Surface-Modified Latex Particles for Agglutination Suppression
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Solution Overview
Problem
The latex agglutination method faces challenges with insufficient detection sensitivity when using small latex particles, and existing sensitizer polymers can cause nonspecific agglutination, leading to noise and storage issues due to bio-contamination risks.
Innovation Solution
A specific polymer with a high percentage of hydrophilic repeating units and a controlled amount of hydrophobic units is applied to latex particles, preventing agglutination by reducing nonspecific adsorption and improving storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If water-soluble polymer sensitizers are added to enhance detection sensitivity, then detection sensitivity is improved, but nonspecific agglutination occurs causing noise and storage instability
Solution Approach 1:
The invention changes the chemical parameters of the sensitizer by specifying a polymer with a particular molecular weight range (10,000-1,000,000) and specific compositional ratios (60-95% hydrophilic repeating units, 5-40% hydrophobic repeating units). This parameter optimization allows the sensitizer to enhance detection sensitivity while minimizing nonspecific agglutination and improving storage stability
Solution Approach 2:
The invention uses a composite polymer structure combining hydrophilic repeating units (such as polyalkylene glycol chains) and hydrophobic repeating units (such as carbonyl-containing groups). This composite structure enables the sensitizer to simultaneously improve detection sensitivity through hydrophilic interactions and prevent nonspecific agglutination through hydrophobic interactions, resolving the contradiction between sensitivity and stability
2Reliability
If biological substances are used as surface treatment agents to suppress agglutination, then agglutination suppression is improved, but bio-contamination risks arise
Solution Approach 1:
The invention replaces biological surface treatment agents with a synthetic polymer sensitizer that can be easily synthesized and disposed of. This synthetic alternative maintains the agglutination suppression function while eliminating bio-contamination risks associated with biological substances
Solution Approach 2:
The invention changes from biological materials to synthetic polymers by optimizing the molecular weight and compositional parameters of the polymer. This parameter optimization allows the synthetic polymer to achieve agglutination suppression equivalent to or better than biological substances without the associated bio-contamination risks
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 effectively suppresses latex particle agglutination during storage, enhancing detection sensitivity and reducing noise, while avoiding bio-contamination risks.
Implementation Method 1
agglutination of latex particles is suppressed... by treating surface of the latex particles with the polymer... containing more than 60% by mass and 99% by mass or less of hydrophilic repeating units (A)... and 1% by mass or more and less than 40% by mass of hydrophobic repeating units (B)
Data Source
AI summary
Provided are an additive and a surface treatment agent capable of suppressing agglutination of latex particles contained in a reagent for a latex agglutination reaction during storage of the reagent although a synthetic polymer is contained as an active component.An additive is to be added to latex particles used in a reagent for a latex agglutination reaction. The latex particles have not been subjected to blocking treatment. The additive includes a polymer containing more than 60% by mass and 99% by mass or less of hydrophilic repeating units (A) relative to all repeating units and 1% by mass or more and less than 40% by mass of hydrophobic repeating units (B) relative to all repeating units, and having a weight average molecular weight of 3,000 or more.