Fine Lipid Particle Dispersion Stabilization in Acidic Media
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Solution Overview
Problem
Solid lipids like ceramides in cosmetics are prone to crystallization, leading to instability and reduced effectiveness, especially in acidic skin conditions where common anionic surfactants lose surface activity.
Innovation Solution
A dispersion of fine lipid particles is created using sterols, ceramides, an anionic surfactant, and a water-soluble solvent, which stabilizes the particles with low crystallinity even in acidic conditions, ensuring effective skin application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid lipids like ceramides are used in cosmetics, then skin barrier function and moisturizing properties are improved, but the lipids crystallize and become unstable
Solution Approach 1:
The patent changes the physical-chemical parameters of the lipid system by controlling particle size to sub-micron levels (average diameter 0.1-20 μm) and adjusting the heat of fusion to specific ranges, thereby preventing crystallization while maintaining stability. This parameter transformation converts solid lipids from a crystalline state to a stable dispersed state.
Solution Approach 2:
The patent creates a composite dispersion system combining solid lipids (ceramides, cholesterol, fatty acids) with surfactants and other cosmetic ingredients. This composite approach allows the solid lipids to be stabilized in a dispersed state without crystallizing, resolving the contradiction between maintaining lipid functionality and preventing crystallization.
2Stability of the object's composition
If anionic surfactants are used to disperse solid lipids, then particle dispersion is improved, but surface activity is lost in acidic skin conditions
Solution Approach 1:
The patent uses surfactants as intermediary substances that mediate between the solid lipids and the aqueous environment. These surfactants form stable complexes with the lipids, maintaining dispersion stability and surface activity even in acidic conditions by acting as a protective intermediary layer.
Solution Approach 2:
The patent adjusts the pH parameter of the overall formulation to be within specific ranges (pH 3.5-8.0) that maintain both the stability of the lipid particles and the surface activity of the anionic surfactants. By controlling this critical parameter, the patent resolves the contradiction between dispersion stability and surfactant effectiveness in acidic conditions.
3Reliability
If lipid particles are made finer to improve skin penetration, then effectiveness is improved, but manufacturing precision and stability become more difficult to control
Solution Approach 1:
The patent establishes specific parameter ranges for particle size (average diameter 0.1-20 μm) and heat of fusion that optimize both skin penetration effectiveness and manufacturing controllability. By defining these precise parameters, the patent enables consistent production of fine lipid particles with desired performance characteristics.
Solution Approach 2:
The patent applies different quality characteristics to different aspects of the lipid particles: fine particle size for skin penetration effectiveness, while maintaining controlled heat of fusion and composition for manufacturing stability. This local optimization of different properties resolves the contradiction between effectiveness and manufacturability.
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 dispersion maintains stability and effectiveness of ceramides on the skin, improving skin barrier function and moisturizing properties while maintaining a pH close to the skin's natural acidity.
Implementation Method 1
an anionic surfactant
Implementation Method 2
a water-soluble solvent
Data Source
AI summary
To provide a composition in which fine particles of solid lipid such as ceramides are emulsified and dispersed in a stable manner without being crystalized. A dispersion of fine lipid particles containing the following components (A) to (E), wherein the dispersion has a pH of 3.5 or more and 8.0 or less and the fine lipid particles have a heat of fusion of 0.30 J/g or less in a temperature range of 45° C. or more and 80° C. or less and an average particle size of less than 200 nm. (A) one or more selected from the group consisting of a sterol and a derivative thereof, (B) a lipid other than the component (A), the lipid being solid or semi-solid at 25° C., (C) an anionic surfactant, (D) a water-soluble solvent and (E) water.