Piroctone Olamine Stability in Hair Care via Polyaspartate Complexation
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Solution Overview
Problem
The efficacy of piroctone olamine in hair care compositions is reduced due to its reaction with metal salts, which are introduced during manufacturing, tap water, and sweat, leading to decreased bioavailability and stability of the antidandruff agent.
Innovation Solution
A hair care composition comprising piroctone olamine, a polyaspartate or its derivative, and a specific surfactant system, where the weight ratio of polyaspartate to piroctone olamine is at least 2:3, improving the stability and bioactivity of piroctone olamine by forming a complex that enhances deposition on the scalp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piroctone olamine is applied topically to treat dandruff, then dandruff treatment efficacy is achieved, but metal salts reduce the bioavailability and stability of piroctone olamine
Solution Approach 1:
The patent introduces a metal chelating agent as an intermediary substance that binds to metal salts, preventing them from reacting with piroctone olamine. This mediator protects the active ingredient from degradation while maintaining its antifungal efficacy against Malassezia yeasts.
Solution Approach 2:
The patent converts the harmful reaction between metal salts and piroctone olamine into a beneficial complex formation. By allowing controlled complexation with specific metals under optimized conditions, the formulation maintains stability while preserving bioavailability, turning a detrimental interaction into a useful mechanism for controlled delivery.
2Ease of manufacture
If metal salts are present in the formulation or environment, then manufacturing and application become simpler, but the bioavailability of piroctone olamine decreases
Solution Approach 1:
The patent applies preliminary protection by incorporating a metal chelating agent into the formulation before application. This pre-established protective mechanism ensures that when the product is applied to the scalp, the piroctone olamine is already protected from metal salt interactions, maintaining high bioavailability without requiring complex post-application measures.
3Stability of the object's composition
If the composition includes additional ingredients like polyaspartate and surfactants, then stability and deposition are improved, but the formulation becomes more complex
Solution Approach 1:
The patent employs polyaspartate as a multi-functional ingredient that simultaneously serves as a stabilizing agent, a deposition enhancer, and a mild chelating agent. The surfactant system performs multiple roles including cleansing, emulsification, and facilitating even distribution of the active ingredient. This multi-functionality reduces the need for additional specialized ingredients, managing formulation complexity while achieving multiple benefits.
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 significantly improves the stability and bioavailability of piroctone olamine, maintaining its effectiveness even in the presence of metal salts, thereby providing enhanced dandruff treatment efficacy.
Implementation Method 1
stability of piroctone olamine can be improved if piroctone olamine, a polyaspartate or its derivative and a specific surfactant system are co-formulated into a composition
Implementation Method 2
a polyaspartate or its derivative and a specific surfactant system are co-formulated into a composition
Data Source
AI summary
Disclosed is a hair care composition comprising a (i) an anionic surfactant; (ii) an amphoteric or zwitterionic surfactant; (iii) piroctone olamine; iv) a polyaspartate or its derivative presented by the structure of formula (1), where the sum of m+n is from 2 to 10000, R1, R2 are independently selected from the group consisting of H, OH, (O)mG, m is 0 or 1, G is independently selected from the group consisting of H and a substituted or unsubstituted C1-C12 organic group, M1, M2 are independently selected from the group consisting of H, metal salt or ammonium salt, wherein non-limiting examples of the metal salts include Na, K, Ca, Mg, Al salts; and v) a cosmetically acceptable carrier; wherein the weight ratio of said polyaspartate or its derivative to said piroctone olamine in the composition is at least 2:3. It has been shown to improve the stability of the piroctone olamine.