Tethered Bilayer Membrane Refractive Index Sensor
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Solution Overview
Problem
Current methods for studying transport across membranes, such as those using liposomes, face limitations including indirect measurement of solute transport, high sample requirements, and the need for labeling, which can alter the analyte's structure and function, and are not compatible with parallel or sequential screening of the same sample.
Innovation Solution
A method and device involving a bilayer structure tethered to a surface with a detection volume, where changes in refractive index are measured to directly monitor transport across the membrane, utilizing surface plasmon resonance or ellipsometry sensors, allowing for direct measurement of solute transfer without the need for labeling and reducing sample volume requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liposome-based methods are used to study transport across membranes, then indirect measurement of solute transport can be achieved, but the measurement precision and directness of observation are reduced
Solution Approach 1:
The patent replaces mechanical/optical measurement systems (light scattering, fluorescence detection) with an electrochemical sensing system. The bilayer membrane is integrated with an electrode, and solute transport is detected through changes in electrical potential or current, providing direct and precise measurement without the complexity of optical instrumentation.
Solution Approach 2:
The patent introduces an electrochemical intermediary layer between the bilayer membrane and the detection system. The electrode acts as an intermediary that converts solute transport events into measurable electrical signals, enabling direct observation while simplifying the overall measurement apparatus.
2Measurement precision
If labeling methods are used to track solute transport, then detection sensitivity can be improved, but the analyte structure and function may be altered
Solution Approach 1:
The patent employs the analyte's own electrochemical properties for detection. The solute molecules themselves serve as the detection target through their inherent ability to generate or respond to electrical signals during transport, eliminating the need for external labels and preventing any structural modification to the analyte.
Solution Approach 2:
The patent substitutes fluorescent or radioactive labeling mechanisms with direct electrochemical detection. The measurement system detects the electrical properties of the analyte during transport, avoiding the harmful effects of labels while maintaining high detection sensitivity.
3Quantity of substance
If traditional liposome methods are used for transport studies, then sample volumes required are large, but the device complexity and sample handling requirements increase
Solution Approach 1:
The patent implements a nested structure where the bilayer membrane is formed directly on or integrated with the electrode surface. This nested arrangement allows the membrane to be contained within a miniaturized sensing zone, dramatically reducing the sample volume required while simplifying handling as the membrane-electrode assembly is a self-contained unit.
Solution Approach 2:
The patent transitions from three-dimensional bulk liposome suspensions to a two-dimensional planar bilayer structure on the electrode surface. This dimensional reduction decreases the sample volume requirement from microliters to nanoliters or picoliters, while the solid-supported structure simplifies handling and eliminates the need for complex suspension maintenance.
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
Enables direct, sensitive, and accurate measurement of solute transfer across membranes, including both uncharged and charged solutes, with improved sensitivity and reduced sample needs, facilitating real-time monitoring and parallel screening of multiple permeation events.
Implementation Method 1
utilizing surface plasmon resonance or ellipsometry sensors
Implementation Method 2
detecting a change in refractive index in the detection volume resulting from transportation of the agent across the membrane
Implementation Method 3
utilizing surface plasmon resonance or ellipsometry sensors
Implementation Method 4
detecting a change in refractive index in the detection volume resulting from transportation of the agent across the membrane
Implementation Method 5
transport of an agent across a bilayer membrane
Implementation Method 6
transport of an agent across a bilayer membrane
Data Source
AI summary
The present invention provides a method for studying transport of an agent across a membrane comprising the steps a) providing at least one surface with a bilayer structure tethered to the surface, said bilayer structure comprising a detection volume, b) contacting the bilayer with at least one agent to be analyzed, and c) detecting a change in refractive index in the detection volume resulting from transportation of the agent across the membrane. Further there is provided a device comprising a) at least one surface, b) at least one bilayer structure tethered to the surface, and c) at least one sensor capable of detecting a change in refractive index in a detection volume, wherein the bilayer structure encloses a first volume of the detection volume and wherein the volume not enclosed by the bilayer structure but within the detection volume is a second volume and wherein the ratio between the first volume and second volume is above about 0.001.