NAD(P)-Dependent Enzyme 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 β-hydroxybutyrate, necessitating improved enzyme compositions and sensors for clinical accuracy.
Innovation Solution
Enzyme compositions comprising 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 measurement of analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional enzyme sensors are used for measuring NAD(P)+-dependent analytes, then basic detection capability is provided, but stability and sensitivity are insufficient for clinically accurate measurements
Solution Approach 1:
The patent employs a composite enzyme system comprising multiple enzymes (NAD(P)+-dependent dehydrogenase, NAD(P)H oxidoreductase, and electron transfer agent) working in cascade. This composite enzymatic system enables clinically accurate measurements by combining the specific analytical function of dehydrogenases with the electron transfer capabilities of mediators, thereby resolving the contradiction between measurement precision and sensor stability.
Solution Approach 2:
The patent introduces electron transfer agents (mediators) such as transition metal complexes as intermediaries between the enzyme active sites and the electrode. These mediators facilitate efficient electron transfer while maintaining enzyme stability, thus improving both measurement accuracy and sensor reliability simultaneously.
2Reliability
If enzyme compositions are immobilized on electrodes using polymers and crosslinkers, then sensor stability is improved, but device complexity increases
Solution Approach 1:
The patent employs crosslinkers to pre-establish stable bonds between enzyme molecules and the polymer support matrix before electrode assembly. This preliminary crosslinking action ensures enzyme immobilization stability and prevents leaching during operation, thereby improving sensor reliability without requiring complex post-fabrication processing steps.
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 and linear signal output for analytes, achieving clinically accurate measurements within 30 seconds and maintaining stability over extended periods.
Implementation Method 1
NAD(P)+-dependent dehydrogenases
Implementation Method 2
glucose can be oxidized by NAD-dependent glucose dehydrogenase, alcohol can be oxidized by NAD-dependent alcohol dehydrogenase
Implementation Method 3
NAD(P)H oxidoreductase and an electron transfer agent having a transition metal complex
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
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.