Antimicrobial Phospholipid Complexes for Scalp Substantivity
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Solution Overview
Problem
Current antidandruff agents are not sufficiently substantive to the scalp and hair, often separate in aqueous shampoos due to density mismatch, leading to instability and reduced efficacy, and many have cytotoxic potential or cause irritation, with limited effectiveness against Malassezia yeasts and instability at natural scalp pH.
Innovation Solution
Development of water-soluble synthetic phospholipids with two undecylenic acid moieties and their synergistic combinations with sophorolipids, which are cosmetically compatible, stable at natural pH, and provide broad-spectrum antimicrobial activity, enhancing substantivity and reducing irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-insoluble particulate antidandruff agents are used, then antimicrobial activity against Malassezia yeasts is achieved, but the agents separate from aqueous shampoo base due to density mismatch, leading to compositional instability
Solution Approach 1:
The patent changes the solubility parameter of the antidandruff agent by using water-soluble phospholipid complexes containing undecylenic acid and zinc pyrithione. This allows the active ingredients to remain dissolved in the aqueous shampoo base, eliminating separation issues while maintaining antimicrobial efficacy against Malassezia yeasts.
Solution Approach 2:
The patent creates a composite water-soluble phospholipid complex that combines multiple functional components: phospholipids as the carrier matrix, undecylenic acid for antifungal activity, and zinc pyrithione for enhanced antimicrobial effect. This composite structure provides both stability in aqueous media and reliable antimicrobial action.
2Reliability
If water-insoluble particulate antidandruff agents are used, then antimicrobial activity is achieved, but the agents aggregate in aqueous cosmetic products, decreasing available surface area and resulting in loss of antidandruff activity
Solution Approach 1:
The patent changes the physical state parameter of the antidandruff agent from particulate solid to water-soluble molecular complex. The phospholipid-based soluble complexes maintain individual molecules dispersed in the aqueous phase, preventing aggregation and maximizing the available surface area for antimicrobial action.
3Reliability
If conventional antidandruff actives are used at higher concentrations to achieve better dandruff reduction, then antimicrobial efficacy is improved, but cytotoxic potential and skin irritation increase
Solution Approach 1:
The patent changes the chemical nature of the active agent by using biocompatible phospholipid complexes that mimic natural skin lipids. This allows effective antimicrobial activity against Malassezia at lower concentrations without the cytotoxic effects associated with conventional synthetic antifungals, as the phospholipid structure is inherently gentle on skin cells.
Solution Approach 2:
The phospholipid complex acts as an intermediary carrier that delivers the antimicrobial active ingredients (undecylenic acid and zinc pyrithione) to the target Malassezia yeasts while protecting skin cells from direct contact with potentially cytotoxic substances. The phospholipid membrane structure provides selective permeability.
4Duration of action of stationary object
If antidandruff actives are made substantive to extend efficacy from one shampoo treatment to the next, then long-term effectiveness is achieved, but the actives may not be compatible with cosmetic ingredients and difficult to formulate
Solution Approach 1:
The phospholipid complex structure provides multi-functionality: it serves as the antimicrobial active delivery system, provides substantivity to hair and scalp through phospholipid binding, maintains compatibility with cosmetic ingredients due to its natural lipid structure, and ensures stability in aqueous formulations. This single molecular structure accomplishes multiple functions simultaneously.
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 compounds demonstrate greater than 99.9% killing of Malassezia furfur within five minutes, are stable and effective at natural scalp pH, non-irritant, and maintain long-term substantivity, offering superior antidandruff activity and compatibility with cosmetic ingredients.
Implementation Method 1
The compounds demonstrate greater than 99.9% killing of Malassezia furfur within five minutes
Implementation Method 2
synthetic phospholipids which can be used as an antifungal agent
Implementation Method 3
stable and effective at natural pH of the scalp or skin (i.e., pH 4.0-5.0)
Implementation Method 4
highly substantive, scalp & skin compatible
Implementation Method 5
maintain long-term substantivity
Implementation Method 6
synergistic combinations of phospholipids of formula I with sophorolipids of formula II
Implementation Method 7
broad-spectrum antimicrobial activity
Data Source
AI summary
A synergistic antimicrobial composition for use in personal care products functions as an antifungal agent in hair shampoo and hair care products, and includes (A) an undecylenic acid based phosphobetaine depicted by Formula I, where R=Undecylenic acid:and (B) a sophorolipid, a biosurfactant produced by a fermentation process using Candida bombicola, having a structure as depicted by Formula II(A), Formula II(B), or a mixture thereof: