Composite Electrode Strip for Signal Amplification
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Solution Overview
Problem
Existing electrochemical biosensors face challenges in amplifying redox electrical signals, particularly at low concentrations, and require complex preparation procedures, leading to low signal/noise ratios and labor-intensive detection methods.
Innovation Solution
An electrode strip is developed with a nano-scaled gold particle layer and a lipid-soluble electron mediator layer, which synergistically amplifies electrochemical signals, reducing the need for complex preparation processes and enhancing signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional electrochemical biosensor is used, then the detection can be performed with simple structure, but the signal amplification is insufficient and the signal/noise ratio is low
Solution Approach 1:
The patent employs a composite modified electrode combining nano-scaled gold particles and lipid-soluble electron mediators on the electrode surface. This composite structure synergistically amplifies electrochemical signals through the catalytic activity of gold nanoparticles and the electron transfer capability of lipid mediators, achieving high signal amplification while maintaining a relatively simple two-layer preparation process
Solution Approach 2:
The patent applies different materials with specific functions at different locations on the electrode surface. Nano-scaled gold particles are distributed on the electrode surface to provide catalytic activity and signal amplification, while lipid-soluble electron mediators are positioned at the interface to facilitate electron transfer. This localized functional distribution optimizes signal amplification without requiring complex multi-step preparation procedures throughout the entire electrode
2Measurement precision
If co-factors like NADH are used to improve electron transportation efficiency, then the sensitivity increases, but the enzyme immobilization procedure becomes complex and stability under room temperature deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrode surface by introducing nano-scaled gold particles and lipid-soluble electron mediators. This modification alters the electron transfer kinetics and reduces the resistance of electron transportation from the enzyme during catalytic reactions, achieving high sensitivity comparable to NADH-based systems but with simpler immobilization procedures and improved room temperature stability
Solution Approach 2:
The patent uses lipid-soluble electron mediators that can be simply coated on the electrode surface and provide stable performance at room temperature without requiring complex immobilization of co-factors like NADH. This approach uses readily available materials and simple preparation methods, making the biosensor more suitable for transportation and storage while maintaining high sensitivity
3Measurement precision
If the concentration of target molecules is low, then the detection challenge increases, but the current sensor cannot distinguish the electric signal from background noise
Solution Approach 1:
The composite modified electrode with nano-scaled gold particles and lipid-soluble electron mediators provides synergistic signal amplification that significantly enhances the electrochemical signal from low concentration target molecules. This amplification effect increases the signal intensity above the background noise level, enabling accurate detection of low concentration targets that would otherwise be undetectable
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 electrode strip effectively amplifies redox electric signals, simplifies the preparation process, and improves detection accuracy, allowing for the detection of lower concentrations of target molecules with reduced noise interference.
Implementation Method 1
a nano-scaled gold particle layer and a lipid-soluble electron mediator layer so that the electrochemical signal measured by the electrode strip can be synergistically amplified
Implementation Method 2
the electron transporter has the property of reversing the reduction/oxidation reactions so that it can receive the electrons produced from the enzymatic-catalyzing reaction and become the reduced form, and the oxidation reaction on the surface of the electrode can pass the electrons to the electrode so as to generate electric signals
Data Source
AI summary
The present invention provides a surface-modified electrode strip for measuring an electrochemical signal that is synergistically amplified by means of a nano-scaled gold particle layer and a lipid-soluble electron mediator layer. A biosensor comprising the electrode strip is also provided.