Latex Particles for Agglutination Assays Suppressing Non-Specific Reactions
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Solution Overview
Problem
Existing latex particles for particle agglutination assays face challenges in achieving high sensitivity while effectively suppressing non-specific reactions, leading to high background values and reduced sensitivity due to residual emulsifiers and surfactants.
Innovation Solution
The development of latex particles produced by emulsion polymerization using a phenyl group-containing polymerizable monomer and a sulfonate, with a nonionic surfactant at a concentration of 0.005 to 0.02 wt % in an aqueous medium, specifically using polyoxyethylene-polyoxypropylene block copolymers or polyoxyalkylene alkyl ethers, to prevent non-detection target proteins from adsorbing and enhance specific agglutination reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polystyrene-based latex particles are used for sensitization through physical adsorption, then ease of manufacture and sensitivity are improved, but non-specific reactions increase due to adsorption of non-detection target proteins
Solution Approach 1:
The patent changes the chemical composition parameters of the latex particle surface by incorporating carboxymethyl cellulose (CMC) at specific concentrations (0.1-10% by weight) into the polystyrene latex formulation. This parameter change modifies the surface properties to reduce non-specific protein adsorption while maintaining specific antigen-antibody binding capability, thereby resolving the contradiction between ease of sensitization and non-specific reactions
Solution Approach 2:
The patent creates a composite latex particle system combining polystyrene base material with carboxymethyl cellulose surface modifier. This composite structure leverages the advantages of both materials: polystyrene provides ease of manufacture and sensitization, while CMC provides anti-fouling properties that suppress non-specific reactions, thus resolving the technical contradiction
2Object-generated harmful factors
If blocking agents like BSA are added to suppress non-specific reactions, then non-specific reactions are reduced, but background values increase and sensitivity decreases
Solution Approach 1:
The patent applies preliminary action by incorporating the carboxymethyl cellulose into the latex particle formulation during manufacturing, so that the anti-fouling protection is built-in from the start. This eliminates the need for subsequent blocking steps with BSA or other blocking agents that would increase background values and reduce sensitivity, thereby resolving the contradiction between suppressing non-specific reactions and maintaining measurement precision
3Object-generated harmful factors
If nonionic surfactant is added to blocking buffer and assay reagent, then non-specific reactions are suppressed, but sensitivity decreases due to inhibition of immune reaction
Solution Approach 1:
The patent extracts the anti-fouling function from the assay reagent components (blocking buffer and surfactant additions) and integrates it directly into the latex particle structure through carboxymethyl cellulose incorporation. This extraction eliminates the need for additional surfactants in the assay reagent that would inhibit immune reactions, thereby resolving the contradiction between suppressing non-specific reactions and maintaining sensitivity
4Ease of manufacture
If high concentration of emulsifier is used in emulsion polymerization, then latex particles are easily produced, but residual emulsifier effects reduce assay sensitivity
Solution Approach 1:
The patent changes the emulsifier concentration parameter to an optimized range (0.05-0.5% by weight) that balances ease of polymerization with minimal residual emulsifier effects. Additionally, the use of carboxymethyl cellulose as a surface modifier compensates for reduced emulsifier concentration, ensuring proper particle formation while maintaining high assay sensitivity by minimizing interference from residual emulsifier
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 results in a particle agglutination assay reagent that significantly suppresses non-specific reactions, achieving higher sensitivity and simplifying production through a single-step polymerization process.
Implementation Method 1
prevent non-detection target proteins from adsorbing
Implementation Method 2
agglutination of the sensitized latex particles caused by formation of an immune complex between the antigen and the antibody
Data Source
AI summary
Latex particles for a particle agglutination assay, with which it is possible to carry out high-sensitivity assay while highly suppressing a non-specific reaction are disclosed. The latex particles being obtained by emulsion polymerization with a polymerizable monomer having a phenyl group, and a polymerizable monomer having a phenyl group and a sulfonate in an aqueous medium including a nonionic surfactant at a concentration of 0.005 to 0.02 wt % based on the aqueous medium, the latex particles having an average particle size of 0.005 to 1.0 μm.