Biosensor Reagent Coating Composition for Consistent Analyte Detection
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Solution Overview
Problem
Current analytical sensors for bioanalytes face challenges in producing consistent and accurate test results, requiring improvements in reagent composition and coating methods to ensure reproducibility and economic manufacturing.
Innovation Solution
A reagent composition comprising a release polymer, an effective amount of an enzyme, an enzyme cofactor, and a redox compound, which can act as a redox mediator or couple in biosensors, is used to create a uniform coating on electrodes, utilizing polymers like polyvinyl alcohol-polyethylene glycol graft copolymer or polyvinyl acetate, with specific molecular weights and rheological properties for efficient analyte detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reagent compositions are used, then manufacturing is simpler, but test result consistency and accuracy deteriorate
Solution Approach 1:
The patent uses a composite reagent composition containing multiple polymers (first polymer with high glass transition temperature, second polymer with low glass transition temperature), enzymes, cofactors, and redox mediators. This composite approach enables consistent analyte detection while maintaining manufacturability through controlled material interactions and phase behavior.
Solution Approach 2:
The patent controls the glass transition temperatures of polymer components and their weight ratios to achieve desired reagent film properties. By adjusting these parameters, the composition maintains stability during manufacturing and storage while providing reproducible test results.
2Ease of manufacture
If soluble reagents are used for easy coating, then ease of manufacture improves, but wash-through during processing deteriorates
Solution Approach 1:
The patent creates a flexible reagent film that adheres to the test strip substrate. The polymer matrix forms a cohesive film structure that retains soluble reagents (enzymes, cofactors, redox mediators) while allowing the film itself to be flexible and conformable to the substrate geometry.
Solution Approach 2:
The patent uses polymers with different glass transition temperatures to create zones of different flexibility and adhesion within the reagent film. The first polymer provides structural integrity and adhesion to the substrate, while the second polymer provides flexibility and prevents cracking, together ensuring reagent retention during processing.
3Reliability
If reagent films are made durable for processing, then reliability improves, but flexibility during application deteriorates
Solution Approach 1:
The patent combines polymers with complementary properties: high glass transition temperature polymers provide thermal stability and adhesion for processing durability, while low glass transition temperature polymers provide flexibility and crack resistance. This composite approach achieves both durability and flexibility simultaneously.
Solution Approach 2:
The patent creates a reagent film with dynamic mechanical properties that adapt to different conditions. The polymer blend exhibits temperature-dependent behavior, being more flexible at application temperatures and more rigid at processing temperatures, thus achieving both flexibility and durability as needed.
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 solution enables the production of biosensors with consistent and accurate analyte detection, preventing wash-through of soluble reagents and ensuring durable, flexible films that maintain performance throughout processing and shelf life.
Implementation Method 1
The coating composition includes a release polymer that has dispersed within it an effective amount of an enzyme, an enzyme cofactor, and a redox compound. The release polymer controls the release rate of these soluble reagents.
Implementation Method 2
a redox compound capable of acting in a biosensor as (i) a redox mediator associated with a working electrode; (ii) a redox couple associated with a reference electrode; or (iii) the redox mediator associated with the working electrode and the redox couple for the reference electrode
Data Source
AI summary
The disclosure provides for reagent compositions for biosensors comprising release polymers, methods of making such biosensors and films of reagent compositions comprising release polymers. The reagent compositions comprise a release polymer and an effective analyte detecting amount of an enzyme an enzyme cofactor and a redox compound capable of acting in a biosensor as (i) a redox mediator associated with a working electrode (ii) a redox couple associated with a reference electrode or (iii) the redox mediator associated with the working electrode and the redox couple for the reference electrode.