Segmented Dosage Form for Poorly Soluble Weak Base Absorption
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Solution Overview
Problem
Conventional dosage forms for controlled release struggle with poorly soluble active ingredients, particularly weak bases, as they dissolve quickly in the acidic stomach environment but poorly in the intestinal environment due to pH-dependent solubility changes, leading to inefficient absorption.
Innovation Solution
The development of a dosage form comprising multiple active ingredient units with different release characteristics, where the first unit quickly releases the active ingredient in the stomach and subsequent units release in the intestinal sections, utilizing pH-resistant coatings and matrices to control the release, ensuring effective absorption of poorly soluble active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional controlled-release dosage forms are used for weak base active ingredients, then the active ingredient is rapidly absorbed in the stomach due to high solubility in acidic environment, but the dissolution rate becomes the limiting factor in the intestine due to poor solubility at higher pH
Solution Approach 1:
The dosage form is divided into multiple functional units: enteric-coated granules containing the weak base active ingredient, and separate acidifying agents. This segmentation allows the active ingredient to be protected from intestinal pH (maintaining solubility through enteric coating) while providing acidic microenvironment upon contact with acidifying agents to enhance dissolution and absorption.
Solution Approach 2:
Acidifying agents act as intermediaries that create a localized acidic environment in the intestine. These agents lower the pH in the intestinal lumen, converting the weak base active ingredient back to its protonated, water-soluble form, thereby enabling dissolution and absorption without requiring the active ingredient to be soluble at intestinal pH.
2Productivity
If the active ingredient is designed for rapid release in the stomach, then absorption efficiency is improved, but controlled release throughout the gastrointestinal tract cannot be achieved
Solution Approach 1:
The dosage form combines enteric-coated granules (designed for intestinal release) with rapidly dissolving acidifying agents. This creates a segmented release pattern where the acidifying agents act quickly to create acidic microenvironment, while the enteric-coated granules provide sustained release of the active ingredient throughout the intestinal tract.
Solution Approach 2:
The enteric coating provides localized protection and controlled release properties to the granules, while the acidifying agents create localized acidic microenvironments at specific sites in the intestine. This local quality modification enables both rapid initial action and prolonged sustained release in different gastrointestinal sections.
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 controlled and prolonged release of poorly soluble active ingredients, improving bioavailability by optimizing release phases in different gastrointestinal sections, thereby enhancing absorption efficiency.
Implementation Method 1
a coating polymer that is insoluble in gastric juice but that dissolves in the upper intestinal tract at a pH of at least 6
Implementation Method 2
The dissolution rate can be controlled, in particular, by selecting a matrix polymer that dissolves gradually in the gastrointestinal tract
Implementation Method 3
As the matrix dissolves, the active ingredient is released, dissolves in the surrounding fluid, and is absorbed
Implementation Method 4
Other concepts utilize osmotic systems, which control the release of the active ingredient using a membrane
Data Source
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AI summary
The invention relates to a dosage form, to a method for the production thereof, and to uses thereof. The dosage form comprises different units containing active ingredient, which units are intended to release an active ingredient in such a way that the intake of a traditional dosage form several times a day can be simulated. The dosage form can release several active ingredients.