Flux Function Assessment for Low Solubility Compounds
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Solution Overview
Problem
Current methods for assessing the absorption properties of low solubility compounds are inaccurate and time-consuming, particularly in predicting the effects of pH and excipients, due to challenges in measuring solubility and permeability, and require animal experiments, which are ethically controversial and costly.
Innovation Solution
A method involving a flux function assessment using a two-chamber system with a lipid membrane, where the effect of excipients and pH on low solubility compounds is evaluated by measuring concentration changes over time, allowing for rapid, cost-effective, and ethically acceptable prediction of absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional solubility measurement methods are used, then measurement can be performed, but accuracy is poor and time consumption is high
Solution Approach 1:
The patent replaces traditional mechanical/nephelometry-based solubility measurement methods with a flux-based measurement approach. By measuring the flux of compound through a membrane and applying Fick's laws, the system calculates solubility indirectly, achieving both higher accuracy and faster results without the time-consuming nephelometry steps.
Solution Approach 2:
The patent introduces a membrane as an intermediary element between the test compound and the measurement system. The membrane enables flux-based measurement, which serves as a mediator to derive solubility information more accurately and rapidly than direct measurement methods.
2Reliability
If animal experiments are used to assess absorption properties, then comprehensive data can be obtained, but cost increases and ethical issues arise
Solution Approach 1:
The patent creates an in vitro copy of the intestinal absorption process using a membrane system that mimics biological membrane properties. This artificial model reproduces absorption behavior without requiring live animals, providing reliable prediction data at lower cost and without ethical concerns.
Solution Approach 2:
The patent extracts the essential absorption function from the complex biological system by isolating the membrane transport mechanism. This extraction allows measurement of absorption properties in a simplified, controlled in vitro setting, eliminating the need for whole animal systems while retaining predictive reliability.
3Adaptability or versatility
If pH partition hypothesis is applied to predict absorption, then theoretical framework is available, but prediction accuracy fails for low solubility compounds
Solution Approach 1:
The patent moves beyond the simplified pH partition hypothesis by incorporating additional parameters including flux measurements, membrane permeability coefficients, and solubility data. This multi-parameter approach adapts the theoretical framework to accurately predict absorption for low solubility compounds where the simple pH partition model fails.
Solution Approach 2:
The patent creates a composite prediction model that integrates multiple theoretical components: Fick's diffusion laws, membrane transport theory, pH-dependent solubility relationships, and permeability coefficients. This composite approach combines various theoretical elements to achieve accurate predictions for complex low solubility compounds.
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 provides a fast, accurate, and cost-effective evaluation of excipient effects on absorption properties, reducing the need for animal experiments and improving the prediction of absorption processes for low solubility compounds, while considering pH-related effects.
Implementation Method 1
providing the calibration donor solution into a first donor chamber being separated from a first receiver chamber by a barrier, providing the donor solution into a second donor chamber being separated from a second receiver chamber by the barrier
Implementation Method 2
Fick's laws of diffusion underlie all of these models
Data Source
Figure 1~2
Figure 3(a)~3(h)
Figure 4(a)~4(f)
AI summary
The invention deals with a method for the assessment of the effect of excipients, pH and combinations thereof on the predicted absorption properties of low solubility compounds, comprising the step of assessing a change in a flux function for a combination of a low solubility compound and an excipient at at least one predefined pH value. The method allows a fast, accurate, and economic evaluation of an excipient being capable of optimizing the absorption of drug molecules, i.e. low solubility compounds. Furthermore, animal experiments can be excluded and use of compounds can be reduced in such evaluation. Thus, screening for future formulation efficacy (pH and excipient effects on solubility and permeability) of drug candidates can be justified, since the method is fast, compound-sparing, cost-effective, and reasonably accurate.