Electrodeposited Mediator Layers for Low-Interference Biosensors
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Solution Overview
Problem
Existing biosensors for in-vivo analyte monitoring face challenges such as labor-intensive screen printing processes, incomplete layer formation, interference from solvents, and reduced sensitivity due to enzyme and mediator aggregation, as well as issues with redox reactions in limited reducible species in bodily fluids.
Innovation Solution
A biosensor with an electrodeposited mediator layer comprising an electrocatalytic agent, such as MnO2, in conductive contact with a working electrode and an enzyme layer, eliminating the need for screen printing and enhancing reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If screen printing process is used to apply mediator layer, then production can be automated, but manufacturing precision and reliability deteriorate due to labor-intensive operations and error-prone production
Solution Approach 1:
The patent replaces the mechanical screen printing process with an electrochemical deposition process. The mediator layer is applied through electrochemical reactions that deposit the mediator uniformly onto the electrode surface, eliminating the mechanical variability and human error associated with screen printing while maintaining automation capability.
Solution Approach 2:
The patent changes the deposition method from mechanical screen printing to electrochemical deposition by controlling electrical parameters such as potential, current, and deposition time. This allows precise control over mediator layer thickness and uniformity, significantly improving manufacturing precision and reducing variability between batches.
2Ease of manufacture
If screen printing with solvents like DEGMBE is used, then mediator layer can be applied, but measurement precision deteriorates due to interference from residual solvents
Solution Approach 1:
The patent replaces solvent-based screen printing with electrochemical deposition, which uses aqueous electrolyte solutions instead of organic solvents like DEGMBE. This substitution eliminates residual solvent interference that compromises measurement precision, while the electrochemical process remains easy to implement and control.
Solution Approach 2:
The patent creates an inert deposition environment by using electrochemical deposition in aqueous electrolyte solutions, which leaves no interfering organic solvent residues. This inert environment ensures that the mediator layer is free from contaminants that would otherwise interfere with analyte detection accuracy.
3Measurement precision
If electrode surface area is increased to enhance signal strength, then detection sensitivity improves, but device complexity increases due to multiple electroplating layers
Solution Approach 1:
The patent creates a composite mediator layer that combines multiple functional components in a single deposition process. The mediator layer incorporates electrocatalytic agents and other functional materials simultaneously, achieving enhanced signal strength and detection sensitivity without requiring multiple separate electroplating layers, thus maintaining device simplicity.
4Ease of operation
If continuous in-vivo glucose monitoring is implemented, then convenience is improved, but reliability deteriorates due to high zero currents and interference
Solution Approach 1:
The patent optimizes electrochemical parameters including deposition potential, current density, and mediator concentration to minimize background currents. The controlled electrochemical deposition creates a mediator layer with optimal properties that reduces non-specific signals, thereby improving the reliability and accuracy of continuous in-vivo glucose monitoring.
Solution Approach 2:
The patent creates a localized mediator layer with specific properties at the electrode surface through controlled electrochemical deposition. The mediator concentration and distribution are optimized locally at the sensing interface, ensuring high sensitivity for analyte detection while maintaining low background currents, thus improving both convenience and reliability of continuous monitoring.
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 electrodeposited mediator layer provides a homogeneous, adherent surface, reduces interference, and improves sensitivity by ensuring precise mediator and enzyme distribution, thus enhancing the biosensor's performance and reducing manufacturing variability.
Implementation Method 1
wherein said mediator layer is an electrodeposited mediator layer
Implementation Method 2
said mediator layer comprises, in an embodiment consists of, an electrocatalytic agent
Implementation Method 3
the working electrode comprises at least one detector substance adapted to perform an oxidation reaction or a reduction reaction with the analyte
Implementation Method 4
an enzyme layer in diffusion-enabling contact with said mediator layer
Data Source
AI summary
The present invention relates to a biosensor for determining an analyte comprising a substrate, a working electrode comprising an electrically conductive pad in conductive contact with a mediator layer, and an enzyme layer in diffusion-enabling contact with said mediator layer, wherein said mediator layer is an electrodeposited mediator layer, and wherein said mediator layer comprises, in an embodiment consists of, an electrocatalytic agent. The present invention further relates to a method for manufacturing a biosensor, comprising providing a substrate having at least one conductive pad, electrodepositing a mediator layer onto at least part of said conductive pad, wherein said mediator layer comprises, in an embodiment consists of, an electrocatalytic agent, and depositing an enzyme layer onto at least part of said mediator layer. Moreover, the present invention relates to uses and methods related to the biosensor of the present invention.