Biosensor Interferent Detection via Electrode Potential Switching
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Solution Overview
Problem
Current biosensors face challenges in accurately detecting interferents in body fluids, leading to measurement errors in glucose monitoring, as existing methods are either ineffective or require additional electrodes and complex circuit components.
Innovation Solution
A method involving a biosensor with three electrodes, where the first and second electrodes are covered by a membrane and include an enzyme, while the third electrode is also covered by a membrane, connected via a potentiostat, allowing for a switch from normal operational mode to interferent detection mode by altering the electrical potential difference, enabling the measurement of current-voltage characteristics to determine interferent contribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional electrodes and complex circuit components are used to detect interferents, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The third electrode serves multiple functions: it acts as a counter electrode during normal glucose measurement operations and as an interferent detection electrode when the potential is switched. This multi-functionality eliminates the need for separate dedicated interferent detection electrodes, reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The electrode's functional role is dynamically switched between normal measurement mode and interferent detection mode by altering the electrical potential difference applied to the third electrode. This dynamic switching allows a single electrode configuration to perform multiple measurement tasks, avoiding the need for additional fixed-function electrodes.
2Adaptability or versatility
If the electrical potential difference is altered to detect interferents, then interferent detection capability is improved, but normal measurement operation is disrupted
Solution Approach 1:
The system periodically switches between normal measurement mode and interferent detection mode by alternating the electrical potential difference applied to the third electrode. This periodic switching allows the system to perform interferent detection at specific intervals without continuously disrupting glucose measurements, maintaining both detection capability and measurement reliability.
Solution Approach 2:
The interferent detection is performed at specific times (e.g., before or after glucose measurements) by preliminarily switching the potential configuration. This timing strategy ensures that interferent detection does not interfere with the primary glucose measurement operation, maintaining measurement continuity while providing adaptability.
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 allows for efficient detection of interferents and their impact on biosensor measurements without additional electrodes or complex circuit components, providing accurate and unambiguous results applicable to multiple interferents.
Implementation Method 1
the first electrode further includes an enzyme or wherein the first electrode is covered by an enzyme layer
Implementation Method 2
the first electrode allows for oxidative processes
Implementation Method 3
the first electrode, the second electrode, and the third electrode are connected via a potentiostat, wherein, in a normal operational mode, via the potentiostat an electrical potential difference is applied between the first electrode and the second electrode
Data Source
AI summary
A method for detecting an interferent contribution in a biosensor is disclosed. Herein, the biosensor has a first electrode (112), a second electrode, and a third electrode (114), wherein the first electrode (112) and the second electrode are covered by a membrane, wherein the first electrode (112) further includes an enzyme or wherein the first electrode (112) is covered by an enzyme layer. Further, the first electrode (112), the second electrode, and the third electrode (114) are connected via a potentiostat, wherein, in a normal operational mode, via the potentiostat an electrical potential difference is applied between the first electrode (112) and the second electrode in a manner that the first electrode (112) allows for oxidative processes and the third electrode (114) allows for reductive processes. The method comprises the steps of:a) switching from the normal operational mode to an interferent detection mode, wherein, in the interferent detection mode, the electrical potential difference between the first electrode (112) and the second electrode is altered for a limited period of time in a manner that the third electrode (114) allows for oxidative processes;b) measuring a current-voltage characteristic (110) of the third electrode (114); andc) determining the interferent contribution in the biosensor by evaluating the current-voltage characteristic (110) of the third electrode (114).The method allows deducting the presence and, preferably, the amount of the interferent in an unambiguous way and is, generally, applicable in case of more than one kind of interferent. Neither additional working electrodes nor supplementary circuit components are required. The method is implementable within sensor electronics architectures of standard biosensors and, thus, applicable in already existing biosensor systems.