Biosensor Polymer Permeation Layer for High-Concentration Detection
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Solution Overview
Problem
Existing biosensors face limitations in measurable concentration ranges due to enzyme affinity for substrates, leading to restricted detection of high-concentration substrates, particularly when enzymes with high affinity are used.
Innovation Solution
A biosensor design incorporating a permeation control layer composed of a water-soluble and water-insoluble polymer to stabilize enzymes and control substrate diffusion, allowing for a wider detection range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an enzyme with high affinity for substrate is used, then the reaction sensitivity is improved, but the measurable concentration range is limited
Solution Approach 1:
The patent changes the physical-chemical parameters of the enzyme environment by introducing a permeation control layer with specific polymer compositions (water-soluble and water-insoluble polymers in controlled ratios). This layer modifies the local concentration, viscosity, and diffusion characteristics around the enzyme, allowing the enzyme to maintain high affinity while operating effectively across a broader substrate concentration range
Solution Approach 2:
The patent uses composite materials in the permeation control layer, combining water-soluble polymers (e.g., PVA, HEC, HPC, CMC, cellulose acetate, PVP) with water-insoluble polymers (e.g., PU, PC, PVC). This composite structure creates a matrix that controls substrate diffusion while stabilizing the enzyme, resolving the contradiction between high sensitivity and wide measurable range
2Adaptability or versatility
If an enzyme with low affinity for substrate is used, then the measurable concentration range is expanded, but the reaction sensitivity decreases
Solution Approach 1:
The permeation control layer modifies the local environment parameters (concentration, viscosity, diffusion rate) to enhance enzyme-substrate interaction efficiency. This allows even low-affinity enzymes to achieve adequate reaction sensitivity while maintaining a broad measurable concentration range through controlled substrate delivery
3Adaptability or versatility
If a permeation control layer with polymer composition is introduced, then the detection range is improved, but the device complexity increases
Solution Approach 1:
The patent segments the sensor structure into distinct functional layers, with the permeation control layer as a separate component between the enzyme reaction layer and the sample environment. This segmentation allows independent optimization of each layer's properties while maintaining overall system manageability and manufacturability
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 permeation control layer enhances the biosensor's ability to detect high-concentration substrates by stabilizing enzymes and adjusting the detection range, improving sensitivity and resolution.
Implementation Method 1
control substrate diffusion
Implementation Method 2
stabilizing enzymes
Data Source
AI summary
A biosensor according to an embodiment of the present invention includes a substrate, a working electrode disposed on the substrate, and a reference electrode disposed on the substrate to be spaced apart from the working electrode. The working electrode includes a sensing electrode disposed on a top surface of the substrate, an enzyme reaction layer disposed on a top surface of the sensing electrode, and a permeation control layer disposed on a top surface of the enzyme reaction layer, and the permeation control layer includes a water-soluble polymer and a water-insoluble polymer. The permeation layer includes a mixture of the water-soluble polymer and the water-insoluble polymer to improve a sensing performance for a sensing target material.