Analyte Transporting Membranes for Sensor Selectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrochemical analyte sensors face interference from electroactive species in the environment, leading to spurious signals due to overlapping oxidation or reduction potentials with the analyte or its by-products, which complicates accurate glucose monitoring in diabetes management.
Innovation Solution
The development of analyte sensors with a phospholipid bilayer membrane and chemically selective transporter molecules, such as GLUT-1, that facilitate glucose transport while inhibiting the diffusion of interfering molecules like ascorbate and acetaminophen, thereby enhancing selectivity and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemical sensors are used to detect analytes, then the sensor can generate signals from the analyte, but interfering species with overlapping oxidation or reduction potentials cause spurious signals that reduce measurement accuracy
Solution Approach 1:
The patent introduces a phospholipid bilayer membrane as an intermediary layer between the electrochemical sensor and the analyte environment. This membrane contains chemically selective transporter molecules that mediate the interaction by facilitating analyte transport while blocking interfering species, thus resolving the contradiction between signal generation and interference rejection
Solution Approach 2:
The patent applies local quality by creating a selectively permeable interface with different transport properties for different molecules. The phospholipid bilayer with specific transporter molecules provides localized selectivity at the membrane level, allowing analytes to pass while blocking interferents based on their chemical characteristics
2Measurement precision
If the sensor membrane is made highly selective to block interfering molecules, then measurement accuracy improves, but analyte migration through the sensor elements may be hindered
Solution Approach 1:
The chemically selective transporter molecules embedded in the phospholipid bilayer act as intermediaries that facilitate analyte transport while maintaining selectivity. These transporters enable efficient analyte migration through the membrane without compromising the blocking function against interfering species
Solution Approach 2:
The patent uses a composite membrane structure combining phospholipid bilayer with chemically selective transporter molecules. This composite material provides both the barrier function to block interferents and the transport function to facilitate analyte migration, resolving the contradiction between selectivity and productivity
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
This approach effectively reduces interference from non-target species, improving the accuracy of glucose monitoring by selectively allowing glucose to reach the sensor while blocking other electroactive compounds, thus enhancing sensor sensitivity and wear time.
Implementation Method 1
the analyte transporting layer comprises at least one protein selected facilitate transport of the analyte (e.g., GLUT-1) from an environment in which the sensor is disposed to the enzyme
Implementation Method 2
the analyte transporting layer inhibits the diffusion of at least one of acetaminophen, ascorbate, m-cresol, phenol, glycerol and urate therethrough
Implementation Method 3
the analyte sensing layer comprises an enzyme selected to react with an analyte (e.g., glucose oxidase)
Data Source
AI summary
Embodiments of the invention provide amperometric analyte sensors having membranes made from materials selected to transport analytes such as glucose to an enzyme within the sensor while simultaneously inhibiting the movement of interfering species such as acetaminophen to the electrode within the sensor. While embodiments of the invention can be used in a variety of contexts, typical embodiments of the invention include glucose or ketone sensors used in the management of diabetes.