L-Ascorbic Acid Topical Formulation Stability
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Solution Overview
Problem
Current topical Vitamin C formulations are unstable, especially in water-based solutions, leading to rapid oxidation and degradation, and often contain lower concentrations than needed for effective skin brightening and anti-aging benefits, with existing methods failing to maintain high concentrations without significant degradation or side effects.
Innovation Solution
Developing high-potency topical formulations of L-ascorbic acid dissolved in a combination of a urea agent and a non-aqueous skin-compatible solvent, such as 1,3-propanediol, which stabilizes Vitamin C at concentrations up to 28% and maintains its biological activity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water-based formulations are used to dissolve Vitamin C, then solubility is improved, but stability deteriorates due to rapid oxidation
Solution Approach 1:
The patent changes the fundamental parameter of the solvent system from aqueous to non-aqueous (anhydrous). By eliminating water from the formulation and using alternative solvents such as polyols (propylene glycol, glycerine), the patent resolves the oxidation stability issue while maintaining Vitamin C solubility through these alternative liquid carriers.
2Quantity of substance
If higher concentrations of Vitamin C are used for effective skin brightening, then efficacy is improved, but stability deteriorates leading to rapid degradation
Solution Approach 1:
The patent changes the solvent system parameter from water-based to non-aqueous, enabling the formulation of high concentrations of Vitamin C (10-28% w/w) without rapid oxidation. The anhydrous polyol-based solvent system maintains stability even at these elevated concentrations.
Solution Approach 2:
The patent creates a composite formulation system combining Vitamin C with specific non-aqueous solvents (polyols) and optional stabilizing agents. This composite approach allows high concentrations of the unstable Vitamin C to be maintained stably through the protective non-aqueous environment and synergistic effects of the formulation components.
3Stability of the object's composition
If water is eliminated from the formulation to improve stability, then oxidation resistance is improved, but solubility of Vitamin C deteriorates
Solution Approach 1:
The patent introduces non-aqueous solvents (polyols such as propylene glycol and glycerine) as intermediary substances that mediate between the need for water elimination and the need for Vitamin C solubility. These intermediaries provide a liquid medium that dissolves Vitamin C while lacking the oxidative properties of water.
4Quantity of substance
If conventional solvents are used to dissolve high concentrations of Vitamin C, then concentration is improved, but stability deteriorates due to degradation
Solution Approach 1:
The patent changes the chemical environment parameter by switching from aqueous to non-aqueous solvent systems. This parameter change fundamentally alters the stability profile, allowing high concentrations of Vitamin C to be maintained reliably over time without the degradation pathways active in water-based systems.
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 formulations provide extended storage stability and effective delivery of high Vitamin C concentrations, reducing skin aging signs like fine lines, wrinkles, and dyschromia without significant degradation or side effects, making them suitable for treating various dermatocosmetic conditions.
Implementation Method 1
Topical formulations of L-ascorbic acid dissolved in a combination of a urea agent and a non-aqueous skin-compatible solvent
Implementation Method 2
water-based formulations containing ascorbic acid are typically not stable. Although ascorbic acid is readily soluble in water, rapid oxidation occurs in aqueous media
Data Source
AI summary
Topical formulations of L-ascorbic acid dissolved in a combination of a urea agent and a non-aqueous skin-compatible solvent are provided. The formulations are storage stable for an extended period of time without significant degradation of the L-ascorbic acid in the composition, are have desirable physical properties. The topical formulations can include high concentrations of the L-ascorbic acid. Topical compositions of this disclosure find use in treating or preventing a variety of cosmetic and/or dermatological conditions as well as to reduce the appearance of chronological and/or environmentally-caused skin aging.