AC Biosensor Signal Amplification via Redox Cycling
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Solution Overview
Problem
Current biosensors face challenges in accurately detecting small amounts of analytes in biological samples due to limited signal amplification, particularly when using direct current, and the use of alternating current is not commonly employed for analyte detection.
Innovation Solution
A biosensor kit that utilizes alternating current (AC) with specific voltage and frequency to induce redox cycling between electrodes, amplifying the signal for more precise measurement and concentration analysis of biological samples, including the use of electrochemical cells and enzymes to enhance signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct current (DC) is used for signal amplification, then signal amplification can be achieved, but the measurement precision is limited and background interference increases
Solution Approach 1:
The patent applies periodic action by using alternating current (AC) instead of direct current (DC) to drive the electrochemical reactions. The AC signal periodically reverses the polarity between working and counter electrodes, creating cyclic oxidation-reduction reactions that amplify the analytical signal while the periodic nature helps distinguish signal from background interference through frequency discrimination
Solution Approach 2:
The patent changes the electrical parameter from DC to AC with specific voltage and frequency characteristics. By optimizing the AC signal parameters (voltage amplitude, frequency), the system achieves enhanced signal amplification through redox cycling while minimizing background interference, representing a parameter change that resolves the contradiction between measurement precision and background interference
2Measurement precision
If alternating current (AC) is used for analyte detection, then signal amplification is enhanced, but the device complexity increases
Solution Approach 1:
The patent extracts and utilizes the redox cycling phenomenon that occurs naturally in electrochemical systems when subjected to AC signals. By taking out this inherent amplification mechanism and optimizing the AC signal parameters, the system achieves signal enhancement without adding complex external amplification devices, thus improving measurement precision while limiting device complexity increases
Solution Approach 2:
The patent uses the electrochemical mediator (redox-active species) as an intermediary that facilitates signal amplification. The mediator shuttles electrons between electrodes during AC cycles, enabling signal enhancement through a well-defined chemical mechanism rather than requiring complex electronic amplification circuits, thereby managing device complexity
3Measurement precision
If redox cycling is induced between electrodes, then signal amplification increases, but the use of AC is not commonly employed and requires specific voltage and frequency parameters
Solution Approach 1:
The patent changes the electrical operating parameters from conventional DC to AC with specific optimized voltage and frequency values. This parameter change enables redox cycling and signal amplification while the patent addresses adaptability by providing guidance for optimizing these parameters for different analytes and biosensor configurations, making the approach more versatile across applications
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 AC-based biosensor kit effectively amplifies signals, enabling more accurate detection and quantification of analytes in biological samples, improving measurement precision and reducing background interference.
Implementation Method 1
provide the alternating current signal having a voltage and frequency suitable to induce an electric current across at least two electrodes to induce redox cycling between the at least two electrodes to create an amplified signal
Implementation Method 2
The biosensor may then be exposed to a transducer or detector element which may work in a physiochemical manner using a sensing medium such as light, electricity, piezoelectric, electrochemical, or the like
Data Source
AI summary
Fluid collection devices, analysis instruments and methods for making and using same are disclosed. The fluid collection device is provided with a device and an electrochemical cell. The device has first and second walls defining a microfluidic channel, and a sample application port communicating with the microfluidic channel. The first wall and the second wall are spaced a distance less than 150 microns. The electrochemical cell is disposed on the first wall to contact a sample travelling through the microfluidic channel. The electrochemical cell comprising molecule receptors such that a physical property of the first electrochemical cell is effected upon one or more of the molecule receptors binding to an electroactive species within the sample.