Analyte Binding Turbidity Assay Using Particle Agglomerations
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Solution Overview
Problem
Current immunoassays face limitations in sensitivity and detection speed due to the lack of efficient methods for forming agglomerations of particles that enhance analyte detection.
Innovation Solution
The use of particles with specific ligands, such as antibodies and avidin or biotin, forming non-covalent bonds to create agglomerations that increase the affinity for analytes, thereby enhancing the sensitivity and speed of analyte detection in assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional immunoassay methods are used without forming particle agglomerations, then the assay procedure is simpler, but the sensitivity and detection speed are reduced
Solution Approach 1:
The patent merges multiple particles into agglomerations through ligand-mediated binding. Particles are functionalized with ligands (e.g., biotin, avidin) that cause them to self-assemble into larger agglomeratic structures when analyte is present. This merging of particles into agglomerations amplifies the detection signal, thereby improving sensitivity without requiring complex external instrumentation.
Solution Approach 2:
The patent applies preliminary action by pre-functionalizing particles with specific ligands before the assay is performed. The particles are prepared in advance with attached ligands (such as biotinylated antibodies or avidin-coated surfaces) that will subsequently bind to analyte-bound particles. This pre-preparation enables rapid agglomeration upon analyte addition, improving both sensitivity and detection speed.
2Productivity
If traditional immunoassay methods are used without forming particle agglomerations, then the assay protocol is less complex, but the detection speed is reduced
Solution Approach 1:
The formation of particle agglomerations merges multiple particle-analyte complexes into larger visible structures. This merging process accelerates detection because the agglomerations create stronger optical, magnetic, or electrical signals that can be detected more rapidly and at lower analyte concentrations compared to individual particles.
Solution Approach 2:
The patent utilizes parameter changes by modifying physical or chemical properties of the particle system. By changing parameters such as particle concentration, ligand density, or binding affinity constants, the system optimizes the rate and extent of agglomeration. These parameter adjustments enable faster detection kinetics while maintaining assay specificity.
3Measurement precision
If particles with high affinity ligands are used to form agglomerations, then the signal-to-concentration ratio is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs intermediary ligands (such as biotin and avidin) that mediate the binding between particles and analytes. These intermediary molecules serve as universal connectors with extremely high binding affinity (Kd in the pM range). By using these well-characterized intermediary binding pairs, the system achieves superior signal-to-concentration ratios while relying on commercially available reagents that simplify the manufacturing process.
Solution Approach 2:
The patent optimizes manufacturing by controlling key parameters such as ligand-to-particle ratio, binding buffer conditions, and incubation time. By carefully adjusting these parameters, the system achieves consistent particle functionalization and agglomeration behavior. This parameter control enables reproducible manufacturing of high-performance assay reagents despite the complexity of multi-component systems.
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 described method increases the sensitivity and speed of analyte detection by forming agglomerations that can detect smaller amounts of analytes faster compared to traditional methods, using particles with high affinity ligands like biotin and avidin, which improve the signal-to-concentration ratio.
Implementation Method 1
The use of particles with specific ligands, such as antibodies and avidin or biotin, forming non-covalent bonds to create agglomerations
Implementation Method 2
The second and third ligands can have an affinity constant of at least about 1×10^4 liters per mole
Implementation Method 3
measuring a predetermined parameter (e.g., turbidity, absorbance, fluorescence or radioactivity)
Implementation Method 4
measuring a predetermined parameter (e.g., turbidity, absorbance, fluorescence or radioactivity)
Data Source
AI summary
Assays, such as immunoassays, and related articles are disclosed.