Science
Mechanism of Action
This ingredient functions by disrupting cellular membranes, a common mode of action for similar cationic antimicrobials like polyhexamethylene biguanide. This membrane damage leads to the irreversible loss of vital cellular components following binding to the cell wall. Its relatively low molecular weight and chemical structure are theorized to facilitate enhanced cellular penetration, contributing to its efficacy.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Studies indicate potent efficacy against a range of pathogens: at 0.005%, it achieved a 3.7 log kill of Pseudomonas aeruginosa within 60 minutes and a 5.4 log kill of Staphylococcus aureus by 45 minutes. Fungi such as Candida albicans and Fusarium solani demonstrated a 5 log kill within 15 minutes at the same concentration.
- 02 Against Acanthamoeba, minimum cysticidal concentrations (MCC) ranged from 0.000625% to 0.0025% (6.25 to 25 μg/mL). A 0.005% concentration resulted in total cyst elimination within 1 to 2 hours. Minimum trophozoite amoebicidal concentration (MTAC) activity against Acanthamoeba trophozoites was observed at approximately 0.00078% (7.8 µg/mL).
Transparency
Dusting Analysis
No data available regarding dusting behavior for this ingredient.
The Formula
Formulation
Stability
While a study on its activity against Acanthamoeba utilized Myristamidopropyl Dimethylamine in a 2 mM Tris-HCl solution at pH 7.2, suggesting stability and activity in this range, explicit optimal pH parameters for cosmetic formulation stability are not provided in the research.
Conflicts
- Improper formulation or the presence of sensitizing impurities, particularly 3,3-dimethylaminopropylamine (DMAPA), poses a significant risk of dermal sensitization.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed Myristamidopropyl Dimethylamine safe for cosmetic use only when formulated to be non-sensitizing, with a strong recommendation for controlling sensitizing impurities like DMAPA. It is specifically considered unsafe for products intended to be left on the skin. While not restricted in the European Union, its GHS classification indicates it 'Causes skin irritation' (H315) and 'Causes serious eye damage' (H318). Its documented use as a biocide in FDA-accepted contact lens solutions suggests specific, controlled applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite potent antimicrobial efficacy at low concentrations, Myristamidopropyl Dimethylamine's classification as unsafe in leave-on skin products and its high potential for irritation and sensitization, primarily due to impurities, renders it unsuitable for precision skincare applications.
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