbidimetric immunoassays and ELISA methods.

Implementation Method 1

a copolymer comprising a constitutional unit A derived from 2-methacryloyloxyethyl phosphorylcholine and exhibiting the following physical property X... when measuring a measurement target substance contained in a biological sample by mixing the copolymer with the biological sample

Methodology Applied

Scientific EffectNon-specific reaction inhibition:

Data Source

PatentUS20260063631A1Non-specific reaction inhibitor, method for using non-specific reaction inhibitor, method for inhibiting non-specific reaction, biochemical measurement reagent, specimen pretreatment solution, and biochemical measurement reagent kit

Publication Date: 2026.03.05 SEKISUI MEDICAL CO LTD

AI summary

A non-specific reaction inhibitor, which is a copolymer comprising a constitutional unit A derived from 2-methacryloyloxyethyl phosphorylcholine and exhibiting a specific physical property X measured by Fourier transform infrared spectroscopy according to an attenuated total reflection method (ATR method), the non-specific reaction inhibitor being used in a use application of inhibiting a non-specific reaction when measuring an antibody or an antigen contained in a biological sample by mixing the copolymer with the biological sample.