Electron Mediator System for Biosensor Potential Tuning
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Solution Overview
Problem
Existing electron mediators in electrochemical biosensors, such as potassium ferricyanide, are prone to degradation and have fixed oxidation potentials, making it difficult to achieve a working potential compatible with enzyme-coenzyme complexes and electrode materials, leading to inaccurate analyte concentration measurements.
Innovation Solution
An electron mediator system comprising a first and second transition metal complex, where the working potential is adjusted by varying the molar fraction of these complexes, allowing for a compatible and adaptable electron transfer efficiency without the need for synthesizing new mediators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed oxidation potential electron mediator (e.g., potassium ferricyanide) is used, then the electron transfer function is provided, but the working potential cannot be adjusted to match different enzyme-coenzyme complexes and electrode materials
Solution Approach 1:
The patent uses a composite electron mediator system comprising two different electron mediators with distinct oxidation potentials. This composite system enables adjustable working potential by controlling the ratio of the two mediators, providing compatibility with various enzyme-coenzyme complexes and electrode materials without requiring synthesis of new mediator compounds.
Solution Approach 2:
The patent adjusts the working potential of the electron mediator system by changing the concentration ratio parameter of the two electron mediators. By varying the molar ratio between the first and second electron mediators, the overall working potential of the system can be tuned to match different biochemical components, achieving adaptability through parameter optimization rather than structural modification.
2Reliability
If potassium ferricyanide is used as electron mediator, then electron transfer is achieved, but the mediator deteriorates under light, temperature, and humidity affecting long-term storage stability
Solution Approach 1:
The patent employs a composite electron mediator system where two different electron mediators are combined. This composite approach distributes the functional load and reduces the vulnerability to degradation of any single mediator component, improving overall system stability under storage conditions while maintaining electron transfer functionality.
Solution Approach 2:
The patent uses commonly available electron mediators with known stability characteristics, accepting that individual components may have limited stability but designing the system to function effectively within the operational timeframe before degradation occurs, optimized for disposable or short-term use scenarios.
3Productivity
If working potential is increased to improve electron transfer efficiency, then electron transfer speed increases, but direct oxidation of materials other than analyte occurs causing measurement inaccuracy
Solution Approach 1:
The patent optimizes the working potential by adjusting the ratio of two electron mediators with different oxidation potentials. This parameter optimization allows achieving sufficient electron transfer efficiency while maintaining the working potential below the oxidation voltage of interfering materials, preventing false positive signals and ensuring measurement accuracy.
Solution Approach 2:
The patent creates different functional zones within the electron mediator system by using mediators with different oxidation potentials. The first electron mediator handles electron transfer from the enzyme-coenzyme complex at a lower potential, while the second mediator provides the necessary potential gradient for electrode interaction, with each component operating in its optimal potential range to avoid interference.
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
This approach enables reproducible and adjustable working potentials, enhancing electron transfer efficiency and compatibility with various enzyme-coenzyme complexes and electrode materials, thereby improving the accuracy of analyte concentration measurements in biosensors.
Implementation Method 1
The enzyme-coenzyme complex obtained electrons from the analyte may be oxidized, transferring electrons to the electron mediator. The electron mediator, which received electrons from the enzyme-coenzyme complex, may be reduced. The reduced electron mediator may be oxidized to transfer electrons to the working electrode.
Data Source
AI summary
Provided is an electron mediator system, which may include a first transition metal complex and a second transition metal complex, wherein a working potential of the electron mediator system may be substantially the same as a molar average of a working potential of the first transition metal complex and a working potential of the second transition metal complex.