Flow-Based Antibody Neutralizing Potential Assessment
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Solution Overview
Problem
Current methods for assessing the neutralizing potential of antibodies in biological samples are limited by their inability to accurately measure the strength and quality of antibody-antigen interactions in complex biological media, leading to a lack of standardization and reproducibility.
Innovation Solution
A method involving a flow-based analytical device with an antigen of interest, where the complex biological sample is introduced to allow antibody-antigen interactions, and the association-rate binding constant (ka) and dissociation-rate binding constant (kd) are determined to assess the neutralizing potential of antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SPR or other evanescent wave-based techniques are used to analyze antibody concentrations, then antibody detection is possible, but the analysis requires prior treatment of the sample (heat treatment, dithiothreitol, dialysis, concentration, and/or purification) which removes other soluble components originally present in the sample
Solution Approach 1:
The invention extracts only the essential measurement function (antibody-antigen interaction detection) from the complex SPR system by using a simpler optical detection method that does not require evanescent wave technology, thereby eliminating the need for extensive sample preparation steps while maintaining measurement capability
Solution Approach 2:
The invention introduces a solid-phase antigen coating as an intermediary that captures antibodies directly from complex biological samples without requiring prior sample treatment, enabling direct measurement of antibody interactions in native biological media
2Measurement precision
If prior sample treatment (heat treatment, dithiothreitol, dialysis, concentration, and/or purification) is applied to make samples suitable for SPR analysis, then antibody analysis becomes possible, but the samples are no longer complex biological samples containing all soluble components originally present
Solution Approach 1:
The invention enables the complex biological sample to serve itself by directly interacting with the solid-phase antigen without requiring external preprocessing steps, thereby preserving the native biological context and all soluble components while enabling accurate antibody interaction measurement
3Quantity of substance
If current antibody measurement methods are used, then antibody titres can be detected, but essentially no information about the strength or other qualities of the antibody-antigen interaction is provided
Solution Approach 1:
The invention transitions from static endpoint antibody titre measurements to dynamic real-time measurement of antibody-antigen interaction kinetics, capturing the temporal evolution of binding events to provide comprehensive information about interaction strength, affinity, and quality
Solution Approach 2:
The invention replaces the mechanical/chemical endpoint detection methods with optical detection of refractive index changes, enabling real-time monitoring of binding dynamics and providing rich kinetic data that reveals interaction qualities beyond simple quantity measurement
4Adaptability or versatility
If different preparative and analytical conditions are used for assays against different pathogens, then pathogen-specific antibody measurement is possible, but a significant lack of standardization occurs
Solution Approach 1:
The invention creates a universal solid-phase immunoassay platform that can measure antibodies against any pathogen by simply changing the antigen coating, maintaining consistent measurement principles and data interpretation across different pathogen targets, thereby achieving both versatility and standardization
Solution Approach 2:
The invention allows easy modification of the antigen parameter (coating different pathogens on the solid phase) while maintaining all other assay conditions constant, enabling pathogen-specific measurement without compromising standardization of the measurement process itself
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 method provides a standardized and reproducible assessment of the neutralizing capacity of antibodies by measuring the kinetic parameters of antibody-antigen interactions, which correlates with the functional immune status of the subject.
Implementation Method 1
allowing antibodies present in the complex biological sample to interact with the antigen of interest, and determining the association-rate binding constant ka of the antibody-antigen interaction and/or the dissociation-rate binding constant kd of the antibody-antigen interaction
Data Source
AI summary
A method for assessing the neutralising potential of antibodies in a complex biological sample, the method comprising contacting the complex biological sample with a flow-based analytical device, the analytical device being provided with an antigen of interest, allowing antibodies present in the complex biological sample to interact with the antigen of interest, and determining the association-rate binding constant ka of the antibody-antigen interaction and/or the dissociation-rate binding constant ka of the anti-body-antigen interaction.