Dual-Enzyme Analyte Sensor Membranes for In Vivo Sensitivity
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Solution Overview
Problem
Existing analyte sensors for in vivo monitoring, particularly those detecting analytes other than glucose, suffer from poor sensitivity and lack refinement, making them inadequate for continuous and accurate monitoring of physiological conditions.
Innovation Solution
The development of analyte sensors with a dual enzyme system, including a glucose-responsive enzyme and an NAD-dependent reductase specific for the target analyte, coupled with mass transport limiting membranes, enhances sensitivity and accuracy in detecting analytes like ketones and acetoacetate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzyme-based amperometric sensors are used for detecting analytes other than glucose in vivo, then the sensors can provide continuous monitoring capability, but the sensitivity is poor and the detection accuracy is insufficient
Solution Approach 1:
The patent employs a composite membrane structure comprising a mass transport limiting membrane and an ion-selective membrane in combination. This composite material approach creates a multi-functional barrier that enhances analyte detection sensitivity while maintaining continuous monitoring capability. The mass transport limiting membrane controls analyte flux, and the ion-selective membrane provides selective ion transport, together resolving the contradiction between continuous monitoring and detection sensitivity.
Solution Approach 2:
The patent applies different functional properties to different regions of the sensor membrane system. The mass transport limiting membrane has specific pore structures optimized for controlling analyte transport, while the ion-selective membrane has properties optimized for selective ion detection. This local differentiation of membrane qualities enables enhanced sensitivity for specific analytes while maintaining overall continuous monitoring function.
2Duration of action of moving object
If implanted sensors remain in tissue for extended periods, then continuous analyte data can be collected, but biocompatibility and material stability become critical challenges
Solution Approach 1:
The patent uses composite membrane materials that combine biocompatible polymers with functional detection layers. The mass transport limiting membrane is constructed from biocompatible materials that minimize tissue rejection while maintaining their structural and functional properties over extended implantation periods. This composite approach resolves the contradiction between long-term implantation duration and biocompatibility.
3Measurement precision
If mass transport limiting membranes are used to improve analyte detection, then sensitivity increases, but oxygen reduction interference may occur
Solution Approach 1:
The patent introduces an ion-selective membrane as an intermediary layer between the mass transport limiting membrane and the electrode. This intermediary membrane selectively permits ion transport while blocking or reducing oxygen interference. The ion-selective membrane acts as a mediator that allows analyte detection to proceed with reduced oxygen reduction interference, resolving the contradiction between sensitivity enhancement and harmful factor reduction.
Solution Approach 2:
The patent effectively extracts or removes oxygen interference from the detection system by using the ion-selective membrane to selectively block oxygen transport while permitting analyte ion transport. This extraction of the harmful oxygen component from the system allows the mass transport limiting membrane to function at full sensitivity without the detrimental effect of oxygen reduction.
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 dual enzyme system with mass transport limiting membranes improves the sensitivity and accuracy of in vivo analyte detection, enabling effective monitoring of physiological conditions and reducing interference from oxygen reduction.
Implementation Method 1
a mass transport limiting membrane permeable to glucose and the analyte, wherein the mass transport limiting membrane overcoats at least the first active area
Implementation Method 2
the first active area includes a first enzyme system disposed upon a surface of the first working electrode and a second enzyme system disposed upon the first enzyme system
Implementation Method 3
an NAD-dependent reductase specific for the analyte
Data Source
AI summary
The present disclosure provides an analyte sensor for use in detecting various analytes. In certain embodiments, an analyte-responsive active area of a presently disclosed analyte sensor includes two or more enzyme systems for detecting the analyte. The present disclosure further provides methods for detecting various analytes using the disclosed analyte sensors.