Two-Compartment Dissolution Apparatus with Lipophilic Membrane
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Solution Overview
Problem
Existing methods for testing the dissolution of poorly soluble active pharmaceutical ingredients (APIs) fail to accurately predict in vivo performance, often requiring extensive and costly pharmacokinetic trials and using excessive amounts of in vivo relevant additives and media.
Innovation Solution
A two-compartment apparatus with a membrane impregnated with a lipophilic phase, where the membrane is permeable to dissolved API but impermeable to undissolved API, simulating intestinal conditions by allowing diffusion and mimicking the wash away of API by intestinal blood flow, using minimal testing media and allowing for reliable prediction of in vivo dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dissolution testing methods (paddle apparatus, flow through cell) are used, then dissolution rate can be measured, but they fail to accurately predict in vivo performance for poorly soluble APIs
Solution Approach 1:
A membrane impregnated with lipophilic phase is introduced as an intermediary between the donor compartment (containing API) and acceptor compartment (simulating intestinal blood). This membrane acts as a mediator that selectively allows dissolved API to pass through while retaining undissolved particles, thereby simulating the intestinal absorption barrier and enabling accurate prediction of in vivo performance.
Solution Approach 2:
The invention changes the physical-chemical parameters of the testing system by introducing a lipophilic phase into the membrane structure. This modification creates a selective barrier with specific permeability characteristics that mimic intestinal absorption, transforming the dissolution test from a simple dissolution measurement into a predictive in vitro-in vivo correlation model.
2Measurement precision
If extensive pharmacokinetic trials on human volunteers are conducted to evaluate formulation differences, then accurate in vivo data can be obtained, but the process becomes time-consuming and costly
Solution Approach 1:
The invention creates an in vitro copy of the in vivo intestinal absorption process by using a membrane system that replicates the selective permeability of intestinal barriers. This artificial model copies the essential features of biological absorption without requiring actual human trials, thereby providing accurate predictions in a fraction of the time and at reduced cost.
3Measurement precision
If conventional dissolution testing is performed, then dissolution rate can be determined, but excessive amounts of in vivo relevant additives and media are required
Solution Approach 1:
The testing system is segmented into two distinct compartments (donor and acceptor) separated by a functional membrane. This segmentation allows the test to be performed with minimal media volumes in each compartment while maintaining the necessary physiological conditions, thereby reducing the total quantity of expensive in vivo relevant additives required compared to conventional single-chamber systems.
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 provides a reliable and cost-effective method for predicting in vivo API dissolution with minimal media requirements, reducing costs and improving the accuracy of in vitro-in vivo correlations, even for APIs with poor solubility, by simulating realistic physiological conditions effectively.
Implementation Method 1
the membrane is permeable to a dissolved state but impermeable to an undissolved state of said active pharmaceutical ingredient
Implementation Method 2
a membrane impregnated with a lipophilic phase, wherein the membrane is permeable to a dissolved state but impermeable to an undissolved state
Data Source
Figure 1
AI summary
The present invention relates to a concept for testing dissolution of an active pharmaceutical ingredient wherein two compartments separated by a membrane impregnated with a lipophilic phase are provided. The membrane is permeable to a dissolved state but impermeable to an undissolved state of said active pharmaceutical ingredient.