Science
Mechanism of Action
Nisin exerts its antimicrobial action by precisely targeting Lipid II, a critical precursor in bacterial cell wall synthesis. Its N-terminal segment binds to Lipid II, facilitating the insertion of its C-terminal into the bacterial cell membrane, which leads to the formation of pores. This cellular disruption ultimately causes bacterial cell death. At elevated concentrations, Nisin can also interact directly with phospholipids, causing deformities in bacterial cell membranes.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 In a synergistic approach, 0.0125% Nisin, when combined with 0.1% EDTA, 0.15% Imidazolidinyl urea, and 0.35% Phenoxyethanol/Parabens, demonstrated broad-spectrum antimicrobial efficacy against Gram-positive and Gram-negative bacteria, molds, and yeasts in cosmetic emulsions, meeting ISO 11930 standards.
- 02 Used independently, Nisin at 0.1% effectively inhibited Gram-positive bacteria, including Staphylococcus aureus and Bacillus sp., though it showed limited efficacy against Gram-negative bacteria, molds, and yeasts in cosmetic formulations.
- 03 A low concentration of Nisin, 0.0006%, when formulated with 4–6% ethanol, proved effective in preventing biofilm formation.
- 04 In a murine model of excisional skin infection, Nisin significantly reduced Staphylococcus aureus colonization and was associated with accelerated healing.
Transparency
Dusting Analysis
Nisin is primarily utilized for its preservative and antimicrobial properties within formulations rather than as an active ingredient requiring precise "dusting" for a direct skin benefit. Its efficacy is evaluated based on microbial inhibition rather than dose-dependent cosmetic outcomes.
The Formula
Formulation
Stability
Nisin's stability is enhanced in acidic environments, exhibiting robustness at low pH values (e.g., pH 2). Optimal stability for cosmetic applications is generally observed within the pH range of 3-6. Degradation occurs at neutral or alkaline pH. While relatively heat-tolerant, temperatures exceeding 80°C should be avoided during formulation mixing. Long-term stability studies are advised for Nisin-containing products.
Synergies
- Chelating agents (e.g., EDTA)
- Other preservatives (for broad-spectrum antimicrobial activity, especially against Gram-negative bacteria, molds, and yeasts)
Conflicts
- Neutral or alkaline pH environments (causes degradation)
- Heat above 80°C during mixing
Safety
Safety Profile
Nisin holds a Generally Regarded As Safe (GRAS) status from the FDA and is recognized as a food preservative by the Codex Alimentarius and EFSA, which established an Acceptable Daily Intake (ADI) of 0.13 mg nisin/kg bw. For cosmetic use, it is considered mild with a low potential for irritation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Nisin is a valuable natural antimicrobial peptide, offering effective preservation and anti-biofilm benefits across various skin types with low irritation potential, particularly effective when formulated within acidic pH ranges.
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