NAD(P)-Dependent Sensor Electrodes With Mediated Electron Transfer
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Solution Overview
Problem
Existing analyte sensors lack stability and sensitivity for accurately measuring NAD(P)+-dependent analytes such as glucose, alcohol, and ketones, particularly in biological fluids, necessitating improved enzyme compositions and sensor designs.
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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional enzyme sensors are used for analyte detection, then basic measurement capability is provided, but stability and sensitivity are insufficient for accurate measurement in biological fluids
Solution Approach 1:
The patent employs a composite enzyme system comprising NAD(P)+-dependent dehydrogenase, NAD(P)H oxidoreductase, and electron transfer agent with transition metal complex. This multi-enzyme composite architecture enhances both measurement precision and reliability by creating a coupled reaction system where each component contributes to overall performance, with the electron transfer agent mediating electron flow to improve signal stability and sensitivity
Solution Approach 2:
The electron transfer agent containing transition metal complex serves as an intermediary between the NAD(P)H oxidoreductase and the electrode. This mediator facilitates efficient electron transfer, amplifying the analytical signal while maintaining system stability, thereby resolving the contradiction between measurement precision and sensor reliability
2Ease of manufacture
If enzyme composition is simplified for ease of manufacture, then fabrication becomes easier, but detection sensitivity and accuracy decrease
Solution Approach 1:
The patent divides the enzyme composition into distinct functional segments: 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 optimized independently while maintaining overall system performance, balancing ease of manufacture with detection accuracy
Solution Approach 2:
The patent optimizes parameters including enzyme concentrations, ratios of different enzyme components, and electron transfer agent composition to achieve optimal performance. By carefully controlling these parameters, the system attains high measurement precision while maintaining practical manufacturability through standardized preparation protocols
3Speed
If rapid detection is achieved within 30 seconds, then response time is improved, but measurement stability and accuracy may be compromised
Solution Approach 1:
The patent incorporates NAD(P)H oxidoreductase and electron transfer agent in advance within the enzyme composition, pre-positioning the electron transfer pathway. This preliminary arrangement eliminates the need for separate incubation or activation steps, enabling rapid 30-second detection while maintaining measurement stability through the pre-established coupled reaction system
Solution Approach 2:
The coupled enzyme system maintains continuous useful action through the regenerative cycle where NAD(P)H oxidoreductase continuously regenerates NAD(P)+ from NAD(P)H, and the electron transfer agent continuously mediates electron flow. This continuous operation ensures both rapid response and stable, accurate measurements over time
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 rapid, linear, and stable analyte detection within 30 seconds, suitable for in vivo monitoring with high sensitivity and accuracy, as demonstrated by Clark error grid analysis and MARD analysis.
Implementation Method 1
NAD(P)+ is a coenzyme found in all living cells. There are many biological molecules that are oxidized by NAD(P)+-dependent dehydrogenases. For example, glucose can be oxidized by NAD-dependent glucose dehydrogenase
Implementation Method 2
an NAD(P)+-dependent dehydrogenase, an NAD(P)H oxidoreductase and an electron transfer agent having a transition metal complex
Implementation Method 3
an electron transfer agent having a transition metal complex
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.