Usnic Acid Topical Composition via Surfactant Solubilization
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Solution Overview
Problem
The poor water-solubility of usnic acid makes it difficult to formulate high-concentration water-based compositions for topical treatments of skin diseases, as it often requires the use of irritant organic solvents like ethanol and acetone, which are undesirable in pharmaceutical and cosmetic applications.
Innovation Solution
A topical composition comprising usnic acid solubilized with a mixture of ethoxylated hydrogenated castor oil derivatives, such as PEG-40 hydrogenated castor oil, and polypropylene glycol buteth, like PPG-26-buteth-26, which allows for the creation of stable, water-based formulations without irritant solvents, along with hyaluronic acid and other active principles like ketoconazole, to treat various skin conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If usnic acid is solubilized with organic solvents like ethanol, methanol, and acetone, then high concentration of usnic acid can be achieved, but skin irritation occurs and the composition becomes unacceptable for topical use
Solution Approach 1:
The patent uses ethoxylated hydrogenated castor oil derivatives and polypropylene glycol buteth as intermediary solubilizing agents. These compounds act as mediators between usnic acid and water, enabling high-concentration formulations without requiring irritant organic solvents. The solubilizing mixture has a specific HLB value range (10-16) that optimizes its ability to solubilize usnic acid while maintaining skin compatibility.
Solution Approach 2:
The patent changes the physical-chemical parameters of the formulation system by using solubilizing agents with specific HLB values (10-16) and molecular weight ranges. This parameter optimization allows usnic acid to be solubilized at high concentrations in water-based systems without the need for irritant solvents, fundamentally altering the formulation approach from organic-solvent-based to surfactant-based solubilization.
2Object-affected harmful factors
If water-based compositions are used to avoid irritant solvents, then skin compatibility is improved, but the solubility of usnic acid becomes insufficient for high-concentration formulations
Solution Approach 1:
The patent introduces ethoxylated hydrogenated castor oil derivatives and polypropylene glycol buteth as intermediary substances that bridge the solubility gap between water and usnic acid. These solubilizing agents enable water-based formulations to achieve high usnic acid concentrations by creating micellar structures that encapsulate the hydrophobic usnic acid molecules.
Solution Approach 2:
The patent creates a composite solubilizing system combining ethoxylated hydrogenated castor oil derivatives and polypropylene glycol buteth in specific ratios. This composite approach leverages the complementary properties of both components to achieve enhanced solubilization capacity, allowing high-concentration usnic acid formulations in water-based systems.
3Device complexity
If conventional solubilizing methods are used, then formulation simplicity is maintained, but the need for irritant solvents compromises product safety and efficacy
Solution Approach 1:
The patent replaces conventional organic solvent solubilization with a surfactant-based intermediary system. The ethoxylated hydrogenated castor oil derivatives and polypropylene glycol buteth serve as mediators that simplify the formulation by eliminating the need for multiple irritant solvents while maintaining effective usnic acid delivery.
Solution Approach 2:
The patent optimizes specific formulation parameters including the HLB value range (10-16) of the solubilizing mixture and the weight ratio components (0.5/1 to 1.5/1 for PEG-40 hydrogenated castor oil to polypropylene glycol-26-buteth-26). These parameter optimizations enable effective solubilization with a simplified, safer formulation system.
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 composition effectively treats skin diseases like psoriasis, dermatitis, and fungal infections by providing a stable, non-irritant, high-concentration usnic acid solution that reduces wounds and prevents plaque formation, demonstrating significant clinical efficacy and safety.
Implementation Method 1
usnic acid solubilized with a mixture of ethoxylated hydrogenated castor oil derivatives, such as PEG-40 hydrogenated castor oil, and polypropylene glycol buteth, like PPG-26-buteth-26, which allows for the creation of stable, water-based formulations
Data Source
AI summary
The present invention refers to new topical compositions comprising usnic acid. The invention also comprises the use of said compositions, possibly in association with other active principles, for the therapy of skin diseases, including eczemas, dermatitis, skin wounds of various origin, sores, burns, psoriasis, proliferative keratosis and skin diseases caused by microbial and fungal agents.