Portable Lipid Bilayer Sensor with Pretreated Aperture Membrane
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Solution Overview
Problem
Existing sensor systems for single molecule detection using lipid bilayers are cumbersome, require high user skill, and are not suitable for portable, real-time applications outside laboratory settings, such as point-of-care testing or field-based monitoring.
Innovation Solution
A portable sensor system comprising a cell and a hand-held electrical reader unit with a septum having a membrane with an aperture for forming a lipid bilayer, where the aperture is 20µm or less in diameter, and a pretreated membrane for increased affinity, allowing for easy bilayer formation and robustness, along with a gel to support the bilayer and reduce user skill requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laboratory equipment is used for lipid bilayer formation, then sensing capability is achieved, but device complexity and user skill requirement increase
Solution Approach 1:
The system is divided into separate functional modules: a disposable cell unit containing the aperture and membrane assembly, and a reusable reader unit. This segmentation allows the complex sensing function to be isolated in a simple, replaceable component, reducing overall system complexity for the user.
Solution Approach 2:
A pretreatment layer is applied to the membrane surface to facilitate lipid bilayer formation. This intermediary layer mediates between the membrane and lipids, making the bilayer formation process more reliable and less skill-dependent while maintaining sensing capability.
2Stability of the object's composition
If aperture diameter is reduced to 20µm or less, then bilayer stability increases, but manufacturing precision requirements increase
Solution Approach 1:
The aperture diameter is optimized to 20µm or less, changing the physical parameter to achieve better bilayer stability. The membrane pretreatment parameter is also modified to compensate for the smaller aperture, making bilayer formation more robust despite the tighter manufacturing tolerance.
3Ease of operation
If membrane pretreatment is applied to increase lipid affinity, then bilayer formation ease improves, but manufacturing complexity increases
Solution Approach 1:
The membrane is pretreated during manufacturing to pre-establish high lipid affinity. This preliminary action is performed once during production, allowing the device to be easily used by end-users without requiring them to perform complex pretreatment steps, thus improving ease of operation while containing manufacturing complexity in the production phase.
4Weight of moving object
If portable hand-held reader unit is used, then system portability improves, but measurement precision may worsen
Solution Approach 1:
The system replaces complex mechanical stabilization equipment with an optimized electrical measurement circuit in the portable reader unit. The circuit is designed to accurately measure electrical signals across the lipid bilayer without requiring bulky mechanical stabilization systems, enabling portability while maintaining measurement precision.
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 rapid, real-time, and sensitive single molecule detection in various settings with reduced user expertise and cost, as the system is more stable and easier to use, facilitating its application in non-laboratory environments.
Implementation Method 1
a lipid monolayer is carried on the water/air interface past either side of an aperture which is perpendicular to that interface... the solution/air interfaces are physically moved repeatedly up and down past either side of the aperture until a bilayer is formed
Implementation Method 2
Ionic conductivity between the two compartments is therefore re-established by insertion of transmembrane pores into the bilayer, creating ion conducting channels through the bilayer
Implementation Method 3
the test chamber has a depth between the septum and a closure sheet in the direction perpendicular to the septum selected such that when an aqueous test solution is introduced into the test chamber, an interface between the aqueous test solution and air in the test chamber across the depth of the test chamber is held by surface tension irrespective of the orientation of the cell
Data Source
AI summary
A sensor system (1) for measuring an electrical signal across a lipid bilayer is formed by a cell (2) and an electrical reader unit (3) which are connectable together. The cell (2) is capable of supporting a lipid bilayer across an aperture (11) in a membrane (10) and has a construction which is cheap to manufacture. The reader unit (3) is a portable device which monitors an electrical signal generated in the connected cell (2) to allow analysis of that electrical signal. The sensor system (1) is intended for use outside of a laboratory setting.