Biosensor Permselective Membrane Prevents Immunoglobulin Permeation
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Solution Overview
Problem
Existing glucose sensors face challenges in maintaining accurate glucose monitoring due to enzyme deactivation and swelling of hydrogel matrices, leading to decreased operational life and analytical performance.
Innovation Solution
The development of optimized analyte sensors with a permselective membrane and porous matrices, including a biocompatible polymer composition and functionalized poly(dimethyl siloxane), which facilitates the sensing of glucose and lactate while preventing immunoglobulin permeation, and the use of immobilized enzymes like glucose oxidase on a porous substrate with enhanced surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel matrices are used to immobilize enzymes, then enzyme activity is maintained, but the matrices swell over time leading to decreased analytical performance
Solution Approach 1:
The patent employs porous matrices with controlled pore structures to immobilize enzymes. The porous structure provides adequate surface area for enzyme attachment while maintaining structural integrity. The pore size and distribution are optimized to prevent swelling while allowing analyte diffusion, thus maintaining both enzyme activity and compositional stability over time.
Solution Approach 2:
The patent uses composite materials combining hydrophilic polymers with crosslinking agents to create immobilization matrices. These composite structures provide the necessary mechanical stability to prevent swelling while maintaining the hydrophilic environment required for enzyme activity. The crosslinked network structure prevents excessive water uptake that would cause swelling.
2Measurement precision
If enzyme coatings are applied to electrodes, then glucose detection accuracy is improved, but enzyme deactivation occurs reducing operational life
Solution Approach 1:
The patent applies protective layers and stabilizing agents to enzyme coatings before deployment. These protective measures include incorporating antioxidants, protein stabilizers, and protective polymers that prevent enzyme deactivation from exposure to oxygen, pH changes, and mechanical stress, thereby extending operational life while maintaining detection accuracy.
Solution Approach 2:
The patent optimizes various parameters of the enzyme coating including thickness, crosslinking density, and composition ratios to balance enzyme activity and stability. By carefully controlling these parameters, the coating maintains high glucose detection accuracy while protecting enzymes from deactivation, thus extending sensor operational life.
3Reliability
If permselective membranes are used to prevent immunoglobulin permeation, then sensor reliability is improved, but membrane complexity increases
Solution Approach 1:
The patent designs permselective membranes that perform multiple functions: preventing immunoglobulin permeation, allowing glucose and oxygen diffusion, and providing mechanical support. By integrating these functions into a single membrane layer with optimized pore structure and material composition, the patent achieves high sensor reliability without proportionally increasing device complexity.
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 provides stable and accurate glucose monitoring with extended sensor life, improved material properties, and enhanced sensitivity, allowing for precise detection of analytes like glucose and lactate.
Implementation Method 1
a permselective membrane which facilitates the sensing of the analyte
Implementation Method 2
a biocompatible polymer composition that is impermeable to immunoglobulins, yet permeable to oxygen, glucose and lactate
Implementation Method 3
the reaction between glucose and oxygen that is catalyzed by glucose oxidase
Implementation Method 4
the reaction between glucose and oxygen that is catalyzed by glucose oxidase... the glucose reacts with oxygen to produce H2O2
Implementation Method 5
a porous matrix having a surface coated with an immobilized enzyme
Implementation Method 6
a porous matrix having a surface coated with an immobilized enzyme... a rigid macroporous polymer
Implementation Method 7
As glucose and oxygen diffuse into an immobilized enzyme layer on a sensor
Data Source
AI summary
Embodiments of the invention provide analyte sensors having optimized permselective membranes and methods for making and using such sensors. Embodiments of the invention also provide analyte sensors such as those having porous matrices coated with an analyte sensing composition and methods for making and using such sensors. Illustrative embodiments include electrochemical glucose sensors having glucose oxidase coatings.