Nanoemulsion Composition for Color-Stable Skin Actives
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Solution Overview
Problem
Existing skin benefit compositions with actives like retinoic acid precursors and resorcinols suffer from instability, leading to formulation discoloration and consumer dissatisfaction due to perceived loss of efficacy.
Innovation Solution
A nanoemulsion comprising at least 30% by weight oil, with actives like retinoic acid precursors and resorcinols, stabilized by a water continuous system, which prevents degradation from heat, oxygen, and UV light, maintaining color stability and reducing skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actives like retinoic acid precursors and resorcinols are used in skin benefit compositions, then skin benefits are provided, but formulation discoloration occurs due to active instability
Solution Approach 1:
The patent creates an oxygen-excluded environment within the nanoemulsion structure, effectively isolating the active ingredients from oxidative degradation. The oil phase and surfactant matrix form a protective barrier that prevents oxygen contact, thereby preventing discoloration while maintaining active stability and efficacy.
Solution Approach 2:
The nanoemulsion structure employs a surfactant-based interfacial film surrounding the oil core containing the active ingredients. This thin film structure provides physical protection and stabilizes the active against environmental factors including oxygen and light, preventing degradation and discoloration.
2Ease of operation
If conventional emulsions are used to deliver actives, then skin benefits are achieved, but premature discoloration occurs reducing consumer satisfaction
Solution Approach 1:
The patent divides the emulsion into nano-scale droplets (50-500 nm) rather than conventional larger droplets. This segmentation increases the surface area to volume ratio and creates a more stable dispersion that resists aggregation and degradation, maintaining color stability while effectively delivering skin benefits.
Solution Approach 2:
The invention creates a composite nanoemulsion system combining oil phase, water phase, and surfactant components in a specific architecture. This composite structure provides enhanced stability compared to simple emulsions, preventing premature discoloration while maintaining skin benefit delivery capabilities.
3Duration of action of stationary object
If actives are exposed to heat, oxygen, or ultraviolet light, then formulation processing and storage occur, but active degradation leads to discoloration
Solution Approach 1:
The nanoemulsion structure creates an oxygen-excluded microenvironment that protects actives from oxidative degradation during storage and processing. This protective barrier maintains active efficacy throughout the product shelf life by preventing exposure to degrading factors.
Solution Approach 2:
The patent incorporates stabilizing components and protective structures in advance within the nanoemulsion formulation. The surfactant matrix and oil phase are pre-configured to cushion and protect the active ingredients from heat, oxygen, and UV light exposure before degradation can occur, ensuring long-term stability and efficacy.
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 nanoemulsion effectively stabilizes actives, reducing color change by 10% or less over 8 weeks at 45°C, ensuring product efficacy and consumer satisfaction.
Implementation Method 1
The nanoemulsion comprises at least 30% by weight oil, and surprisingly, improves color stability of end use compositions they are formulated in by preventing degradation of active resulting from active exposure to heat, oxygen, ultraviolet light or the like.
Data Source
AI summary
Nanoemulsions as emulsion additives are prepared to stabilize actives and prevent formulation discoloration. The nanoemulsions have at least 30% by weight oil and are suitable to add to emulsions and/or structured water to produce color stable end use skin benefit compositions.