NAD(P)-Dependent Sensor Electrodes With Mediated Electron Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing analyte sensors lack stability and sensitivity for accurately measuring NAD(P)+-dependent analytes such as glucose, alcohol, and β-hydroxybutyrate, necessitating improved enzyme compositions and sensor designs for clinical accuracy and extended monitoring.
Innovation Solution
Enzyme compositions incorporating NAD(P)+, NAD(P)+-dependent dehydrogenases, NAD(P)H oxidoreductases, and electron transfer agents with transition metal complexes, immobilized on electrodes using polymers and crosslinkers, enabling clinically accurate electrochemical measurements of analytes within seconds and over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional enzyme compositions are used in analyte sensors, then the sensors can measure analytes, but the sensors lack stability and sensitivity for accurate measurements
Solution Approach 1:
The patent employs a composite enzyme composition comprising NAD(P)+-dependent dehydrogenase, NAD(P)H oxidoreductase, and electron transfer agent with transition metal complex. This multi-enzyme composite system enhances both measurement precision and sensor stability by distributing functional roles across multiple enzyme components, where each enzyme contributes specific catalytic activities that collectively improve analytical performance and operational reliability.
Solution Approach 2:
The patent introduces NAD(P)H oxidoreductase and electron transfer agents as intermediary components between the dehydrogenase and the electrode. These intermediaries facilitate efficient electron transfer from NAD(P)H to the electrode surface, thereby enhancing signal sensitivity and measurement accuracy while maintaining system stability through controlled electron flow pathways.
2Measurement precision
If conventional enzyme compositions are used, then sensors can be fabricated, but they lack sensitivity for rapid and accurate analyte detection
Solution Approach 1:
The patent establishes a continuous catalytic cycle where NAD(P)+-dependent dehydrogenase continuously converts analyte to NAD(P)H, which is then rapidly reoxidized by NAD(P)H oxidoreductase, maintaining continuous electron flow to the electrode. This continuous action eliminates measurement delays and ensures rapid, real-time detection with high sensitivity.
Solution Approach 2:
The patent optimizes kinetic parameters of the enzyme composition by selecting specific NAD(P)+-dependent dehydrogenases with high catalytic efficiency and matching them with compatible NAD(P)H oxidoreductases and electron transfer agents. This parameter optimization accelerates the overall reaction rate, enabling rapid analyte detection within seconds while maintaining high detection sensitivity.
3Duration of action of stationary object
If simple enzyme compositions are used, then sensor fabrication is straightforward, but the sensors lack stability for extended monitoring
Solution Approach 1:
The patent segments the enzymatic function into distinct modular components: NAD(P)+-dependent dehydrogenase for analyte oxidation, NAD(P)H oxidoreductase for cofactor regeneration, and electron transfer agent for signal generation. This segmentation allows each component to be independently optimized and assembled, enhancing overall system stability for extended monitoring while managing complexity through functional modularity.
Solution Approach 2:
The patent employs a universal NAD(P)+-based enzymatic system that can monitor multiple analytes (glucose, alcohol, β-hydroxybutyrate) using the same fundamental enzyme composition architecture. This multi-functionality extends sensor utility and monitoring duration across different analyte applications without requiring complete redesign, thereby enhancing operational longevity.
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 enzyme compositions provide clinically accurate, rapid, and stable electrochemical measurements of analytes, with linear signal response to analyte concentration, suitable for in vivo monitoring of glucose, alcohol, and β-hydroxybutyrate, using sensors that are reliable and stable for accurately measuring glucose, alcohol, and β-hydroxybutyrate, and the sensor may have one or more electrodes with the enzyme composition.
Implementation Method 1
glucose can be oxidized by NAD-dependent glucose dehydrogenase, alcohol can be oxidized by NAD-dependent alcohol dehydrogenase, β-Hydroxybutyrate can be oxidized by NAD-dependent D-3-Hydroxybutyrate dehydrogenase
Implementation Method 2
NAD(P)+-dependent dehydrogenases
Implementation Method 3
NAD(P)H oxidoreductase
Implementation Method 4
electron transfer agent having a transition metal complex
Implementation Method 5
one or more of the nicotinamide adenine dinucleotide phosphate (NAD(P)+) or derivative thereof, NAD(P)+-dependent dehydrogenase, NAD(P)H oxidoreductase and redox mediator are immobilized on the surface by the polymer
Implementation Method 6
one or more of the nicotinamide adenine dinucleotide phosphate (NAD(P)+) or derivative thereof, NAD(P)+-dependent dehydrogenase, NAD(P)H oxidoreductase and redox mediator are covalently bonded to the polymer
Data Source
AI summary
NADP-dependent oxidoreductase compositions, and electrodes, sensors and systems that include the same. Analyte sensors include an electrode having a sensing layer disposed thereon, the sensing layer comprising a polymer and an enzyme composition distributed therein. The enzyme composition includes nicotinamide adenine dinucleotide phosphate (NAD(P)+) or derivative thereof; an NAD(P)+-dependent dehydrogenase; an NAD(P)H oxidoreductase; and an electron transfer agent comprising a transition metal complex.