Droplet Bilayer Membrane for Rapid Substance Permeability Screening
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Solution Overview
Problem
Current methods for determining a substance's ability to cross biological bilayer membranes are time-consuming and lack accuracy, hindering the development of drugs that need to traverse intestinal walls for oral administration.
Innovation Solution
A method involving droplets of aqueous solutions surrounded by amphiphilic molecules in a hydrophobic medium, where the contact angle between the droplets forms a bilayer mimicking biological membranes, allowing for rapid analysis of substance translocation using a solvent to separate and collect droplets for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PAMPA method is used to identify molecules able to cross biological bilayer membrane, then the method provides a screening capability, but the experimental time is long and the accuracy is low
Solution Approach 1:
The invention creates a simplified copy of the biological bilayer membrane using phospholipid monolayers on droplet interfaces. This artificial membrane model replicates the essential permeability properties of biological membranes without requiring complex cell cultures or long incubation periods, enabling rapid high-throughput screening while maintaining physiological relevance
Solution Approach 2:
The invention changes the physical parameters of the membrane model by using phospholipid monolayers at droplet interfaces instead of traditional PAMPA setups. This parameter change reduces the time required for molecules to traverse the membrane while maintaining the ability to screen for permeability, achieving both speed and accuracy
2Reliability
If vesicles are used to test molecule translocation, then the bilayer membrane structure is provided, but the vesicle recovery is difficult and the process is time-consuming
Solution Approach 1:
The invention segments the continuous vesicle system into discrete droplet units, each forming its own bilayer membrane at the interface. This segmentation allows individual droplets to be easily manipulated, separated, and analyzed without the complexity of recovering intact vesicles, dramatically reducing processing time while maintaining membrane integrity
Solution Approach 2:
The invention extracts the essential bilayer membrane function from the complex vesicle structure. By using phospholipid monolayers at droplet interfaces, the membrane-forming capability is isolated and simplified, eliminating the need for vesicle recovery steps while preserving the translocation assessment functionality
3Measurement precision
If Caco-2 cell layer technique is used, then the biological membrane crossing ability is accurately tested, but the cell culture process is complex and maintaining uniform healthy layers is difficult
Solution Approach 1:
The invention creates a simplified copy of the Caco-2 cell membrane function using phospholipid monolayers. This artificial membrane model replicates the permeability characteristics of intestinal epithelial cells without requiring living cell cultures, eliminating the complexity of maintaining cell health and uniformity while preserving accurate permeability assessment
Solution Approach 2:
The invention uses disposable phospholipid monolayer droplets that can be prepared, used, and discarded without the need for maintaining complex cell cultures. Each droplet provides a fresh, uniform membrane interface that eliminates the variability and maintenance issues associated with living Caco-2 cell layers
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 method significantly reduces experimental time to less than one hour while providing high accuracy in determining a substance's ability to cross biological bilayer membranes, facilitating drug development by identifying effective molecules for drug delivery.
Implementation Method 1
providing in a hydrophobic medium (1) a first droplet D1 of an aqueous solution AS1, wherein the droplet D1 is surrounded by a monolayer of amphiphilic molecules (2)
Implementation Method 2
putting the first droplet D1 and the second droplet D2 into contact so as to form a bilayer of amphiphilic molecules (2) in the contact area
Implementation Method 3
adding to the hydrophobic medium (1) a solvent capable of separating the droplets D1 and D2 put into contact
Data Source
AI summary
The present invention relates to a method to analyse the ability of a substance (3) to cross a bilayer membrane comprising the following steps: (i) providing in a hydrophobic medium (1) a first droplet D1 of an aqueous solution AS1, wherein the droplet D1 is surrounded by a monolayer of amphiphilic molecules (2), (ii) providing in the said hydrophobic medium (1) a second droplet D2 of an aqueous solution AS2 containing the substance (3) to be analysed, wherein the droplet D2 is surrounded by a monolayer of amphiphilic molecules (2), (iii) putting the first droplet D1 and the second droplet D2 into contact so as to form a bilayer of amphiphilic molecules (2) in the contact area and to have a contact angle 2θ between the two droplets D1 and D2 comprised between 10° and 180°, (iv) adding to the hydrophobic medium (1) a solvent capable of separating the droplets D1 and D2 put into contact, (v) collecting the droplet D1, and (vi) analysing the content of the droplet D1 in order to determine the presence or not of the substance (3).