Immunobiosensor Conformational Change for Metal Ion Detection
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Solution Overview
Problem
Current methods for measuring polyvalent metal ions like calcium in blood and food samples face challenges such as high costs, complexity, and low accuracy, especially in complex matrices, and lack suitable alternatives for point-of-care testing.
Innovation Solution
An immunobiosensor using a membrane lateral flow immuno-chromatographic assay that detects conformational changes in metal binding proteins upon ion binding, employing antibodies and signal generators like colloidal gold to produce a reaction signal, allowing for quantitative analysis of metal ions like Ca2+, Fe2+, Fe3+, Zn2+, Mn2+, Mg2+, and Cu2+, using a smartphone-based system for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ion measurement techniques (ion-selective electrodes) are used to detect polyvalent metal ions, then the measurement process is simple and equipment is available, but the analytical performance deteriorates with false positives and increased measurement variations in complex matrices like blood samples
Solution Approach 1:
The patent introduces a specific antibody as an intermediary recognition element that selectively binds to the target metal ion (e.g., calcium) in complex matrices. The antibody acts as a mediator between the complex sample matrix and the detection system, providing high selectivity and preventing false positives while maintaining ease of operation through the immunobiosensor platform
Solution Approach 2:
The immunobiosensor combines multiple components including the specific antibody, signal generator (e.g., colloidal gold), and membrane support into a composite sensing system. This composite structure integrates the selectivity of biological recognition elements with the detection capabilities of signal generators, achieving both high measurement precision and operational simplicity
2Measurement precision
If conventional analytical methods are used for metal ion measurement, then measurement accuracy can be maintained, but the cost and complexity increase significantly
Solution Approach 1:
The patent employs a disposable immunobiosensor format where the antibody-based sensing element and membrane are designed as single-use components. This eliminates the need for complex, expensive, and reusable analytical equipment while maintaining measurement accuracy, as each disposable unit is pre-calibrated and optimized for specific metal ion detection
Solution Approach 2:
The patent replaces complex mechanical and instrumental analytical systems with a biochemical recognition system based on antibody-antigen interactions. The detection is achieved through biological specificity rather than complex instrumentation, significantly reducing device complexity while preserving measurement precision
3Measurement precision
If conventional analytical methods are used for metal ion detection, then reliable results can be obtained, but the time and cost for reagents and equipment increase
Solution Approach 1:
The immunobiosensor is pre-prepared with the specific antibody and signal generator components immobilized on the membrane before use. This preliminary preparation eliminates the need for time-consuming sample processing, reagent mixing, and instrument calibration during actual testing, enabling rapid and reliable metal ion detection in minimal time
Solution Approach 2:
The immunobiosensor is designed as a self-contained system where the antibody-based recognition element automatically binds to the target metal ion in the sample, and the signal generator autonomously produces the detection signal. This self-service mechanism eliminates the need for complex operational procedures, reducing both time and cost while maintaining result reliability
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
Enables accurate, cost-effective, and rapid measurement of metal ions, suitable for medical diagnostics and food inspection, reducing the need for expensive reagents and equipment, and providing reliable results in complex samples.
Implementation Method 1
a metal binding protein whose conformation changes upon reaction with a metal ion in a sample
Implementation Method 2
a sensing antibody reacting with the conformationally changed metal binding protein as an antigen
Implementation Method 3
a signal generator reacting with the signal conjugate to generate a reaction signal
Data Source
AI summary
An immunobiosensor is disclosed. The immunobiosensor is based on a membrane lateral flow immuno-chromatographic assay (LF-ICA). The immunobiosensor includes: a metal binding protein 10 whose conformation changes upon reaction with a metal ion 1 in a sample; a sensing antibody 20 reacting with the conformationally changed metal binding protein 10 as an antigen; a signal substance 30 conjugated with the metal binding protein 10 or the sensing antibody 20 to form a signal conjugate 30a or 30b; a signal generator 40 reacting with the signal conjugate 30a or 30b to generate a reaction signal; and a reaction strip 50 in the form of a porous membrane adapted to move the sample and where the antigen-antibody reaction occurs and the reaction signal is generated. Also disclosed is a sensor system including the immunobiosensor.