Science
Mechanism of Action
This ingredient operates as a cationic surfactant that targets microbial cell structures. It penetrates the cell wall of microorganisms, subsequently adsorbing to their negatively charged cytoplasmic membrane. This interaction disrupts the membrane's integrity, leading to its deformation and the leakage of vital cytoplasmic material. Consequently, cell viability is compromised, metabolic processes are inhibited, and microbial growth is effectively prevented.
Research
Clinical Evidence
High confidence0.05%
Key findings
- 01 Exhibits strong broad-spectrum antimicrobial activity against bacteria, yeasts, and molds, as determined by Minimum Inhibitory Concentrations (MICs).
- 02 Effectively provides an antiseptic and preservative effect within cosmetic formulations.
- 03 Serves as the maximum permissible concentration for a general preservative in all cosmetic products within EU regulations. It also functions as an antistatic agent and surfactant.
- 04 Approved as the maximum concentration for antimicrobial applications in specific products such as soaps, anti-plaque oral care products, deodorants, and anti-dandruff shampoos under SCCS/EU guidelines.
Transparency
Dusting Analysis
Ethyl Lauroyl Arginate HCl is a functional ingredient primarily utilized for its potent preservative and antimicrobial properties at specific, effective concentrations. It is not typically 'dusted' at sub-efficacious levels, as its primary benefits are dose-dependent and crucial for product stability and safety.
The Formula
Formulation
Stability
This ingredient demonstrates optimal stability within a pH range of 3.0 to 8.0, making it compatible with a wide array of cosmetic formulations. However, its stability is compromised in alkaline conditions, with hydrolysis accelerating significantly at higher pH levels (e.g., a half-life of 34 hours at pH 9 compared to over 1 year at pH 4 at 25°C). Stability also decreases with increased temperature and reduced pH in aqueous solutions. It is soluble up to 20% in propylene glycol, glycerin, and ethanol. To maintain activity, prolonged exposure to high temperatures (above 80°C for more than 30 minutes) should be avoided during manufacturing; integration into the formulation during the cooling phase (below 50°C) is recommended.
Conflicts
- Anionic surfactants (e.g., Sodium Lauryl Sulfate, Sodium Laureth Sulfate) may induce precipitation, necessitating careful staged addition or formulation sequence adjustments.
- Strong oxidizing or reducing agents (e.g., high concentrations of Vitamin C, hydrogen peroxide) have the potential to diminish its activity.
Safety
Safety Profile
Generally considered mild and non-sensitizing for the skin at effective concentrations. However, acute eye irritation tests classify it as a severe eye irritant, and higher concentrations may cause mild skin irritation. The SCCS has deemed it safe for use in mouthwashes at concentrations up to 0.15%. It holds FDA approval for food preservation and 'on-demand use' in cosmetics, and is GRAS (Generally Recognized As Safe) for certain food applications up to 200 ppm. In China, its use in cosmetics is limited to a maximum of 0.4%. Toxicological data indicates low oral toxicity (LD50 rat oral >2000 mg/kg) and it is non-mutagenic (negative Ames test). It is also biodegradable.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Ethyl Lauroyl Arginate HCl is a highly valuable ingredient due to its potent broad-spectrum antimicrobial activity, making it an effective preservative for a wide range of cosmetic products, alongside its reported skin and hair conditioning benefits and favorable safety profile at effective concentrations.
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References
Sources