Impedance Biosensor with Conducting Polymer Electrodes for Rapid Viral Detection
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Solution Overview
Problem
Conventional diagnostic methods for viral infections, such as PCR and ELISA, are time-consuming, expensive, and require specialized laboratories and trained personnel, making them unsuitable for fast and cost-effective point-of-care diagnostics.
Innovation Solution
A biosensor using impedance spectroscopy with a non-conducting substrate, conducting polymer electrodes, and a probe layer for selective binding of target substances, allowing for rapid, sensitive, and reliable detection of viruses and other analytes without the need for additional electrodes or labeling, facilitating point-of-care testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic methods (PCR, ELISA) are used, then reliable detection results are obtained, but the analysis time is long and the cost is high
Solution Approach 1:
The patent replaces complex mechanical and chemical diagnostic procedures (PCR, ELISA) with an electrochemical impedance sensing system. The biosensor uses electrical impedance spectroscopy to detect target substances, substituting lengthy mechanical processing and chemical reactions with rapid electrical measurements that provide reliable detection results within minutes.
Solution Approach 2:
The patent introduces probe molecules as intermediaries that specifically bind to target substances on the electrode surface. These probe-target interactions serve as the mediator between the electrical measurement system and the biological sample, enabling reliable detection through changes in interfacial impedance without requiring complex downstream processing.
2Measurement precision
If conventional diagnostic methods (PCR, ELISA) are used, then reliable detection results are obtained, but the cost and labor requirements are high
Solution Approach 1:
The patent employs disposable screen-printed electrodes with integrated probe layers that can be discarded after single use. This eliminates the need for expensive, complex equipment and extensive cleaning/sterilization procedures, reducing both equipment costs and labor requirements while maintaining reliable detection through standardized, pre-functionalized sensor surfaces.
Solution Approach 2:
The biosensor platform uses universal probe molecules that can be designed to detect various target substances (viruses, bacteria, proteins) through the same electrochemical impedance measurement system. This multi-functionality eliminates the need for specialized equipment and procedures for each different diagnostic application, reducing overall device complexity and labor requirements.
3Productivity
If impedance biosensors are used for point-of-care diagnostics, then rapid detection is achieved, but the detection limit and specificity may be insufficient
Solution Approach 1:
The patent concentrates probe molecules specifically at the electrode-solution interface where the measurement occurs, creating a localized high-density sensing zone. This local concentration of recognition elements enhances the sensitivity and specificity of detection at the measurement site, enabling rapid detection with sufficient precision despite the simplicity of the overall system.
Solution Approach 2:
The patent uses probe molecules that are chemically synthesized copies or analogs of target-specific binding elements (such as antibody fragments or aptamers). These copied binding elements provide the necessary specificity for accurate detection while being more stable and easier to produce than whole antibodies, maintaining detection limits suitable for point-of-care applications.
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 biosensor reduces analysis time and cost, enabling efficient detection of viral infections and other substances, making it suitable for on-site measurements and mass production, and can be used as a disposable device for point-of-care diagnostics.
Implementation Method 1
Impedimetric biosensors are a class of biosensors used for detection of e.g. viruses using electrochemical impedance spectroscopy (EIS). When a target substance, such as e.g. a target molecule, binds to an impedance biosensor, it will induce a change in the electrode surface/liquid solution interface.
Implementation Method 2
a probe layer bonded to part of the primary electrode surface... wherein the probe layer is adapted for selectively binding of the target substance
Data Source
AI summary
Disclosed herein is a biosensor for detection of a target substance in a sample with impedance spectroscopy, the biosensor comprising 1) a first non-conducting substrate comprising a primary substrate surface; 2) a conducting polymer electrode layer comprising one or more conducting polymers layers, the conducting polymer electrode layer comprising a primary electrode surface and a secondary electrode surface, wherein the secondary electrode surface covers part of the primary substrate surface; 3) a probe layer bonded to part of the primary electrode surface; and 4) a second non-conducting substrate comprising a secondary substrate surface, wherein the secondary substrate surface of the second substrate and the primary substrate surface of the first substrate are interconnected such that the electrode layer and the probe layer are confined within an area defined by the first substrate and the second substrate; wherein the electrode layer comprises at least a first electrode pair, the first electrode pair comprising a primary electrode and a secondary electrode, where the probe layer is bonded to the primary electrode and the secondary electrode of the at least first electrode pair, the probe layer being adapted for selectively binding of the target substance.