Electrochemical Sensor Layout With Separated Binding and Sensing Surfaces
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Solution Overview
Problem
Existing electrochemical sensors for detecting target analytes are limited by high costs, complexity, and the inability to miniaturize for point-of-care testing, with calibration prone to inaccuracies due to sample handling and matrix interference.
Innovation Solution
A sensor design featuring a support substrate with protruding surface structures containing an electrode layer and a separated binding region, allowing for electrochemical detection of target analytes through a detectable response at the sensing surface, utilizing magnetic particles and binding agents for specific target recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrochemical sensors use traditional integrated binding agent and sensing surface design, then device integration is achieved, but measurement precision deteriorates due to matrix interference and sample handling errors
Solution Approach 1:
The sensor is divided into two separate surfaces: a binding surface where the binding agent captures the target analyte, and a sensing surface that detects the bound complex. This segmentation isolates the sensing process from matrix interference that affects the binding process, thereby improving measurement precision while maintaining device integration.
Solution Approach 2:
A separator layer is introduced as an intermediary between the binding surface and sensing surface. This separator allows the bound analyte-complex to transfer from the binding surface to the sensing surface while preventing direct contact between the binding agent and the sensing detection system, reducing matrix interference effects.
2Ease of operation
If electrochemical sensors are miniaturized for point-of-care testing, then ease of operation is improved, but manufacturing precision deteriorates due to production complexity
Solution Approach 1:
The sensor substrate is divided into distinct binding and sensing regions that can be manufactured separately and then integrated. This segmentation allows each region to be optimized independently for miniaturization while simplifying the overall manufacturing process through modular assembly.
Solution Approach 2:
The sensor design uses a single substrate that performs multiple functions: binding analyte, separating the bound complex, and detecting the analyte. This multi-functional integration reduces the number of separate components needed, simplifying manufacturing while enabling miniaturized point-of-care devices.
3Device complexity
If binding agent is placed directly on sensing surface, then device complexity is reduced, but measurement precision deteriorates due to interference from binding region
Solution Approach 1:
The sensor structure separates the binding agent-containing binding surface from the sensing surface. This segmentation prevents the binding region materials and processes from interfering with the sensing detection, improving signal accuracy while maintaining relatively simple overall device structure.
Solution Approach 2:
The binding agent is extracted from the sensing surface and placed on a separate binding surface. This extraction eliminates the source of interference that would occur if the binding agent were present on the sensing surface, thereby improving measurement precision.
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 and reproducible detection of target analytes with reduced complexity and cost, suitable for point-of-care applications by minimizing interference and improving calibration precision.
Implementation Method 1
Electrochemical sensors provide an attractive means to achieve quantitative analysis of the content of a sample due to the direct transduction of a biochemical event to an electronic signal
Implementation Method 2
Electrochemical sensors are designed to be highly target-specific so as to be able to detect the presence (and preferably the concentration) of the target analyte (TA) in a sample. Binding agents may include enzymes, nucleic acids, antibodies, whole cells or receptors
Implementation Method 3
Since the reduction of TMB can be measured galvanostatically (i.e. via current across electrodes), this provides a measurement of the concentration of the TA in the sample
Data Source
AI summary
A sensor includes: a support substrate; at least one surface structure protruding from an upper surface of the support substrate, wherein the surface structure includes an electrode layer; a sensing surface on the electrode layer, wherein the sensing surface is adapted to contact a sample containing a target analyte; a binding region on the support substrate, wherein the binding region is separated from the sensing surface; wherein, in use, a binding agent attached to a binding layer at the binding region is also adapted to contact the sample containing the target analyte.