Vesicle Composition Stability with Anionic Surfactants
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Solution Overview
Problem
Vesicles formed with silicone-based surfactants in cosmetic compositions are prone to damage during storage, leading to leakage of oily content and instability when a high concentration of water-soluble medicinal agents like tranexamic acid is used, resulting in white turbidity issues.
Innovation Solution
A vesicle-containing composition is developed that includes a silicone-based surfactant, a predetermined anionic surfactant such as polyoxyethylene alkyl ether phosphate or acyl methyl taurate, a polar oil or silicone oil, and a water-soluble medicinal agent, where the anionic surfactant attaches to the vesicle surface and the polar oil or silicone oil is within the bilayer membrane, maintaining stability even with high concentrations of water-soluble agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a high concentration of water-soluble medicinal agent is blended in the vesicle-containing composition, then the medicinal efficacy is improved, but the vesicle stability deteriorates and white turbidity occurs
Solution Approach 1:
A nonionic surfactant is introduced as an intermediary substance between the water-soluble medicinal agent and the vesicle structure. The nonionic surfactant concentrates at the interface and reduces the adverse interaction between the medicinal agent and vesicle membrane, thereby preventing vesicle damage while allowing high concentrations of medicinal agent to be incorporated
Solution Approach 2:
The composition uses a composite surfactant system combining silicone-based surfactant (for vesicle formation), anionic surfactant (for enhanced stability), and nonionic surfactant (for interface protection). This multi-component surfactant composite provides synergistic effects that maintain vesicle integrity even at high medicinal agent concentrations
2Ease of manufacture
If a silicone-based surfactant is used to form vesicles, then the ease of vesicle formation is improved, but the storage stability and fragrance retention worsen
Solution Approach 1:
Multiple surfactant types (silicone-based, anionic, and nonionic) are combined in a single vesicle system. The silicone-based surfactant provides easy vesicle formation, while the anionic and nonionic surfactants contribute to storage stability and fragrance retention, achieving a synergistic effect that overcomes the limitations of individual surfactants
Solution Approach 2:
The vesicle membrane is constructed from a composite of multiple surfactant molecules with different properties. This composite structure combines the advantageous properties of each surfactant type: ease of formation from silicone-based surfactant, stability from anionic surfactant, and interface protection from nonionic surfactant
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 achieves excellent stability and allows for the effective incorporation of water-soluble medicinal agents in cosmetics, preventing turbidity and maintaining efficacy, even at high concentrations of tranexamic acid or other agents like potassium 4-methoxysalicylate and ethyl vitamin C.
Implementation Method 1
a vesicle-containing composition, comprising: (A) a silicone-based surfactant, (B) one or more anionic surfactants selected from polyoxyethylene alkyl (12 to 15) ether phosphate, acyl methyl taurate and acyl glutamate
Implementation Method 2
Of the amphipathic compounds having both hydrophilicity and hydrophobicity, compounds such as phospholipid are known to form a spherical endoplasmic reticulum composed of a bilayer membrane (lamellar layer) in an aqueous phase
Data Source
AI summary
Disclosed is a vesicle-containing composition which exhibits excellent stability in the presence of a water-soluble medical agent. Specifically disclosed is a vesicle-containing composition which is characterized by containing (A) a silicone surfactant, (B) 0.001-0.2% by mass of one or more anionic surfactants that are selected from among polyoxyethylene alkyl(12-15) ether phosphates, acylmethyl taurine salts and acylglutamates, (C) a polar oil and/or a silicone oil having an IOB of 0.05-0.80, and (D) water that contains a water-soluble medical agent in an amount of 0.5-5% by mass relative to the composition. The vesicle-containing composition is also characterized in that: (A) the silicone surfactant forms vesicles; (B) the anionic surfactants adhere to the surface of each vesicle; and (C) the polar oil and/or the silicone oil is present in the bilayer membrane of each vesicle.