Enzyme Sensor with Anchored Cofactor for Ketone Detection
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Solution Overview
Problem
Current methods for in vivo monitoring of ketone bodies are inadequate for real-time detection and measurement, particularly in diabetic patients at risk of diabetic ketoacidosis, due to limitations in sensitivity and stability of existing sensors.
Innovation Solution
A sensor design incorporating a working conductor with an electrode reactive surface, featuring a first reactive chemistry that includes an enzyme, a transport material, and an entrappable cofactor anchored to prevent migration, enabling continuous real-time electrochemical sensing of ketones and other analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensor designs are used for ketone detection, then the device complexity is low, but the measurement precision and reliability are insufficient for real-time monitoring
Solution Approach 1:
The sensor is divided into distinct functional layers: a membrane layer for selective analyte transport, a reactive chemistry layer containing enzyme and cofactor for specific ketone detection, and an electrode layer for electrochemical signal generation. This segmentation allows each layer to be optimized independently for its specific function, improving overall measurement precision while managing complexity through modular design
Solution Approach 2:
The sensor employs composite material structures including enzyme-cofactor complexes embedded in a reactive matrix, combined with selective membrane materials. This composite approach enables simultaneous achievement of high selectivity (through membrane filtration), high sensitivity (through enzyme-catalyzed reaction), and stable signal transduction (through electrochemical materials), resolving the contradiction between precision and complexity
2Duration of action of stationary object
If existing sensor technologies are applied, then the manufacturing process is simple, but the sensor lifespan and stability are inadequate for continuous monitoring
Solution Approach 1:
The cofactor is pre-entrapped within the reactive chemistry matrix during manufacturing, creating a stable enzyme-cofactor complex before the sensor is deployed. This preliminary entrapment prevents cofactor leakage and degradation during operation, significantly extending sensor lifespan. The manufacturing process incorporates this entrapment step, which while adding some complexity, ensures long-term stability for continuous monitoring applications
Solution Approach 2:
The sensor design accepts that the reactive chemistry layer (containing enzyme and cofactor) has a finite lifespan and can be replenished or replaced. This approach allows the use of less stable but highly sensitive biochemical components that would otherwise be too expensive or complex to maintain, while the overall sensor structure remains manufacturable and replaceable
3Measurement precision
If conventional electrochemical sensing methods are used, then the device is simple to operate, but the sensitivity and linearity for low-concentration ketone detection are insufficient
Solution Approach 1:
An enzyme cofactor (such as NAD+ or FAD) is introduced as an intermediary substance that mediates the reaction between ketone bodies and the electrode. The cofactor accepts electrons from the enzyme-catalyzed oxidation of ketones and transfers them to the electrode surface, amplifying the signal and improving sensitivity. This intermediary mechanism enables detection of low-concentration ketones with high linearity, justifying the added complexity in the reactive chemistry structure
Solution Approach 2:
The sensor optimizes parameters including enzyme concentration, cofactor-to-enzyme ratio, membrane porosity, and electrode surface area to maximize sensitivity. By carefully controlling these parameters during manufacturing, the sensor achieves high detection sensitivity and linearity for low-concentration ketones while keeping the reactive chemistry structure as compact and manageable as possible
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 sensor provides improved sensitivity, linearity, and extended lifespan for in vivo monitoring of ketones, enabling timely detection and management of diabetic ketoacidosis.
Implementation Method 1
a second transport material that enables diffusion of the first analyte to the first reactive chemistry
Implementation Method 2
The first reactive chemistry includes an enzyme
Implementation Method 3
electrochemical sensors that provide information regarding the presence or amount of an analyte
Data Source
AI summary
In one embodiment, a sensor to measure the presence of an analyte is disclosed. The sensor includes a working conductor with an electrode reactive surface. The sensor further includes a first reactive chemistry that is responsive to a first analyte and is in direct contact with the electrode reactive surface. The first reactive chemistry includes an enzyme, a first transport material, and an entrappable cofactor that includes a cofactor for the enzyme coupled to an anchor molecule. The sensor further includes a second transport material that enables diffusion of the first analyte to the first reactive chemistry.