Multi-coated Test Surface for IgG and C1q Immune Complex Detection
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Solution Overview
Problem
Current methods for detecting food allergens and immune reactivity are limited, as they primarily focus on water-soluble proteins and do not adequately characterize antibody binding to a broader range of antigenic molecules or complement components like C1q, which are crucial for understanding antigen specificity and immune complex formation.
Innovation Solution
A method involving the extraction of various antigenic molecules using distinct physical/chemical methods, creating a multi-coated test surface with alkali-soluble, alcohol-soluble, water-soluble proteins, polysaccharides, glycolipids, and glycoproteins, and using species-specific antibodies tagged with detectable markers to characterize IgG, IgA, and C1q binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only water-soluble proteins are tested, then the assay is simple and quick, but the detection coverage is limited and cannot identify antibodies against other antigenic molecules
Solution Approach 1:
The patent segments the antigen extraction process into five distinct extraction methods (water-soluble, alcohol-soluble, alkali-soluble, glycolipid, polysaccharide) to isolate different classes of antigenic molecules. Each extraction targets specific molecular properties, allowing comprehensive coverage of diverse food antigens while maintaining systematic organization of the complex assay
Solution Approach 2:
The patent creates a universal test surface that can simultaneously detect antibodies against multiple classes of antigens (proteins, glycolipids, polysaccharides) from various food sources. The multi-coated test surface serves multiple functions: detecting IgG, IgA, and C1q binding across diverse antigen types in a single assay, eliminating the need for separate tests for each antigen class
2Measurement precision
If multiple antigen extracts are applied to the same test surface, then comprehensive antigen coverage is achieved, but the risk of extract interference and false positives increases
Solution Approach 1:
The patent applies preliminary blocking steps before antigen extraction to prevent non-specific binding. The test surface is pre-treated with blocking agents to saturate non-specific binding sites, reducing the risk of false positives when multiple antigen extracts are subsequently applied to the same surface
Solution Approach 2:
The patent uses species-specific secondary antibodies as intermediaries to detect antibody binding. These tagged antibodies provide a clear signal amplification mechanism while maintaining specificity, allowing differentiation of true positive signals from background noise in the complex multi-antigen assay
3Loss of information
If C1q binding is included in the assay, then immune complex formation is detected, but the assay time and procedural steps increase
Solution Approach 1:
The patent merges the detection of IgG, IgA, and C1q binding into a single integrated assay performed on the same multi-coated test surface. By combining multiple detection targets in one assay rather than running separate tests, the patent reduces total assay time while comprehensively capturing immune complex formation information
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 provides a more comprehensive immunoreactivity profile by identifying IgG and C1q binding to a wider variety of food antigens, including those not detected by previous methods, enhancing the detection of food immune reactivity and autoimmunity associations.
Implementation Method 1
different groups of antigenic molecules are extracted from foods... Each of these extracts is applied in a specified order to the same test surface to provide a multiple-coated test surface that includes antigens from each of these different extracts
Implementation Method 2
IgG, IgA, and C1q (in the form of native Immunoglobulin-C1q complexes) that bind to these antigens are identified by exposing the test surface to a sample, washing to remove excess sample, and contacting the exposed test surface with species-specific antibodies to IgG and/or IgA and antibodies to C1q that carry a detectable tag
Data Source
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AI summary
Compositions and methods for accurately characterizing immune reactivity to food allergens have been developed, in which test surfaces that incorporate different food antigen preparations derived from the same food into individual test sites are provided. Such coated surfaces can be produced using raw and cooked foods. The use of a panel of such test surfaces to characterize specific IgG, IgA, and/or C1q binding provides improved sensitivity and accuracy in determining immune reactivity and response to specific foods.