Amphiphilic Sensor Well Array for High-Resistance Single-Molecule Sensing
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Solution Overview
Problem
Existing methods for forming amphiphilic layers in biosensors face challenges such as low resistance, small ionic reservoirs, and instability, making them unsuitable for high-fidelity single molecule sensing and difficult to scale up for commercial applications.
Innovation Solution
The apparatus and method involve a surface with an array of sensor wells and flow control wells, along with a pre-treatment coating, to ensure uniform distribution and high resistance seals, using surface patterning to control wetting characteristics and prevent pre-treatment migration during fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional supported amphiphilic layer approach is used, then the layer can be formed to separate two volumes of aqueous solution, but the resistance is only about 100 MΩ which is not sufficient for single molecule sensing requiring at least 1 GΩ
Solution Approach 1:
The invention divides the continuous amphiphilic layer into multiple discrete segments or domains within the support structure. This segmentation creates multiple isolated compartments that each form high-resistance seals, and the cumulative effect achieves the required >1 GΩ total resistance while maintaining structural stability and ease of formation through modular assembly.
Solution Approach 2:
The invention transitions from forming a single two-dimensional amphiphilic layer to creating a three-dimensional structured support with multiple layers, compartments, or stacked domains. This dimensional change allows the system to achieve higher effective resistance through series configuration of multiple resistance elements while providing mechanical stability.
2Duration of action of stationary object
If the distance between amphiphilic layer and solid support is kept small (typically 1 nm), then the layer can be maintained, but the small volume does not contain many ions limiting the duration for which recording can be performed
Solution Approach 1:
The invention implements a nested structure where amphiphilic layers are positioned within recesses or cavities of the support structure, creating hierarchical compartments. This nesting allows the amphiphilic layer to maintain close proximity to the support for stability while the recess geometry provides an expanded ionic reservoir volume that extends recording duration without compromising layer integrity.
Solution Approach 2:
The invention extends the system from a single-plane configuration to a multi-level three-dimensional structure with vertical stacking or layered compartments. This dimensional expansion increases the available ionic reservoir volume while maintaining the necessary close proximity between amphiphilic layers and support structures through vertical arrangement.
3Reliability
If standard systems for folded lipid bilayers or painted lipid bilayers are miniaturized, then the device size is reduced, but the resistance remains insufficient for high-fidelity single molecule sensing
Solution Approach 1:
The invention segments the sensing device into multiple independent high-resistance units or modules, each contributing to the total resistance. This segmentation allows miniaturization of individual units while achieving cumulative high resistance (>1 GΩ) across the array, enabling portable devices with single-molecule sensing capability.
Solution Approach 2:
The invention changes key physical parameters of the amphiphilic layer system, including thickness, composition, and structural configuration, to achieve higher electrical resistance. By optimizing these parameters in miniaturized devices, the invention achieves >1 GΩ resistance in compact form factors suitable for portable applications.
4Adaptability or versatility
If a plurality of addressable sensors are created, then the sensor array capability is improved, but the complexity of forming multiple high-resistance seals increases
Solution Approach 1:
The invention divides the sensor array into multiple independent modular units, each with its own amphiphilic layer and high-resistance seal. This segmentation allows parallel formation of multiple seals using standardized procedures, reducing overall complexity compared to forming a single large complex seal, while enabling addressable sensor arrays.
Solution Approach 2:
The invention creates a universal support structure and amphiphilic layer formation methodology that can be applied across multiple sensor positions. This universal approach allows the same formation process to create multiple high-resistance seals simultaneously or sequentially, enabling scalable sensor arrays without proportionally increasing formation 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
This approach enables the formation of high-quality amphiphilic layers with resistances greater than 1 GΩ, enhancing the stability and scalability of biosensors for single molecule sensing.
Implementation Method 1
using surface patterning to control wetting characteristics and prevent pre-treatment migration during fluid flow
Implementation Method 2
The amphiphilic layer resists the flow of current between the volumes when a potential difference is applied between the two volumes
Implementation Method 3
A membrane penetrating protein is inserted into the amphiphilic layer to allow the passage of ions across the layer, which is recorded as an electrical signal
Data Source
AI summary
An apparatus for supporting an array of layers of amphiphilic molecules, the apparatus comprising: a body, formed in a surface of the body, an array of sensor wells capable of supporting a layer of amphiphilic molecules across the sensor wells, the sensor wells each containing an electrode for connection to an electrical circuit, and formed in the surface of the body between the sensor wells, flow control wells capable of smoothing the flow of a fluid across the surface.