Multiwell Lipophilicity Assay Using Membrane-Based Phase Separation
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Solution Overview
Problem
Existing methods for determining lipophilicity of compounds are time-consuming and inefficient, particularly for low-soluble compounds, and require lengthy incubation times and solvent separation processes.
Innovation Solution
A method using a multiwell plate with a lipophilic membrane and a liquid-tight barrier, where a non-polar solvent is added to the membrane, followed by an aqueous solution containing the test compound, allowing for direct determination of the compound's quantity after distribution equilibrium is reached, without the need for solvent separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional shake-flask method is used to determine lipophilicity, then accurate measurement can be achieved, but the determination time becomes very long (only 2-5 compounds per day)
Solution Approach 1:
The invention segments the lipophilicity determination process into multiple independent parallel measurements using a multiwell plate with 96 wells, allowing simultaneous determination of multiple compounds rather than sequential processing in the conventional shake-flask method
Solution Approach 2:
The invention introduces a lipophilic membrane as an intermediary carrier that holds the non-polar solvent and facilitates phase separation, enabling direct measurement without manual solvent removal and extraction steps
2Measurement precision
If the assay system is incubated for 12 hours to reach distribution equilibrium, then accurate lipophilicity values can be obtained, but the determination time becomes excessively long
Solution Approach 1:
The invention applies preliminary action by pre-coating the lipophilic membrane with non-polar solvent before adding the aqueous solution, creating optimized contact surfaces that accelerate the reaching of distribution equilibrium from 12 hours to approximately 2 hours
Solution Approach 2:
The invention transitions from bulk liquid-liquid extraction to a membrane-based interfacial system, creating a large surface area contact between phases that dramatically speeds up the equilibrium process while maintaining measurement accuracy
3Measurement precision
If solvent removal is required after the assay to measure compound concentration, then accurate measurement can be achieved, but the procedure becomes complex and time-consuming
Solution Approach 1:
The invention extracts the solvent removal step from the assay procedure by using a membrane system where the non-polar solvent remains bound to the membrane, automatically separating it from the aqueous phase where the compound concentration is measured, eliminating the need for manual solvent removal
Solution Approach 2:
The membrane system performs self-service by automatically maintaining phase separation and preventing solvent mixing, eliminating the need for manual intervention in solvent removal and simplifying the overall procedure
4Measurement precision
If conventional methods are used to determine lipophilicity of low soluble compounds, then measurement can be performed, but the results are unreliable and the process is inefficient
Solution Approach 1:
The invention applies local quality by using a lipophilic membrane with specific surface properties that selectively interact with low soluble compounds, providing a localized environment optimized for their partitioning behavior and enabling reliable measurement that conventional bulk methods cannot achieve
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
The method significantly reduces determination time to 1.5 hours from 12 hours, facilitates easy handling, and accurately measures lipophilicity across a broad range, including low-soluble compounds, with improved exchange surface area for faster equilibrium.
Implementation Method 1
providing a multiwell plate, wherein the wells comprise at the bottom a lipophilic membrane
Implementation Method 2
determining the quantity of the test compound in the aqueous solution after a distribution equilibrium has been reached
Implementation Method 3
the bottom of the multiwell plate comprises a liquid tight barrier to seal the wells and to produce a liquid tight bottom of the multiwell plate
Implementation Method 4
Lipophilicity is expressed either by log P (octanol-water Partition coefficient for neutral species) or log D (octanol-water Distribution coefficient for charged molecules)
Data Source
Figure 1~3
Figure 4
AI summary
The present invention relates to a method for determining the lipophilicity of a test compound comprising the steps of: a) providing a multiwell plate, wherein the wells comprise at the bottom a lipophilic membrane and the bottom of the multiwell plate comprises a liquid tight barrier to produce a liquid tight bottom of the multiwell plate, b) adding a non-polar solvent to the lipophilic membranes in the wells of step a), c) adding an aqueous solution comprising the test compound to the wells of step b, and d) determining the quantity of the test compound in the aqueous solution after a distributionequilibrium has been reached.