Polymer Particle Linker Design for Agglutination Stability
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Solution Overview
Problem
Existing particles for agglutination methods face challenges with non-specific adsorption and dispersion stability, leading to inadequate agglutination reactions in aqueous buffer solutions.
Innovation Solution
A particle with a polymer linker A having a reactive functional group for ligand bonding, specifically designed with an ester structure and a chain length of 18-24 bonds, optimized for minimal non-specific adsorption and enhanced dispersion stability, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a particle with polyglycidyl methacrylate surface coating is used to suppress non-specific adsorption, then non-specific adsorption is reduced, but dispersion stability becomes excessively excellent, preventing sufficient agglutination reaction
Solution Approach 1:
The patent changes the chemical parameters of the surface coating by introducing a specific polymer structure (polyethylene glycol with molecular weight 1000-10000) and controlling its concentration (0.1-10% by mass) to achieve the optimal balance between suppressing non-specific adsorption and maintaining dispersion stability for agglutination reaction
2Object-affected harmful factors
If biologically-derived substances are used to coat the particle surface, then non-specific adsorption is reduced, but physical properties vary by production lot and biological contamination concerns arise
Solution Approach 1:
The patent replaces biologically-derived coating substances with synthetic polymer materials (polyethylene glycol) that have consistent physical properties across production batches, eliminating the variability and contamination issues associated with biological substances while maintaining the desired non-specific adsorption suppression
3Object-affected harmful factors
If amphiphilic polymer compounds are used to coat the particle surface, then non-specific adsorption is reduced, but the particle may be liberated due to dilution and non-specific adsorption suppression is insufficient
Solution Approach 1:
The patent uses a composite coating system combining polyethylene glycol with specific molecular weight (1000-10000) and controlled concentration (0.1-10% by mass) to achieve both non-specific adsorption suppression and particle stability, preventing particle liberation upon dilution
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 particle achieves a balance between reduced non-specific adsorption and excellent dispersion stability, facilitating effective agglutination reactions and accurate target substance detection in vitro diagnostics.
Implementation Method 1
a particle including a polymer having a unit having a linker A in a side chain, wherein when both terminals of the linker A are represented by X1 and X2, the linker A has a reactive functional group for chemically bonding a ligand thereto
Implementation Method 2
one of X1 and X2 of the linker A includes an ester structure... shows a small non-specific adsorption
Data Source
AI summary
The present disclosure provides a particle showing a small non-specific adsorption, having a reactive functional group for chemically bonding a ligand thereto, and being suitable for an agglutination method; a particle for the agglutination method having a ligand chemically bonded to the particle; a reagent, a kit and a method for detecting a target substance, each for in vitro diagnosis, each of which contains the particle. The particle includes a polymer having a unit having a linker A in a side chain, wherein when both terminals of the linker A are represented by X1 and X2, the linker A has a reactive functional group for chemically bonding a ligand thereto in one of X1 and X2; one of X1 and X2 includes an ester structure; and a sum of bonds between atoms linearly connecting X1 and X2 is 18 to 24 and the X1 and X2 contain CH2 or CH.