Glucose Oxidoreductase Reagent Layer Segmentation
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Solution Overview
Problem
Conventional electrochemical test strips for measuring blood glucose levels face challenges in reproducibly manufacturing reagents with consistent sensitivity due to their biological nature, leading to variability in electrochemical properties and increased susceptibility to manufacturing defects and handling damage as sample sizes become smaller.
Innovation Solution
A reagent layer comprising glucose oxidoreductase, flavin nucleoside coenzyme, or nicotinamide nucleotide coenzyme, and a mediator formulation with electroactive organic molecules such as phenoxazines or benzophenoxazinium salts, and coordination complexes like osmium or ruthenium complexes, which enhances sensitivity and stability, providing a linear relationship between measured current and glucose concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single layer of biological reagents is used over both working and counter electrodes, then manufacturing is simplified with only one deposition step, but sensitivity consistency and reproducibility deteriorate due to the biological nature of the reagents
Solution Approach 1:
The patent divides the single reagent layer into separate layers for the working electrode and counter electrode. The working electrode receives a first reagent layer containing glucose oxidase and mediator, while the counter electrode receives a second reagent layer with different composition. This segmentation allows each electrode to be optimized independently, improving sensitivity consistency while maintaining manufacturing simplicity through separate deposition steps.
2Volume of moving object
If sample size is reduced to enable miniaturization, then device portability and convenience are improved, but susceptibility to manufacturing defects and handling damage increases
Solution Approach 1:
The patent applies different reagent compositions to different locations (electrodes) within the test strip. The working electrode receives a specialized first reagent layer with glucose oxidase and mediator optimized for glucose detection, while the counter electrode receives a second reagent layer with different composition. This local optimization ensures that each component performs its function reliably even in miniaturized formats, reducing susceptibility to manufacturing defects.
3Reliability
If conventional mediators are used in the reagent layer, then electrochemical reactions occur, but electron transfer efficiency and measurement sensitivity are limited
Solution Approach 1:
The patent employs a composite mediator system consisting of multiple components: a first mediator (such as phenazine or phenoxazine derivatives) and a second mediator (such as viologen or metal complexes like ruthenium or osmium). This composite mediator formulation enhances electron transfer efficiency between the enzyme and electrode, significantly improving measurement sensitivity while maintaining reliable electrochemical reactions.
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 proposed reagent layer composition improves the accuracy, sensitivity, and stability of blood glucose measurements, ensuring reliable results even with smaller sample sizes by maintaining a consistent linear relationship between current and glucose concentration, thus addressing the challenges of manufacturing defects and handling issues.
Implementation Method 1
the reagents react with the glucose, and the meter applies a voltage to the electrodes to cause a redox reaction. The meter measures the resulting current
Implementation Method 2
The best reagent compositions are those that exhibit increased sensitivity by facilitating the free flow of electrons between the sample being analyzed and the electrode and its connected circuitry
Data Source
Figure 1
AI summary
Biological reagent compositions with improved sensitivity to the concentration of blood glucose in patient samples for use in measuring systems and methods. The reagent compositions comprise a glucose oxidoreductase enzyme, a flavin nucleoside coenzyme and a mediator formulation. The mediator formulation comprises at least one electroactive organic molecule and at least one coordination complex.