Personal Wash Stabilizing Microbiome via pH and Surfactant Control
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Solution Overview
Problem
Current personal hygiene products for feminine intimate areas often cause skin irritation and dryness, fail to maintain the natural pH balance, and provide inadequate antibacterial protection while potentially disrupting the vaginal microbiome.
Innovation Solution
A personal wash composition containing betaine surfactant, lactic acid, polyhydric C2-C6 alcohol, alkyl polyethoxy carboxylate, alkyl polyethoxy amides, alkyl ether sulfate, and a specific pH range of 3.8-4.5, which provides gentle cleansing, antimicrobial action, and skin moisturization without disrupting the natural skin flora.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If harsh antiseptics and high pH soaps are used to deliver strong antibacterial action, then germ kill effectiveness is improved, but skin irritation and dryness increase, and the natural vulvovaginal microbiome balance is disrupted
Solution Approach 1:
The patent changes the pH parameter from high pH (harsh soaps) to low pH (3.8-4.5) to match the natural vulvovaginal environment, and adjusts the surfactant system to use milder ingredients like betaine surfactants and alkyl polyethoxy carboxylates. This parameter change maintains antibacterial effectiveness while reducing skin irritation and preserving the natural microbiome balance.
Solution Approach 2:
The patent uses a composite surfactant system combining multiple mild surfactants (betaine surfactant, alkyl polyethoxy carboxylate, alkyl ether sulfate) with lactic acid and polyhydric alcohols. This composite formulation provides synergistic antibacterial action while maintaining skin compatibility and moisturization, avoiding the need for harsh single-ingredient antiseptics.
2Object-affected harmful factors
If mild surfactants and low pH formulations are used to maintain skin balance and moisturization, then skin compatibility is improved, but antibacterial effectiveness is reduced
Solution Approach 1:
The patent optimizes the pH parameter to the specific range of 3.8-4.5, which is acidic enough to inhibit pathogenic bacteria while being compatible with the natural vulvovaginal environment. This parameter optimization allows mild surfactants to maintain both skin compatibility and effective antibacterial action against common pathogens.
Solution Approach 2:
The patent applies different functional components in specific concentrations: betaine surfactant (0.1-10 wt%), lactic acid (0.1-5.0 wt%), and alkyl polyethoxy carboxylate (0-10 wt%). Each ingredient is positioned at optimal local concentration to provide its specific function - cleansing, acidification, and antimicrobial action - while maintaining overall formulation harmony and skin compatibility.
3Reliability
If internal washing or douching is performed to clean the vaginal area, then hygiene is improved, but the natural vaginal flora and pH balance are disrupted, leading to potential infections
Solution Approach 1:
Instead of using internal washing or douching that rinses away natural protective flora, the patent inverts the approach by using external washes formulated with lactic acid and low pH that actively restore and maintain the natural acidic environment. This inverted approach protects rather than removes the beneficial microbiome while still providing hygiene benefits.
Solution Approach 2:
The patent enables the vulvovaginal area to maintain its own natural defense mechanisms by formulating the wash to support the existing acidic pH and lactobacillus population. The lactic acid in the formulation complements the body's natural lactic acid production, allowing the system to self-regulate and maintain its protective barrier without disrupting the natural flora.
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 effectively reduces undesired microorganisms, maintains skin health, and stabilizes the vaginal microbiome, offering protection against infections and skin dryness while being clinically proven to be mild and non-irritating.
Implementation Method 1
lactic acid, resulting in an acidic environment (pH 3-4)... The normal vaginal flora, acidic vaginal pH... are all components of the innate defense mechanisms that protect against vulvovaginal infections
Implementation Method 2
a) from 0.1 wt % to 10 wt % betaine surfactant... e) from 0 wt % to 10 wt % alkyl polyethoxy amides... f) >8 wt % alkyl ether sulphate
Implementation Method 3
from 0.1 wt % to 20 wt % polyhydric C2-C6 alcohol... provides mild cleansing to the skin including protection of the commensal microflora of the skin
Data Source
AI summary
A personal wash composition which provides an effective antimicrobial benefit against fungi, gram positive and gram negative bacteria, which composition comprises: a) from 0.1% to 10 wt % betaine surfactant, b) from 0.1% to 5.0 wt % lactic acid, c) from 0.1% to 20 wt % polyhydric C2-C6 alcohol, d) from 0% to 10 wt % alkyl polyethoxy carboxylate of the formula RO(CH2CH2O)kCH2COO−M+ wherein R is a C8-C22 alkyl, k is an integer from 0 to 20, and M is a soluble salt-forming cation, e) from 0% to 10 wt % alkyl polyethoxy amides of the formula RO(CH2CH2O)kCH2CONH2 wherein R is a C8-C22 alkyl, k is an integer from 0 to 20, f) >8 wt % alkyl ether sulphate, g) water, h) a pH of 3.8-4.5, i) 10-20 wt % total surfactant, j) from 0.1 to 10 wt % metal salt.