Vesicle Membrane Flexibility via Edge-Active Esters for Skin Penetration
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Solution Overview
Problem
Existing carrier systems struggle to form stable and flexible vesicles that can effectively transport both lipophilic and hydrophilic active substances into deeper skin layers, while maintaining skin compatibility and stability.
Innovation Solution
The development of unilamellar vesicles with a continuous membrane formed from food-approved anionic emulsifiers like glyceryl citrate/lactate/oleate and a lipophilic single-chain stabilizer, such as ethyl oleate or ethyl eicosapentaenic acid, which provide a flexible and stable structure for encapsulating active substances, ensuring high encapsulation efficacy and skin penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liposomes or niosomes are used as carrier systems, then encapsulation of active substances is achieved, but penetration into deeper skin layers is insufficient
Solution Approach 1:
The patent changes the physical-chemical parameters of the vesicle membrane by incorporating edge-active substances (alcohols, fatty acids, or their esters) with specific chain lengths and concentrations. This modifies membrane flexibility and fusion properties, enabling deeper skin penetration while maintaining encapsulation efficacy. The parameter optimization includes selecting alcohols with 6-12 carbon atoms or fatty acids with specific unsaturation levels to achieve the desired balance between stability and penetration.
Solution Approach 2:
The invention creates a composite vesicle system combining phospholipids or non-ionic surfactants with edge-active substances (alcohols, fatty acids, or their esters). This composite membrane structure integrates the encapsulation capability of conventional vesicles with the penetration-enhancing properties of edge-active components, achieving both high encapsulation efficacy and deep skin penetration simultaneously.
2Length of moving object
If the amount of ethanol is increased to improve penetration properties, then flexibility and skin penetration are enhanced, but stability of the vesicle suspension deteriorates
Solution Approach 1:
The patent replaces long-term stable ethanol with edge-active substances (fatty acids or their esters) that provide penetration enhancement with better stability profiles. These alternative edge-active components achieve the necessary membrane flexibility for skin penetration without the destabilizing effects of high ethanol concentrations, effectively substituting a short-lived unstable system with a more stable alternative.
Solution Approach 2:
The invention optimizes the concentration and type of edge-active substances to achieve the minimum effective amount for penetration enhancement while maintaining suspension stability. By carefully controlling parameters such as alcohol chain length, fatty acid unsaturation, and ester composition, the system achieves penetration efficacy without exceeding the threshold that would compromise vesicle stability.
3Stability of the object's composition
If phosphatidylcholine content is increased to improve vesicle formation, then membrane stability is enhanced, but flexibility and penetration ability are reduced
Solution Approach 1:
The patent applies local quality modification by incorporating edge-active substances specifically at the membrane edge regions rather than uniformly throughout the membrane structure. This localized incorporation of alcohols, fatty acids, or their esters at the vesicle periphery provides flexibility and penetration ability while maintaining the overall structural stability provided by the phosphatidylcholine or surfactant matrix in the bulk membrane.
Solution Approach 2:
The invention creates a composite membrane system where phosphatidylcholine or non-ionic surfactants form the stable structural backbone, while edge-active substances (alcohols, fatty acids, or esters) are incorporated as functional components. This composite structure combines the stability of high phosphatidylcholine content with the flexibility provided by edge-active agents, resolving the contradiction between membrane stability and penetration ability.
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 vesicles achieve enhanced encapsulation and penetration of active substances into the skin, offering improved stability, skin compatibility, and cosmetic/pharmaceutical effects, including increased skin smoothness and reduced irritation, while allowing for higher concentrations of polyphenols and other active ingredients.
Implementation Method 1
an aqueous core which can comprise at least one cosmetic and/or at least one pharmaceutical active substance and a continuous membrane surrounding the core
Implementation Method 2
able to transport said substances into the deeper skin layers
Implementation Method 3
a continuous membrane surrounding the core, which is formed from at least one emulsifier, selected from the group of the food additives E 472 a to f, and at least one membrane-stabilizing single-chain lipid
Data Source
AI summary
Vesicle, comprising at least the following components: —an aqueous core, which can comprise at least one cosmetic and/or at least one pharmaceutical active substance, and —a continuous membrane which surrounds the core and which is formed by at least one emulsifier, selected from the group of the food additives E 472 a to f, and at least one membrane-stabilizing single-chain lipid and/or one or more lipophilic cosmetic and/or pharmaceutical active substances.